OVRTAPF (Override with Tape File)

OVRTAPF Command syntax diagram

 

Purpose

The Override with Tape File (OVRTAPF) command is used to (1) override/replace a file named in a program, (2) override certain attributes of a file that is used by a program, or (3) override the file named in a program and override certain attributes of the file processed.

Parameters overridden by this command are specified in the file description, in the program, or in other called file override commands. If a file named in the program is overridden, the name of that file is specified in the FILE parameter and the name of the overriding file is specified in the TOFILE parameter. The OVRTAPF command can also specify parameters to override values contained in the file description of the overriding file. If the file named in the program is not replaced, but certain parameters of the file are overridden, the name of the file is specified in the FILE parameter and *FILE is specified in the TOFILE parameter. The parameters overridden are then specified by the other parameters of the OVRTAPF command. Parameters that are not specified do not affect the parameters specified in the file description, in the program, or in other called file override commands.

More information on overriding files is in the File Management topic in the Information Center and the Tape and Diskette Device Programming book.

 

Required Parameters

FILE

Specifies the name of the file being used by the program to which this override command is applied. If TOFILE(*FILE) is specified, a display device file must be specified. Otherwise, any device file or database file can be specified.

TOFILE

Specifies the qualified name of the tape device file that is used instead of the file specified in the FILE parameter, or if *FILE is specified, specifies that certain attributes are overridden by parameters specified in this command. The parameters specified on this OVRTAPF command override the other values specified in the tape device file or in the program.

*FILE: The tape device file named in the FILE parameter has some of its parameters overridden by values specified in this command.

The name of the tape device file can be qualified by one of the following library values:

*LIBL: All libraries in the job's library list are searched until the first match is found.

*CURLIB: The current library for the job is searched. If no library is specified as the current library for the job, the QGPL library is used.

library-name: Specify the name of the library to be searched.

tape-device-file-name: Specify the qualified name of the Tape device file that is used instead of the overridden file.

DEV

Specifies the names of one or more tape devices or one media library device used with this tape device file to perform input and output data operations. A media library device is a tape storage device that contains one or more tape drives, tape cartridges, and a part (carriage and picker assembly) for moving tape media between the cartridge storage slots and the tape drives. The device names in the OVRTAPF command (up to four) override the device names specified in the program or in the tape device file.

device-name: Specify the names of one or more devices (no more than four) or the name of one media library device used with this tape device file. The order in which the device names are specified is the order in which tapes on the devices are processed. When more volumes are processed than the number of devices in the DEV list, the devices are used in the same order specified, wrapping around to the first device as needed. Each device name must be known on the system by a device description before this device file is created.

VOL

Specifies one or more volume identifiers used by the file. The volumes must be installed in the same order as the identifiers are specified here (and as they are specified on the DEV parameter). If the file is opened for read backward, then the volume identifiers in the list are processed from last to first (while the devices in the device list are used in first-to-last order). If a list of volume identifiers is provided for the file, operator messages indicate the name of the required volume. More information on this parameter is in Commonly used parameters.

This parameter overrides the volume identifiers specified in the tape device file.

*NONE: No tape volume identifiers are specified for this file. They can be supplied before the device file is opened, either in a CHGTAPF or OVRTAPF command or in the high-level language program. If volume identifiers are not specified before the device file is opened, volume checking is not performed beyond verifying that the correct label type volume is on the device, and volume names are not provided in operator messages. The maximum number of reels processed for an *NL, *NS, *BLP, or *LTM input file when VOL(*NONE) is specified is determined by the REELS(number-of-reels) parameter value.

volume-identifier: Specify the identifiers of one or more volumes in the order in which they are placed on the device. Each volume identifier contains a maximum of 6 alphanumeric characters. Use a blank as a separator character when listing multiple identifiers. Up to 50 volume identifiers can be specified. These identifiers are used in messages sent to the operator during processing. The maximum number of reels processed for an *NL, *NS, *BLP, or *LTM input file is determined by the number of volume identifiers in the list.

Note:

If the VOL parameter value used for the file specifies a list of identifiers rather than VOL(*NONE), the number-of-reels part of the REELS parameter is ignored regardless of where it is specified. A description of how the parameter values for the file are determined when overrides are used, the high-level language interface, and the device file when the file is opened is in the File Management topic in the Information Center. To ensure that the number-of-reels part of the REELS parameter is used (rather than a VOL identifier list) to control the volumes processed by the tape device file, specify VOL(*NONE) in the same command in which the REELS parameter is specified.

REELS

Specifies the type of labeling used on the tape reels and the maximum number of reels processed if both a list of volume identifiers is not specified (VOL parameter) and this device file is used with either *NL, *NS, *LTM, or *BLP input files. When the number of reels is specified as the second element of this parameter, the volume identifiers on the volumes are ignored if labeled tapes are being processed; instead, the order in which the reels are installed on the device must be checked by the operator.

The number-of-reels value is not a limiting value for standard-label or output files. For a standard-label input file, the data file labels limit the number of volumes processed by indicating end-of-file. For an output file, the number-of-reels value is ignored; the system requests that additional volumes be kept on the device until the file is closed.

The system checks the first record following the load point on the tape to see (1) whether it has exactly 80 bytes for EBCDIC or at least 80 bytes for ASCII and (2) whether the first 4 bytes contain the values VOL and 1. If so, the reel contains a standard-label tape. *SL and *BLP files require standard-label tape volumes. *NL, *NS, and *LTM tape files cannot process standard-label volumes.

Note:

The values *SL, *NL, and *LTM can be specified if the device file is used for either reading or writing on tapes. The values *NS and *BLP are valid only if the device file is used to read tapes.

This parameter overrides the values specified in the device file, in the program, or in other called OVRTAPF commands.

*SL: The volumes have standard labels. If a list of volume identifiers is specified (with the VOL parameter), the system checks that the correct tape volumes are on the device in the specified sequence.

• If no volume identifier list is given and the file is opened for output, any standard-label volumes may be installed on the device.
  
  
• If no volume identifier list is given and the file is opened for input, the first volume may have any volume identifier, but if the file is continued, the system requires the correct continuation volumes to be processed (verified by checking the data file labels). For an input file, the end-of-file message is sent to the program being used when the labels on the last volume processed indicate that it is the last volume for the data file.

*NL: The volumes are not labeled. On a nonlabeled volume, tape marks are used to indicate the end of each data file and the end of the volume. For an input file, the end-of-file message is sent to the program when the number of volumes specified in the volume list have been processed, or, if no list of volume identifiers is provided, when the number of reels specified in the REELS parameter are processed.

*NS: The volumes have nonstandard labels. Each volume must start with some kind of label information, optionally preceded by a tape marker and always followed by a tape marker. This nonstandard label information is ignored. The system spaces forward to a point beyond the tape marker that follows the nonstandard labels and positions the tape at the file's data. Each reel must have a tape marker at the end of the file's data. Information beyond this ending tape marker is ignored. Only a single data file can exist on a nonstandard tape. Standard-label volumes cannot be processed by using the *NS label processing.

For an input file, the end-of-file message is sent to the program using the file when the number of volumes specified in the volume list have been processed, or, if no list of volume identifiers is provided, when the number of reels specified in the REELS parameter are processed.

*BLP: Standard-label processing is bypassed. Each reel must have standard labels. Although each reel is checked for a standard volume label and each file must have at least one standard header label (HDR1) and one standard trailer label (EOV1 or EOF1), most other label information (such as the data file record length or block length) is ignored. The sequence number of each file on the volume is determined only by the number of tape markers between it and the start of tape (in contrast to *SL processing in which the file sequence number stored in the header and trailer labels of each file are used to locate a data file).

Most of the information in the data file trailer label is ignored, but if an end-of-file (EOF) trailer label is found, the end-of-file message is sent to the program using the tape file. If no end-of-file trailer label is encountered by the time the specified number of volumes or reels have been processed (volume identifier list and REELS parameter), the end-of-file message is immediately sent to the program using the tape file. Bypass label processing can be used when the user does not know the name of the file used or when some file label information is incorrect.

*LTM: The volumes have no labels but do have a single leading tape marker before the first data file. REELS(*LTM) is processed the same as REELS(*NL) except that when SEQNBR(1) is specified for an output file to create the first data file on the tape, a leading tape marker is written at the start of the tape before the first data block.

number-of-reels: Specify the maximum number of reels to be processed for an *NL, *LTM, *NS, or *BLP input tape operation when a list of volume identifiers is not specified (VOL parameter). If the next reel is not on the device when the end of the currently-processing tape is reached, a message is sent to the operator requesting that the next tape be installed on the next tape device. The number-of-reels value is ignored for a standard-label (*SL) file or for any output file.

SEQNBR

Specifies the sequence number of the data file on the tape being processed.

• When standard-label tapes are used, the four-position file sequence number is read from the first header label of the data file.
  
  
• When bypass label processing is used or when standard-label tapes are not used, the system counts the tape markers from the start of the tape to locate the correct sequence number data file to be processed.
  
  
• When multiple-file, multiple-volume tapes are processed using REELS(*SL), the file sequence numbers continue consecutively through the volumes; thus, each new data file has a sequence number one greater than the previous file, regardless of its volume location.

*END: The file is written on the end of the tape. This value is used only for files that are written to tape.

An error message is shown on the display when a tape device file is used to read from a tape and the *END special value is specified in the tape device file.

*NEXT: The next file in the sequence is processed. This value is used for files read from tape. If the tape is currently in a position that is prior to the first file, the first file on the tape is processed.

An error message is shown on the display when a tape file is used to write to a tape and the *NEXT special value is specified in the tape file.

sequence-number: Specify the sequence number of the file. Valid values range from 1 through 16777215.

LABEL

Specifies the data file identifier of the data file processed by this tape device file. An identifier is defined only for standard-label tapes and is stored in the header label immediately before the data file.

If a data file identifier is specified for any type of label processing other than *SL, it is ignored.

An identifier is required for a standard label output file, but is optional for an input file because the sequence number uniquely identifies the data file to process.

For an input file or output file with EXTEND(*YES) specified, this parameter specifies the identifier of the data file on the tape. The specified identifier must match the one in the labels of the data file that the SEQNBR parameter specifies; otherwise, an error message is sent to the program using this device file. For output files with EXTEND(*NO) specified, this parameter specifies the identifier of the data file to be created on the tape. More information on this parameter is in .

This parameter overrides the data file identifier specified in the device file, in the program, or in other called OVRTAPF commands.

data-file-identifier: Specify the identifier (17 alphanumeric characters maximum) of the data file used with this tape device file. If this identifier is for a tape written in the basic exchange format, and is used on a system other than an iSeries 400, up to eight characters or a qualified identifier having no more than eight characters per qualifier must be used.

RCDLEN

Specifies, in bytes, the length of the records contained in the data file processed with this device file. The system always uses the record length and block length specified in the data file labels for any standard-label input file or output file with EXTEND(*YES) specified (if a second header label (HDR2) is found on the tape and *BLP label processing has not been specified).

This parameter overrides the value specified in the device file, in the program, or in other called OVRTAPF commands.

*CALC: No record length is specified for the data file being processed. If *CALC is specified, the system will attempt to calculate an appropriate record length when the file is opened. RCDLEN(*CALC) can be used for nonlabeled tapes or when there is no HDR2 label if a BLKLEN value other than *CALC is specified for the file and RCDBLKFMT does not specify spanned or blocked records. In this case, the system calculates an appropriate record length from the block length, record block format, and buffer offset (for an ASCII file) specified for the file. In any other case, the actual record length must be specified by a CHGTAPF command or OVRTAPF command, or in the high-level language program that opens the device file.

record-length: Specify a value ranging from 1 through 32767 bytes that indicates the length of each record in the data file. The minimum and maximum record length allowed for a file is dependent on the record block format, block length, buffer offset (for an ASCII file), and recording code. The EBCDIC Record Length Values and ASCII Record Length Values tables (at the end of this parameter description) show the minimum and maximum record length values allowed for each record block format, assuming the block length value is large enough to support the maximum record length. The following EBCDIC Record Length Values and ASCII Record Length Values tables show the minimum and maximum record length values allowed for each record block format, assuming the block length value is large enough to support the maximum record length.

Figure 1. EBCDIC Record Length Vlaues (RCDLEN Parameter)

RCDFBLKFMT	EBCDIC RCDLEN Ranges
	FILETYPE(*DATA)	FILETYPE(*SRC)
*F *FB *U	18 - 32767	30 - 32767
*V *VB	1 - 32759	13 - 32767
*VS *VBS	1 - 32759	13 - 32767

RCDFBLKFMT	ASCII RCDLEN Ranges
	FILETYPE(*DATA)	FILETYPE(*SRC)
*F *FB *U	18 - 32767	30 - 32767
*D *DB	1 -  9995	13 - 10007
*VS *VBS	1 - 32759	13 - 32767

Figure 2. ASCII Record Length Vlaues (RCDLEN Parameter)

RCDFBLKFMT	ASCII RCDLEN Ranges
	FILETYPE(*DATA)	FILETYPE(*SRC)
*F *FB *U	18 - 32767	30 - 32767
*D *DB	1 -  9995	13 - 10007
*VS *VBS	1 - 32759	13 - 32767

BLKLEN

Specifies, in bytes, the maximum length of the data blocks transferred to or from the tape for output or input operations. The system uses the block length and record length specified in the data file labels for any standard-label input file or output file with EXTEND(*YES) specified (if a second header label (HDR2) is found on the tape and *BLP label processing has not been specified).

This parameter overrides the value specified in the device file, in the program, or in other OVRTAPF commands.

*CALC: No block length is specified for the data file to be processed. If *CALC is specified, the system attempts to calculate an appropriate block length when the file is opened. BLKLEN(*CALC) can be used for nonlabeled tapes or when there is no HDR2 label if a RCDLEN value other than *CALC is specified for the file and RCDBLKFMT does not specify spanned or blocked records. In this case, the system calculates an appropriate block length from the record length, record block format, and buffer offset (for an ASCII file) specified for the file. In any other case, the actual block length must be specified by a CHGTAPF command or OVRTAPF command, or in the high-level language program that opens the device file.

block-length: Specify a value, not exceeding 524288 bytes, that specifies the maximum length of each block in the data file to be processed. The minimum block length that can be successfully processed is determined by the tape device hardware and iSeries 400 machine support functions.

• The maximum block length is always 524288 bytes for an input file, but is limited to 9999 bytes if block descriptors must be created for an ASCII output file.
  
• The following table shows the minimum and maximum block length values allowed for an output file:

CODE	BUFOFSET	Minimum BLKLEN	Maximum BLKLEN
*EBCDIC	Ignored	18	524288
*ASCII	0	18	524288
*ASCII	*BLKDSC	18	9999

BUFOFSET

Specifies the buffer offset value for the start of the first record in each block in the tape data file. A buffer offset value can be used for any record block format ASCII file, and is ignored for an EBCDIC tape file. The system uses the buffer offset specified in the data file labels for any standard-label input file or output file with EXTEND(*YES) specified if a value is contained in the second header label (HDR2) on the tape, and *BLP label processing has not been specified.

The buffer offset parameter specifies the length of any information that precedes the first record in the block. For record block formats *D, *DB, *VS, and *VBS, each record or record segment is preceded by a descriptor that contains the length of the record or segment. A buffer offset value is used to indicate that there is information ahead of the descriptor word for the first record in each block, or ahead of the data of the first fixed-length record or undefined format record in each block.

This parameter is not needed for a standard-label file processed for input if the tape includes a second file header label (HDR2) that contains the buffer offset value. A buffer offset value must be provided by the Create Tape File (CRTTAPF) command, Change Tape File (CHGTAPF) command, or Override Tape File (OVRTAPF) command, or by the file labels for an input file that contains any information (such as a block descriptor) ahead of the first record in each block. If the user does not specify a buffer offset value when a tape file is created, it is not necessary to specify an offset value when the file is read.

The only buffer offset values allowed for an output file are zero and *BLKDSC. An existing standard-label data file with a buffer offset value in the HDR2 label can be extended only if the buffer offset value is either 0 or 4. A buffer offset value of 0 in the HDR2 label adds data blocks with no buffer offset. BUFOFSET(*BLKDSC) must be specified to extend an existing tape data file that contains an offset value of 4 in the HDR2 label.

This parameter overrides the value specified in the device file, in the program, or in other called OVRTAPF commands.

*BLKDSC: Creates 4-byte block descriptors in any tape file created by using this device file. Any input file read by using this device file should assume 4 bytes of buffer offset information preceding the first record in each data block. This value is valid only for a record block format *D or *DB file. The contents of the buffer offset information of each output data block when BUFOFSET(*BLKDSC) is specified is the actual length of the data block, expressed in zoned decimal format.

buffer-offset: Specify a value ranging from 0 through 99 bytes that specifies the length of the buffer offset information that precedes the first record in each data block.

RCDBLKFMT

Specifies the type and blocking attribute of records in the tape data file being processed.

Record block format *V and *VB records can be processed only for an EBCDIC file; *D and *DB records can be processed only for an ASCII file. If a standard-label tape (label type *SL or *BLP) is being processed and an inconsistent record block format is specified for the volume code, the correct record type is assumed (V or D) for the volume code and a warning message is sent to the program that opens the file. If the record type and code are inconsistent for a nonlabeled volume (label type *NL, *LTM, or *NS), an error message is sent and the file is not opened, because there are no labels to verify the correct volume code.

If a valid record length, block length, and buffer offset value (for an ASCII file) are specified for fixed-length records but the block attribute is incorrect, the correct block attribute is assumed (changing record block format *F to *FB or record block format *FB to *F), and a warning message is sent to the program that opens the file.

If a block length is specified that is longer than required to process a maximum length record, then record block format *V, *D, or *VS is changed to *VB, *DB, or *VBS and a warning message is sent to the program that opens the file.

The Required RCDLEN/BLKLEN/BUFOFSET Relation table, at the end of this parameter description, shows the required relationship between the record length, block length, and buffer offset (for ASCII) file parameters for an output file or an input file where the file parameters are not determined from a second file header label (HDR2).

Note:

When BUFOFSET(*BLKDSC) is specified for the file, a value of 4 should be used for the BUFOFSET part of any BLKLEN calculations, unless existing file labels on the tape specify a different value.

This parameter overrides the value specified in the device file, in the program, or in other called OVRTAPF commands.

*F: Fixed-length, unblocked, unspanned records in either EBCDIC or ASCII code are processed. The system may change this record block format to *FB, based on other file parameters.

*FB: Fixed-length, blocked, unspanned records in either EBCDIC or ASCII code are processed. The system may change this record block format to *F, based on other file parameters.

*V: Variable-length, unblocked, unspanned records in EBCDIC type V format are processed. The system may change this record block format to *VB, *D, or *DB, based on other file parameters.

*VB: Variable-length, blocked, unspanned records in EBCDIC type V format are processed. The system may change this record block format to *DB, based on the volume code.

*D: Variable-length, unblocked, unspanned records in ASCII type D format are processed. The system may change this record block format to *DB, *V, or *VB, based on other file parameters.

*DB: Variable-length, blocked, unspanned records in ASCII type D format are processed. The system may change this record block format to *VB, based on the volume code.

*VS: Variable-length, unblocked, spanned records in either EBCDIC or ASCII code are processed. The system may change this record block format to *VBS, based on other file parameters. Note that the representation of spanned records on the tape is different for EBCDIC and ASCII files, but the system selects the correct format based on the file code.

*VBS: Variable-length, blocked, spanned records in either EBCDIC or ASCII code are processed. Note that the representation of spanned records on the tape differs for EBCDIC and ASCII files, but the system selects the correct format based on the file code.

*U: Undefined format records in either EBCDIC or ASCII code are processed. RCDBLKFMT(*U) records are processed as variable-length records, and each record written or read is in a separate tape block. This format can be useful for processing tape files that do not have the formatting requirements of any other record block format.

The following Required RCDLEN/BLKLEN/BUFOFSET Relation table shows the required relationship between the record length, block length, and buffer offset (for ASCII) file parameters for an output file or an input file where the file parameters are not determined from a second file header label (HDR2).

Note:

When BUFOFSET(*BLKDSC) is specified for the file, a value of 4 should be used for the BUFOFSET part of any BLKLEN calculations, unless existing file labels on the tape specify a different value.

Figure 3. Required RCDLEN/BLKLEN/BUFOFSET Relation

Table 1. Required RCDLEN/BLKLEN/BUFOFSET Relation

CODE	RCDBLKFMT	BLKLEN1
*EBCDIC *ASCII	*F *U *F *U	= RCDLEN = RCDLEN + BUFOFSET
*EBCDIC *ASCII	*FB *FB	= RCDLEN * n = (RCDLEN * n) + BUFOFSET (where n is the number of records in a maximum-length block)
*EBCDIC *ASCII	*V *D	= RCDLEN * 8 = RCDLEN * 4 + BUFOFSET
*EBCDIC *ASCII	*VB *DB	>= RCDLEN + 8 >= RCDLEN + 4 + BUFOFSET
*EBCDIC *ASCII	*VS *VBS *BS *VBS	>= 18 >= 6 + BUFOFSET (18 minimum)
1 Block length (BLKLEN) is a function of record length (RCDLEN) and buffer offset (BUFOFSET).

EXTEND

Specifies, for output operations to tape, whether new records are added to the end of a data file currently on the tape. The specific data file is identified by the SEQNBR parameter and, for a standard-label file, the LABEL parameter. If the data file is extended, it becomes the last file on the tape volume; data files that follow it are overwritten as the specified file is extended.

Note:

This parameter is not valid for 1/4-inch cartridge tape devices.

This parameter overrides the extend value specified in the device file, in the program, or in other called OVRTAPF commands.

Element 1: Adding Records to Data File

*NO: Records are not added to the end of the specified data file. If there is already a data file with the specified SEQNBR on the tape, a new data file is created by overwriting the existing data file and any files that follow it. Records are not added to the end of the specified data

*YES: New records are added to the end of the specified data file on tape when this device file is used.

Element 2: Checking Active Files

If EXTEND(*YES) is specified, the following values check to see whether the file already exists:

*NOCHECK: The file is extended without being checked to see whether the file is active.

*CHECK: Before the file is extended, the file is checked to see whether it is active.

DENSITY

Specifies the density of the data that is written on the tape volume when this device file is created. This parameter is used only for tape files being written to tape; it is ignored for tape files being read from the tape (in the case of files being read from tape, the density on the tape is used).

The density of a standard-label volume is specified on the INZTAP command, which initializes tapes as standard-label volumes by writing volume labels on them. If the density specified on this parameter is different than the density of a standard-labeled tape, the density currently on tape is used and a warning message is sent. The density of a standard-label volume can only be changed by re-initializing the tape.>

*DEVTYPE: The highest capacity density or format supported by the tape device will be used.

Tape device

Highest capacity density or format

2440

6250

3422

6250

3430

6250

3480

*FMT3480

3490E

*FMT3490E

3570-BXX

*FMT3570

3570-CXX

*FMT3570E

3580-001

*ULTRIUM1>

3590

*FMT3590

3590-Exx

*FMT3590E>

6335

*QIC3040

6341

*QIC120

6342

*QIC525

6343

*QIC1000

6344

*QIC2GB

6346

*QIC120

6347

*QIC525

6348

*QIC1000

6349

*QIC2GB

6366

*QIC120

6368

*QIC1000

6369

*QIC2GB

6378

*QIC525

6379

*QIC1000

6380

*QIC2GB

6381

*QIC2DC

6382

*QIC4DC

6383

*QIC5010>

6385

*QIC5010

6386

*MLR3

6387

*SLR100>

6390

*FMT7GB

7207-122

*QIC4DC>

7208-002

*FMT2GB

7208-012

*FMT5GB

7208-222

*FMT7GB

7208-342

*FMT20GB>

9346

*QIC120

9347

3200

9348

6250

*CTGTYPE: The highest capacity density or format supported by the device for the mounted cartridge type will be used. If the device does not support special cartridge type information, *DEVTYPE is used.

tape-density: Specify the density or format to use.

1600

The data density on the tape volume is 1,600 bits per inch, which is used for 1/2 inch reel tapes.

3200

The data density on the tape volume is 3,200 bits per inch, which is used for 1/2 inch reel tapes.

6250

The data density on the tape volume is 6,250 bits per inch, which is used for 1/2 inch reel tapes.

*FMT3480

The format of this tape is FMT3480. The data density on this tape volume is formatted to support a 3480 device. This density is used for 1/2 inch cartridge tapes.

*FMT3490E

The format of this tape is FMT3490E. The data density on this tape volume is formatted to support a 3490E device. This density is used for 1/2 inch cartridge tapes.

*FMT3570

The format of this tape is FMT3570. The data format is written on the tape volume with a 3570 device.

*FMT3570E

The format of this tape is FMT3570E. The data format is written on the tape volume with a 3570E device.

*FMT3590

The format of this tape is FMT3590. The data format is written on the tape volume with a 3590 device. This density is used for 1/2 inch cartridge tapes.

*FMT3590E

The format of this tape is FMT3590E. The data format is written on the tape volume with a 3590E device. This density is used for 1/2 inch cartridge tapes.

*QIC120

The format of this tape is QIC120, which is used for 1/4 inch cartridge tapes that can hold 120 megabytes of data.

*QIC525

The format of this tape is QIC525, which is used for 1/4 inch cartridge tapes that can hold 525 megabytes of data.

*QIC1000

The format of this tape is QIC1000, which is used for 1/4 inch cartridge tapes that can hold 1200 megabytes of data.

*QIC2GB

The format of this tape is QIC2GB. It is used by 1/4 inch tape devices which can store 2.5 gigabytes of data on a standard length QIC2GB cartridge.

*QIC2DC

The format of this tape is QIC2DC. It is used to write compacted data to a 1/4 inch cartridge that supports the QIC2GB format.

*QIC4GB

The format of this tape is QIC4GB. It is used by 1/4 inch tape devices which can store 4 gigabytes of data on a standard length QIC4GB cartridge.

*QIC4DC

The format of this tape is QIC4DC. It is used to write compacted data to a 1/4 inch cartridge that supports the QIC4GB format.

*QIC3040

The format of this tape is QIC3040, which is used for 1/4 inch minicartridge tapes that can hold 840 megabytes of data.

*QIC5010

The format of this tape is QIC5010, which is used for 1/4 inch cartridge tapes that can hold 13.5 gigabytes of data.

*MLR3

The format of this tape is MLR3. It is used by 1/4 inch tape devices which can store 25 gigabytes of data on a standard length MLR3 cartridge.

*SLR100

The format of this tape is SLR100. It is used by 1/4 inch tape devices which can typically store 100 gigabytes of compacted data on a standard length SLR100 cartridge.

*FMT2GB

The format of this tape is FMT2GB, which is used for 8 millimeter cartridge tapes that can hold 2 gigabytes of data.

*FMT5GB

The format of this tape is FMT5GB, which is used for 8 millimeter cartridge tapes that can hold 5 gigabytes of data.

*FMT7GB

The format of this tape is FMT7GB, which is used for 8 millimeter cartridge tapes that can hold 7 gigabytes of data.

*FMT20GB

The format of this tape is FMT20GB. It is used by 8 millimeter tape devices that can store 20 gigabytes of data on a standard length cartridge.

*ULTRIUM1

The format of this tape is ULTRIUM1. It is used by 1/2 inch cartridge tape devices that can store 100 gigabytes of data on a standard length cartridge.

Note:

Some of the density values shown can only be specified when a tape device which supports that density is attached to the system.

Note:

Self-configured tape devices may define additional valid values for the density parameter. Use AS/400 Operations Navigator (Configuration and Service) (Hardware) (Tape Units) (Properties) to find additional valid density values for a specific device, or use the F4=Prompt key on the Tape density field of the CL command to see a list of all valid density values for the attached tape devices.

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COMPACT

Specifies whether device data compaction is performed. If the tape devices being used do not support data compaction, this parameter will be ignored when the file is opened.

This parameter overrides the value specified in the device file, in the program or in other called OVRTAPF commands.

*DEVD: Device data compaction is performed if the devices being used support data compaction.

*NO: Device data compaction is not performed.

CODE

Specifies the character code used. The code can be either extended binary-coded decimal interchange code (*EBCDIC) or the American National Standard Code for Information Interchange (*ASCII).

*EBCDIC: The extended binary-coded decimal interchange code (EBCDIC) character set code is used.

*ASCII: The ASCII character set code is used.

Note:

For standard labeled (*SL) tapes the CODE parameter is used to determine how the labels are processed. For all label types the TBL, FROMCCSID, and TOCCSID parameters control what conversion, if any, is used for the data portion of the files.

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CRTDATE

Specifies, for tape input data files and for tape output for which EXTEND(*YES) is specified, the date when the data file was created (written on tape).

Note:

The data file creation date is stored in file labels on the tape. If a creation date is specified for any type of label processing other than standard-label (*SL), it is ignored. If the creation date written on the tape containing the data file does not match the date specified in this device file description, an inquiry message is sent to the operator.

This parameter overrides the value specified in the program, device file, or in other called OVRTAPF commands.

*NONE: The creation date is not specified. It is not checked unless it is supplied before the device file is opened, either in a OVRTAPF command or CHGTAPF command, or in the high-level language program.

creation-date: Specify the creation date of the data file used by this device file. The date must be specified in the format defined by the job attributes DATFMT and, if separators are used, DATSEP.

EXPDATE

Specifies, for tape output data files only, and only when standard-labeled tapes are used, the expiration date of the data file used by this device file. If a date is specified, the data file is protected and cannot be overwritten until after the specified expiration date. The files cannot be overwritten until after the expiration date.

Note:

The data file expiration date is stored in file labels on the tape. If an expiration date is specified for any type of label processing other than *SL, it is ignored.

This parameter overrides the value specified in the program, device file, or in other called OVRTAPF commands.

*NONE: No expiration date for the data file is specified; the file is not protected. An expiration date is written in the data file labels so the file can be used as a scratch data file.

*PERM: The data file is permanently protected. An expiration date of 999999 is assigned.

expiration-date: Specify the date on which the data file expires, after which it can be overwritten with new data. The expiration date must be later than or equal to the current date. The date must be specified in the format defined by the job attributes QDATFMT and, if separators are used, QDATSEP.

ENDOPT

Specifies the operation that is automatically performed on the tape volume after the operation ends. If more than one volume is included, this parameter applies only to the last tape volume used; all other tape volumes are rewound and unloaded when the end of the tape is reached.

Note:

Unless an ending option is specified by the high-level language program when the file is closed, this parameter overrides the ending operation specified in the device file, in the program, or in other called OVRTAPF commands.

*REWIND: The tape is automatically rewound, but not unloaded, after the operation has ended.

*LEAVE: The tape does not rewind or unload after the operation ends. It remains at the current position on the tape drive.

This option is used to reduce the time required to position the tape if the next tape file that opens to this device uses a data file that is on this volume.

Note:

Even if ENDOPT(*LEAVE) is specified, the next tape file opened to this reel is positioned at the beginning of some data file on the volume (or at the end of a data file, for either read backward or for output that extends an existing data file on the volume). A tape file is always positioned at the start or end of a data file when it is opened.

*UNLOAD: The tape is automatically rewound and unloaded after the operation ends.

USRLBLPGM

Specifies the qualified name of the user program that processes user tape labels. On an output file, the user label program will pass the user labels that are written to tape. On an input file, the user labels are passed to the user label program.

*NONE: There is no user label program for this device file.

The name of the user label program can be qualified by one of the following library values:

*LIBL: All libraries in the job's library list are searched until the first match is found.

*CURLIB: The current library for the job is searched. If no library is specified as the current library for the job, the QGPL library is used.

library-name: Specify the name of the library to be searched.

user-label-program-name: Specify the name of the user program that processes the user tape labels. If no library qualifier is given, *LIBL is used to find the file.

TBL

Specifies the qualified name of a conversion table to be used for single byte conversion of input files or output files. The specified conversion is only used for the data portion of the files. When the specified code is *ASCII (CODE parameter) any labels will be converted between ISO/ASCII 8-Bit code and EBCDIC. When the specified code is *EBCDIC (CODE parameter) the labels, if any, are not converted.

Note:

See system supplied conversion tables QSYS/QASCII and QSYS/QEBCDIC for an example of the conversion used to translate between ISO/ASCII 8-Bit code and EBCDIC.

*DFT: When the specified code is *ASCII (CODE parameter) the data and labels will be converted between ISO/ASCII 8-bit code and EBCDIC. When the specified code is *EBCDIC (CODE parameter) the data and labels will not be converted.

*NONE: The data will not be converted.

*CCSID: The CCSID parameters are used to generate a conversion table to use for converting the data portion of the files.

conversion-table-name: Specify the name of a conversion table to use for conversion of the data between single byte character sets.

The name of the conversion table name can be qualified by one of the following library values:

*LIBL: All libraries in the job's library list are searched until the first match is found.

*CURLIB: The current library for the job is searched. If no library is specified as the current library for the job, the QGPL library is used.

library-name: Specify the name of the library to be searched.

FROMCCSID

Specifies a single byte CCSID used for the input data. The input data is the data read from the tape for input operations, or read from a file for output operations.

from-CCSID: The requested CCSID value is used. The value is validated to ensure that a single byte CCSID is specified. Valid values range from 1 through 65533.

TOCCSID

Specifies the single byte CCSID used for the output data. The output data is the data written to the tape for output operations, or written to a file for input operations.

to-CCSID: The requested CCSID value is used. The value is validated to ensure that a single byte CCSID is specified. Valid values range from 1 through 65533.>

IGCDTA

Specifies whether the file processes double-byte character set (DBCS) data.

*NO: The file does not process DBCS data.

*YES: The file processes DBCS data.

WAITFILE

Specifies the number of seconds that the program waits for the file resources and session resources to be allocated when the file is opened, or for the device or session resources to be allocated when an acquire operation is performed to the file. If those resources are not allocated within the specified wait time, an error message is sent to the program. More information on this parameter is in Commonly used parameters.

Note:

An immediate allocation of the device by the device resource is required when an acquire operation is performed to the file.

This parameter overrides the wait time specified in the program or in the device file.

*IMMED: The program does not wait; when the file is opened, an immediate allocation of the file resources is required.

*CLS: The job default wait time is used as the wait time for the file resources being allocated.

number-of-seconds: Specify the number of seconds that the program waits for the file resources to be allocated to the tape file when the file is opened, or the wait time for the device allocated when an acquire operation is performed to the file. Valid values range from 1 through 32767 seconds.

SECURE

Specifies whether this file is safe from the effects of previously called file override commands. If SECURE is not specified, processing occurs as if SECURE(*NO) is specified.

*NO: This file is not protected from the effects of other file overrides; its values can be overridden by the effects of previously called file override commands.

*YES: This file is protected from the effects of any file override commands previously called.

OVRSCOPE

Specifies the extent of influence (scope) of the override.

*ACTGRPDFN: The scope of the override is determined by the activation group of the program that calls this command. When the activation group is the default activation group, the scope equals the call level of the calling program. When the activation group is not the default activation group, the scope equals the activation group of the calling program.

*CALLLVL: The scope of the override is determined by the current call level. All open operations done at a call level that is the same as or higher than the current call level are influenced by this override.

*JOB: The scope of the override is the job in which the override occurs.

SHARE

Specifies whether the open data path (ODP) for the tape file is shared with other programs in the routing step. When an ODP is shared, the programs accessing the file share facilities such as the file status and the buffer.

More information on shared database files is in the Database Programming topic in the Information Center.

*NO: The ODP created by the program with this attribute is not shared with other programs in the routing step. Every time a program opens the file with this attribute, a new ODP to the file is created and activated.

Note:

This includes many open files in the same program.

*YES: The ODP created with this attribute is shared with each program in the routing step that also specifies SHARE(*YES) when it opens the file.

Note:

When SHARE(*YES) is specified and control is passed to a program, a read operation in that program retrieves the next input record. A write operation produces the next output record.

OPNSCOPE

Specifies the extent of influence (scope) of the open operation.

*ACTGRPDFN: The scope of the open operation is determined by the activation group of the program that called the OVRTAPF command processing program. If the activation group is the default activation group, the scope is the call level of the caller. If the activation group is a non-default activation group, the scope is the activation group of the caller.

*JOB: The scope of the open operation is the job in which the open operation occurs.

Examples for OVRTAPF

Example 1: Overriding a File

OVRTAPF  FILE(OUT)  VOL(DPT706)  LABEL(STATUSR)

This command overrides a file named OUT in the program using the data file STATUSR on tape volume DPT706.

Example 2: Allowing DBCS Data

OVRTAPF  FILE(IGCLIB/IGCTAP)  IGCDTA(*YES)

This command overrides the tape device file named IGCTAP, which is stored in the library IGCLIB, so the file may contain double-byte character set data.

Example 3: Using Data Density of 1600 Bits Per Inch

OVRTAPF  FILE(OUT)  DENSITY(1600)

This command overrides a file named OUT to use a data density of 1600 bits per inch when writing to the tape volume.

Example 4: Using a conversion table to process a tape with EBCDIC labels.

OVRTAPF FILE(FILE1) REELS(*SL) CODE(*EBCDIC)
        TBL(LIB1/TABLE1)

This command overides a tape device file named FILE1 to specify that a conversion table named LIB1/TABLE1 is to be used to convert all data read from, or written to, the tape volume.

Example 5: Using specified CCSIDs to process a non-labeled tape.

OVRTAPF FILE(FILE2) REELS(*NL) TBL(*CCSID)
        FROMCCSID(819) TOCCSID(37)

This command overides a tape device file named FILE2 to specify that any data read from, or written to, the tape volume is to be converted from CCSID 819 to CCSID 37.>

Error messages for OVRTAPF

*ESCAPE Messages

CPF1892

Function &1 not allowed.