"Root", <a href="http://www.setgetweb.com/p/iSeries/v5r3/rzaaxmstopenfs.htm">QOpenSys</a>, or <a href="http://www.setgetweb.com/p/iSeries/v5r3/rzaaxmstudfsfs.htm">UDFS</a> unavailability

Integrated File System Introduction

"Root", QOpenSys, or UDFS unavailability

The conversion of the "root" (/) or QOpenSys file systems must be done when the system is in a restricted state. When converting UDFSs, the system is not required to be in a restricted state; however, the UDFSs in that ASP are not available during the conversion. The length of time required to perform a conversion is dependent on the size of the file system. Therefore, planning is necessary in order to schedule the best time to perform the conversion. The *ESTIMATE option of the CVTDIR command estimates the length of time needed to convert the specified file system. The time length estimated is the highest estimated value. It estimates the time length based on a conversion run in a job with a single thread. The actual conversion uses multiple threads and should take less time than the estimated time. Typically, file systems that have more than 40,000 links can be converted in 30 percent to 50 percent of the estimated time. However, the actual time is dependent on the hardware and configuration of the server. Using the *ESTIMATE option does not require the system to be in a restricted state. The length of time that the system will take to complete the estimate depends on the number of objects in directories and on the workload on the system.
If the system abnormally ends while the CVTDIR command is running, then during the subsequent IPL, the conversion function runs in the SCPF job. The SCPF job does not allow multiple threads to be active. Therefore, when the conversion of a file system must be completed during the IPL, it runs using a single thread. The conversion function runs when SRC C900 2A85 is displayed during the IPL, and status message CPIA089 is displayed, indicating the progress of the conversion.
The conversion function runs during RCLSTG if there are lost *TYPE1 directories from a file system already converted to *TYPE2. The conversion function runs in the job that issues the RCLSTG command. If any lost directories are found that need to be converted, the conversion runs in a single thread because of system restrictions.
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