Checking the operating environment

 

Before you install WebSphere MQ V6.0, check that your system meets the hardware and operating system software requirements set for this product and the particular components you intend to install on it.

WebSphere MQ does not support host names that contain spaces. If you install WebSphere MQ on a computer with a host name that contains spaces, you will be unable to create any queue managers.

 

Hardware

WebSphere MQ for AIX, V6.0 runs on any machine that supports the AIX5L V5.2 or AIX5L V5.3 operating systems capable of running 64-bit programs whether from IBM or other vendors.

 

Operating System

The operating systems supported by WebSphere MQ for AIX, V6.0 are:

• AIX5L V5.2 (plus maintenance Level 3)

• AIX5L V5.3

Use the oslevel -r command to determine the level of the operating system you are running, including the maintenance level.

 

Connectivity Requirements

Check that the system has 64-bit compatible communications hardware that supports at least one of the following:

• TCP/IP

• SNA LU6.2: If you want to use the SNA LU6.2 support on WebSphere MQ you need the IBM Communications Server for AIX Version 6.1.

UDP is no longer supported, existing channels should either be deleted or migrated to one of the supported protocols listed above. To migrate UDP channels to an alternative protocol alter the channel TRPTYPE attribute. For information about this channel attribute see the Intercommunication book.

 

Storage Requirements

The storage requirements for the WebSphere MQ for AIX, V6.0 depend on which components you install, and how much working space we need. This, in turn, depends on the number of queues that you use, the number and size of the messages on the queues, and whether the messages are persistent. You also require archiving capacity on disk, tape or other media. The approximate amount of storage space required for a server installation is detailed in the table below.

Storage requirements for a WebSphere MQ client

Storage Requirements	Storage Requirement in MB in /opt
WebSphere MQ Client installation	276

We can use the df command to determine the amount of free space on your system.

Disk storage is also required for

• Prerequisite software

• Optional software

• Your application programs

 

File descriptors

When running a multi-threaded process such as the agent process, you might reach the soft limit for file descriptors. This gives you the WebSphere MQ reason code MQRC_UNEXPECTED_ERROR (2195) and, if there are enough file descriptors, a WebSphere MQ FFST™ file.

To avoid this problem, we can increase the process limit for the number of file descriptors. To do this, alter the nofiles attribute in /etc/security/limits to 10,000 for the mqm user id or in the default stanza. For information about the mqm user id see, Set up the user ID and group ID.

 

System Resource Limits

Set the system resource limit for data segment and stack segment to unlimited using the following commands in a command prompt:

unlimit -d unlimited
unlimit -s unlimited

 

Parent topic:

Checking hardware and software requirements

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