Although CA CSM can support both HFS and zFS file systems, we recommend using only zFS file systems for both the installation file systems, as well as the ongoing application file systems, because of the superior performance of zFS over HFS.
Business Value:
IBM announced that, beginning with z/OS 1.7, zFS is the strategic z/OS UNIX file system. IBM also formally recommends that you use zFS file systems and migrate all existing HFS file systems to zFS. Installing CA CSM with zFS file systems eliminates the need to migrate CA CSM from HFS to zFS at a later date. This migration activity includes steps to update the CA CSM internal mount table that resides in the CA CSM database CA Datacom/MSM. The zFS file system also has higher performance characteristic than HFS and will create better performance and throughputs than HFS.
Additional Considerations:
In order to implement using zFS file systems, you must verify that the zFS address space is running and configured for your environment. For a zFS file system to grow dynamically, you must specify AGGRGROW when you mount the file system. This can be set globally for all zFS file systems using the IOEFSPRM member of SYS1.PARMLIB.
More Information:
See the IBM UNIX System Services Planning Guide (z/OS release specific) and the IBM HFS to zFS Migration Tool Redbook (REDP4328.pdf) for more information. You can also reference the IBM z/OS Distributed File Service zSeries File System Administration for more details on setting up the zFS address space for your environment.
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