Monitoring zFS performance
You can monitor zFS performance using the MODIFY command. The output
from the MODIFY ZFS,QUERY command is written to the system log. The
syntax of this command and an explanation of the report and
their option values, if any, are shown as
follows.
modify zfs,query,<report>,<option>Note: 
If zFS is running
in the OMVS address space, the syntax of the modify command is as
follows:
If zFS is running
in the OMVS address space, the syntax of the modify command is as
follows:modify omvs,pfs=zfs,query,<report>,<option>- ALL
- Shows all of the reports. However, for
the STOR report, the DETAILS option is off and the FILE report indicates
only active file systems.
- CTKC
- Displays the client token manager statistics. CTKC is only present when the system is a sysplex client of another system and the zFS CTKC component on this system sent a message to another system. See CTKC for details of the report.
- DATASET
- Displays zFS statistics about file systems.
- FILE
- Provides a detailed breakdown of requests per zFS file system and aggregate. By default, this report lists only file systems and aggregates that had active requests since the last statistics reset. If you use the ALL option, you get all file system and aggregates regardless of whether they were active or not. See FILE for details of the report.
- IOBYDASD
- Displays the I/O statistics by currently attached DASD volumes including the total number of waits for I/O and the average wait time per I/O. See IOBYDASD for details of the report.
- KN
- Provides counts of calls that are made to zFS from z/OS® UNIX and the average response time of each call. This information is the basic measure of zFS performance. See KN for details of the report.
- LFS
- Provides detailed file system statistics including the performance of the zFS metadata cache, the vnode cache, and the aggregate I/O statistics. See LFS for details of the report.
- LOCK
- Provides a measure of lock contention and how often z/OS UNIX threads wait for certain events such as user file cache reclaim. See LOCK for details of the report.
- LOG
- Provides performance information for the log file cache. See LOG for details of the report.
- STKM
- Displays the current server token manager (STKM) statistics. See STKM for details of the report.
- STOR
- Provides a detailed breakdown of zFS allocated storage by component. By default, this report lists only storage usage by zFS component. If you use the DETAILS option, you get more detailed information for each zFS component. See STOR for details of the report.
- SVI
- Displays the calls from other systems to this
server through the server vnode interface (SVI) component. Output
is only displayed when the zFS SVI component on the local system has
received a message from a client system.
- VM
- Provides performance information for the user file cache including cache hit ratios, I/O rates, and storage usage. See VM for details of the report.