2. PLANNING › 2.2 Supported MVS Data Structures › 2.2.8 UNIX System Services (USS) Support

2.2.8 UNIX System Services (USS) Support

The CA MICS Space Collector Option (VCC) can optionally
collect information for UNIX System Services (USS) file
systems. This information can be fed into the CA MICS Space
Analyzer Option (VCA).  The support allows for the collection
and reporting of statistics, as well as the tracking of
actual space utilization of the USS files compared to the
file systems' allocated DASD space.

VCC provides a separate batch job, located in member
sharedprefix.MICS.CNTL(VCCRUNH), to collect file system
information. The data collected from this job can be fed into
VCA for further processing and analysis.  It collects file
systems information for all the file systems mounted to the
z/OS system that the job runs on.  If the AUTOMOUNT facility
is in use, the directory designated for automount processing
will be scanned.  This results in the associated file system
and any file systems under that directory structure to be
automatically mounted, if they are not already mounted.  The
file systems that are unknown to z/OS or are unmounted will
not be scanned.  In the event that your site has multiple
z/OS images using various file systems which may not be
mounted on all z/OS images, it is recommended that you run
VCC on all z/OS images that have file systems mounted.  For a
discussion on shared DASD and z/OS file systems
considerations, see section 2.5.3.

Because of the way USS accesses file systems, plan to monitor
how long VCC takes to collect information on these file
systems initially.  Usually the root file system takes the
longest time to process.  Therefore, you may want to weigh
the benefit of multiple scans during the day with the
performance cost.  Optionally, you may exclude some file
systems from collection.