10. MODIFICATION › 10.1 Parameter Modification › 10.1.4 Change Active Timespans For An Element

10.1.4 Change Active Timespans For An Element

Alter the active timespans for an element by updating the
element NAME or NAMX statement in the cccGENIN member of
sharedprefix.MICS.PARMS.  You can turn off an element
completely and thereby remove it from the CA MICS Space
Analyzer.  This can be a useful way to reduce the size of
your database.

Be very careful when altering the active timespans for an
element, because it is possible to eliminate data from higher
timespans (the element will become a missing value) if only
the DETAIL or DAYS timespan is inactivated.   After you make
the change to the NAME or NAMX statement, you must run
VCACGEN.

Refer to Section 4.2.4.3 of the System Modification Guide for
more information about these statements.

Example: Turning Off Detailed Extent Information

Chapter 7 discusses a VCAPGEN parameter called EXTENTDETAIL
which defaults to NO. This controls the "vertical" dimension
of the VCADAA and VCA_VS files by eliminating the "extra"
observations that would be created by VCA to represent the
detail extent locations for data sets having greater than 16
extents.

Let's assume you are looking for ways to conserve the amount
of space taken by VCA and want to affect the "horizontal"
dimension of the observations with regard to detail extent
information.

The modification below will save a significant amount of
space and the only tradeoff is that you will not be able to
run the TRACKMAP reports (see Chapter 3 of this guide).

a. Update sharedprefix.MICS.GENLIB(VCAGENIN) by changing the
   specification for the DETAIL timespan from 0 to N for
   everything but the first extent.

 As distributed:
 ---------------
 NAME DAAXSZ01 00 0 N N N N
 NAME DAAXSZ02 00 0 N N N N
 NAME DAAXSZ03 00 0 N N N N
 ...(repeat for extents 04 through 16)....
 NAME DAAXTK01 00 0 N N N N
 NAME DAAXTK02 00 0 N N N N
 NAME DAAXTK03 00 0 N N N N
 ...(repeat for extents 04 through 16)....

 After your modification:
 ------------------------
 NAME DAAXSZ01 00 0 N N N N
 NAME DAAXSZ02 00 N N N N N
 NAME DAAXSZ03 00 N N N N N
 ...(repeat for extents 04 through 16)....
 NAME DAAXTK01 00 0 N N N N
 NAME DAAXTK02 00 N N N N N
 NAME DAAXTK03 00 N N N N N
 ...(repeat for extents 04 through 16)....

Repeat this process of changing from 0 to N for the same set
of elements in the VCA_VS parallel file further down in
VCAGENIN.

b. If you keep DAAXSZ01 and DAAXTK01 active (set to 0), you
   can still get the benefit of the Volume Problems Report
   (STGECA) produced by CA MICS StorageMate.

c. Submit VCACGEN and ensure it completes without problems.