The CA MICS STK VSM Age Distribution of Recalled VTV report
is created from the Recall VTV Request (SVTVRR) file. This
report shows the elapsed time between the time the VTV was
last accessed and when it was recalled back to the disk
buffer. Counts on the left side of the report indicate that
the VTV was migrated and then recalled in a very short time.
If these numbers are excessive, further detailed analysis of
these recalls are necessary to determine the reason for the
fast recall. The reason may indicate that particular volumes
should be created with a storage class that will keep the
volume in the disk buffer longer to avoid recall delays.
The report body displays the following measurements from
the VTV Recall file (SVTVRR):
o Number of virtual tape volume recalls from a multivolume
cartridge based on the age since the VTV was last used in:
- 0 seconds to less than 1 minute
- 1 minute to less than 5 minutes
- 5 minutes to less than 10 minutes
- 10 minutes to less than 30 minutes
- 30 minutes to less than 60 minutes
- 1 hour to less than 2 hours
- 2 hours to less than 5 hours
- 5 hours to less than 12 hours
- 12 hours to less than 24 hours
- 1 day to less than 2 days
- 2 days to less than 3 days
- Greater than 3 days
The metrics from the database used to create this chart were
as follows:
o VRRMTA - Total VTV Recalls (Auto)
o VRRLTM - Age Since Last Mounted
USAGE CONSIDERATIONS:
This report can be surprising, especially if there are
significant counts in the columns on the left side of the
report. This means that the virtual tape volumes are being
migrated out of the disk buffer, only to be recalled a very
short time later. If these numbers are significant, further
analysis can help you determine the data usage requirements.
This may lead to a change in the storage class assignments,
so these virtual volumes stay in the disk buffer longer to be
readily available to the next job that needs the data.
To produce the report:
o Enter the CA MICS Workstation Facility (MWF)
o Choose option 2, CA MICS Information Center Facility
(MICF)
o Choose option 2, Database Inquiries
o Select TAPLSH, whose Catalog Group is PERFORM
o Complete the MICF Execution panel
o Complete the specification panel. Refer to section
3.2.2.1, StorageTek VSM MICF Inquiry Specification
Panels, for information about modifiable panel fields.
The following report sample shows the recall distribution by
host system within each VTSS.
INQUIRY: TAPLSH CA MICS STK VSM Recall Age Distribution Report RUN DATE: 18AUGyy Activity Summarized by Day Page 001 VTSS Library ID:VTSS1 Report Start: 04MAYyy:02:16 Report End : 04MAYyy:23:59 Timespan : Daily ---------------------------------------------------------------------------------------------------------------------------------- Day: 04MAYyy -------------------------------------------------------------------------------------------------------------------------------+ < < < < < < < < < < < > | System 00:01:00 00:05:00 00:10:00 00:30:00 01:00:00 02:00:00 05:00:00 12:00:00 24:00:00 48:00:00 72:00:00 72:00:00 | ID Minute Minutes Minutes Minutes Hours Hours Hours Hours Hours Hours Hours Hours | ------ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- SYS1 4 1 0 1 0 0 0 0 0 0 0 167 SYS2 0 0 0 0 0 0 0 0 0 0 0 5 SYS3 0 0 0 0 0 0 0 0 0 0 0 0 SYS4 0 0 0 0 0 0 0 0 0 0 0 10 SYS5 0 0 0 0 0 0 0 0 0 0 0 144 ------ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- Totals 4 1 0 1 0 0 0 0 0 0 0 326 ---------------------------------------------------------------------------------------------------------------------------------- INQUIRY: TAPLSH STK VSM Recall Age Distribution Report RUN DATE: 18AUGyy Activity Summarized by Day Page 002 VTSS Library ID:VTSS2 Report Start: 04MAYyy:02:16 Report End : 04MAYyy:23:59 Timespan : Daily ---------------------------------------------------------------------------------------------------------------------------------- Day: 04MAYyy -------------------------------------------------------------------------------------------------------------------------------+ < < < < < < < < < < < > | System 00:01:00 00:05:00 00:10:00 00:30:00 01:00:00 02:00:00 05:00:00 12:00:00 24:00:00 48:00:00 72:00:00 72:00:00 | ID Minute Minutes Minutes Minutes Hours Hours Hours Hours Hours Hours Hours Hours | ------ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- SYS1 3 1 0 0 0 0 0 0 0 0 0 188 SYS2 0 0 0 0 0 0 0 0 0 0 0 0 SYS3 0 0 0 0 0 0 0 0 0 0 0 6 SYS4 0 0 0 0 0 0 0 0 0 0 0 11 SYS5 0 0 0 0 0 0 0 0 0 0 0 98 ------ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- Totals 3 1 0 0 0 0 0 0 0 0 0 303 ----------------------------------------------------------------------------------------------------------------------------------
Figure 3-19. StorageTek VSM Age Distribution of Recalled VTV
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