STK VSM Age Distribution of Recalled VTV (TAPLSH)
The
MICS
STK VSM Age Distribution of Recalled VTV report is created from the Recall VTV Request (SVTVRR) file.micsrm140
The
MICS
STK VSM Age Distribution of Recalled VTV 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 might 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):
- 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:
- VRRMTA.-.Total VTV Recalls (Auto)
- 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:
- Enter theMICS Workstation Facility(MWF)
- Choose option 2,MICS Information Center Facility(MICF)
- Choose option 2, Database Inquiries
- Select TAPLSH, whose Catalog Group is PERFORM
- Complete the MICF Execution panel
- Complete the specification panel. For information about modifiable panel fields, see StorageTek VSM MICF Inquiry Specification Panels.
The following report sample shows the recall distribution by host system within each VTSS.
StorageTek VSM Age Distribution of Recalled VTV Sample
INQUIRY: TAPLSHMICSSTK 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 ----------------------------------------------------------------------------------------------------------------------------------