The CA MICS STK VSM VTD Usage Summary report is created from
measurements in the VTV Mount Request (SVTVMR) and VTV
Dismount Request (SVTVDR) files. The report displays the
usage patterns of the virtual tape drives by hour. Important
information in this report is the maximum number of
concurrent tape drives in use at any point in the hour.
The report body displays the following measurements derived
by combining the VTV Mount file (SVTVMR) and the VTV Dismount
file (SVTVDR).
o Minimum virtual tape drives allocated concurrently
o Average virtual tape drives allocated concurrently
o Maximum virtual tape drives allocated concurrently
o Number of unique virtual tape drive addresses used
o Number of virtual tape volumes mounted during the
reporting period
o Average duration a virtual tape drive was allocated to a
job
o Maximum duration in time a virtual tape drive was
allocated
o Graphic of maximum concurrent VTD usage
USAGE CONSIDERATIONS:
Number of tape drives is a fixed resource. The number of
virtual drives available to a system can be quite high.
Still, this resource needs to be monitored and tracked.
Typically several host systems will share the resources of a
VTSS. If a VTSS has the capacity for 1024 virtual tape
drives, and four systems are sharing the resource, each host
may be allocated 256 virtual tape drives. This may seem like
a lot, but during peak production tape usage, they may all be
consumed. By monitoring and tracking the virtual tape drive
usage patterns, the storage administrator may be able to
alert production control staffs of potential periods of
resource shortages in advance, allowing time for possible
schedule shifts.
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 TAPLSD, 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 usage of the virtual
tape drive by hour by day for each host system using the VTSS
resource.
INQUIRY: TAPLSD CA MICS STK VSM VTD Usage Summary RUN DATE: 18AUGyy Data Presented by Hour within Day Page 001 VTSS Library ID:VTSS1 Report Start: 28MAYyy:00:02 Report End : 29MAYyy:01:25 Timespan : DETAIL ---------------------------------------------------------------------------------------------------------------------------------- Day: 28MAYyy -----Concurrent VTD Usage------------------------------ --VTD Occupancy Times--------------------------------------------+ Minimum Average Maximum | Unique VTD Total | | | VTDs VTDs VTDs | Addresses VTVs | | Concurrent VTD Usage | HOUR Allocated Allocated Allocated | Used Mounted | Average Maximum TotaL | | ---- --------- --------- --------- ---------- ------- -------- -------- -------- |0---10---20---30---40---50---60---| 0 1 13 29 97 164 0:02:45 0:00:02 9:02:41 *************** 1 15 23 33 101 250 0:03:53 0:00:29 18:31:11 ***************** 2 23 29 42 126 325 0:04:16 0:04:00 22:46:53 ********************* 3 14 20 37 96 201 0:06:04 0:00:00 15:57:44 ******************* 4 10 19 30 141 362 0:03:22 0:00:10 11:59:34 *************** 5 13 20 38 113 324 0:03:14 0:00:04 14:50:12 ******************* 6 20 27 38 135 426 0:02:55 0:02:07 19:27:40 ******************* 7 16 23 28 120 378 0:03:04 0:01:15 16:45:52 ************** 8 15 23 30 98 387 0:03:30 0:02:15 17:10:00 *************** 9 9 17 27 108 257 0:03:21 0:02:54 12:27:46 ************** 10 11 18 23 96 227 0:03:24 0:00:31 13:37:44 ************ 11 9 14 20 73 165 0:05:26 0:06:50 10:19:57 ********** 12 5 11 20 72 168 0:03:15 0:01:15 7:48:10 ********** 13 6 12 23 89 190 0:02:42 0:00:00 8:36:05 ************ 14 8 13 17 87 168 0:03:32 0:02:16 9:06:22 ********* 15 8 15 25 83 142 0:03:58 0:10:01 11:21:06 ************* 16 8 17 28 119 235 0:03:29 0:03:52 11:25:22 ************** 17 4 11 21 85 184 0:02:26 0:00:00 7:20:43 *********** 18 3 8 24 73 136 0:02:14 0:00:01 4:40:31 ************ 19 5 9 23 77 108 0:04:20 0:00:13 5:58:47 ************ 20 9 14 26 114 222 0:04:26 0:04:09 9:31:29 ************* 21 7 14 27 95 235 0:03:11 0:06:49 9:15:19 ************** 22 2 8 24 103 176 0:01:27 0:00:52 3:32:38 ************ 23 11 18 32 155 383 0:01:36 0:00:02 8:54:09 **************** ----------------------------------------------------------------------------------------------------------------------------------
Figure 3-15. StorageTek VSM VTD Usage Summary Report
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