The CA MICS IBM VTS Performance Overview Report provides a
consolidated view of important VTS metrics. While each of
the other IBM VTS reports focuses on a particular area of the
VTS (such as the physical tape drives, cache, or virtual
mounts) this overview report provides a consolidated set of
critical performance metrics that quantify the performance,
throughput, and constraining factors such as throttling.
Of particular interest are the percentage of VTS DASD cache
virtual volume mount misses, and non-zero throttle
percentages and values. Cache misses and throttling degrade
the optimal performance of the virtual tape subsystem.
The report uses both the distributed and composite VTS
headers, based on the VTS type reported. These headers and
their content is described in section 3.2.1.1.2.
The report body reports on the following measurements from
left to right:
Interval count:
o Number of Recording Intervals - INTERVLS
Virtual Mounts (virtual mount counts, by type, scratch and
specific, with a further breakdown of specific mounts by hits
and misses. The percentage of cache misses is also provided):
o Total Virtual Mounts - fffTVM
o Virtual Fast-Ready (Scratch) Mounts - fffVFRM
o Total Virtual Specific Mounts - fffVSPM
o Specific Cache-Hit Mounts - fffVCHM
o Specific Cache-Miss Mounts - fffVRM
o Percent of specific mounts that were
cache misses - fffPCVMS
Data Transferred (data moved in and out of the VTS DASD
cache):
o Channel blocks written to cache (1000s) - fffNUMBS
o Estimated Avg channel block blocksize - fffAVBSZ
o GB Data Read from VTS DASD Cache - fffDRVV
o GB Data Written to VTS DASD Cache - fffDWVV
Note: fffNUMBS is divided by 1000 for reporting. fffDRVV
and fffDWVV are divided by 1024 to convert MB to GB for
reporting.
Channel MB/Sec (minimum, average, and maximum MB data per
second passing through z/OS host channels to/from the VTS
DASD cache):
o Minimum Channel MB per second - fffMNPSC
o Average Channel MB per second - fffPSCH
o Maximum Channel MB per second - fffMNPSC
Compress Ratios (data compression ratios for data written to
cache and data written to physical tape (backstore)):
o Compression ratio writes to VTS DASD Cache - fffAVHAR
o Compression ratio writes to Physical Tape - VDLAVBSR
Note: For a COMPOSITE VTS, the backstore compression ratio
reported is the maximum found for either the UI or
SECONDARY VTS in the same time interval.
For the UI and SECONDARY VTSs in a peer-to-peer
configuration, the compression ratio for writes to the VTS
DASD cache is not available.
Throttle Values (write overrun throttle percent and throttle
value, and overall throttle value):
o Write overrun throttle percentage - VDLAVWRO
o Write overrun throttle value - VDLAVWOT
o Overall total throttle value - VDLAVTOT
Note: For a COMPOSITE VTS, all three throttle values
reported are the maximum found from either the UI or
SECONDARY VTS in the same time interval.
At the bottom of the report, a line is generated that shows
summary totals, minimums, maximums, averages, or percentages,
as appropriate for the detailed data in each column.
Report data for VTS type COMPOSITE is generated from the
VTS Composite Library Activity (IVTVCL) file. Report data
for VTS types UI, SECONDARY, and STANDALONE is generated from
the VTS Distributed Library Activity (IVTVDL) file.
The throttle values and backstore compression ratio value
reported for the COMPOSITE VTS are determined, during report
code processing, by selecting the maximum value found in
either the UI or SECONDARY VTS for the same time period.
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 TAPLVA, IBM VTS Performance Overview Report,
whose Catalog Group is PERFORM
o Complete the MICF Execution panel
o Complete the specification panel. Refer to section
3.2.1.1.1, IBM VTS MICF Inquiry Specification Panels, for
information about modifiable panel fields.
IBM VTS Performance Overview (TAPLVA) Report Sample
---------------------------------------------------
The following report sample provides a performance overview
for a day by hour. The VTS reported is a peer-to-peer
configuration. The three report pages show the Composite VTS
statistics followed by statistics for the User Interface (UI)
and Secondary VTSs.
The report shows a highly active and somewhat constrained
virtual tape system. The average number of cache misses for
the day is 23%, with a high of 68% at 2:00 PM.
In addition, write overrun throttling is occurring during
most hours of the day. Write overrun throttling results in
degraded z/OS workload performance because the VTS slows down
each write I/O to the DASD cache as it tries to free up
additional cache space.
Inquiry : TAPLVA CA MICS IBM VTS Performance Overview Report Run Date: 02APRyy Data Presented by Hour within Day Page 002 VTS Library ID: K9200 VTC Preferred I/O : NONE Copy Mode Setting : Mixed Report Start: 31MARyy:00:00 Library Type : PtP-COMPOSITE VTC Preferred Mast: VTS0 VTC Maint Level : 7414.00 Report End : 31MARyy:23:00 UI/SEC IDs : K9229/K9230 F/C 4001 Status : Enabled Timespan : DAYS ---------------------------------------------------------------------------------------------------------------------------------- Day: 31MAYyy ----------- Virtual Mounts ------------ ---- Data Transferred ----- -Channel MB/Sec- -Compress-- Throttle Values 1000's Avg GB GB Ratios Avg Avg Numb Cache Cache Pct Ch Blks BSize Cache Cache Wrt Wrt Tot HOUR Intv Total Scrtch Spcfic Hits Miss Miss Written (Est) Read Write Min Avg Max Cache BkStr Pct Val Val ---- ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ----- ---- --- --- 0 1 735 323 412 371 41 10% 9597.99 24000 264.8 270.7 152.3 152.3 152.3 2.83 0.96 17% 126 20 1 1 995 430 565 478 87 15% 11768.7 24000 309.7 321.7 179.6 179.6 179.6 4.31 0.96 6% 78 5 2 1 1293 472 821 700 121 15% 14154.8 25000 386.4 402.5 224.4 224.4 224.4 3.93 0.96 14% 97 12 3 1 557 235 322 253 69 21% 12486.4 26000 164.3 295.7 130.9 130.9 130.9 2.86 0.96 16% 119 17 4 1 666 162 504 453 51 10% 5657.33 24000 400.2 135.0 152.2 152.2 152.2 2.29 0.96 7% 70 5 5 1 806 172 634 565 69 11% 8082.00 25000 384.3 208.3 168.6 168.6 168.6 2.59 0.96 15% 88 13 6 1 458 109 349 314 35 10% 7870.23 29000 334.6 233.3 161.5 161.5 161.5 2.39 0.96 10% 48 5 7 1 492 102 390 332 58 15% 6867.42 32000 322.6 222.7 155.1 155.1 155.1 2.73 0.96 7% 80 5 8 1 604 180 424 319 105 25% 8877.53 31000 384.6 286.1 190.8 190.8 190.8 2.66 0.96 15% 100 15 9 1 315 106 209 160 49 23% 6464.37 33000 202.9 204.4 115.8 115.8 115.8 2.67 0.96 11% 113 13 10 1 163 77 86 79 7 8% 5428.42 29000 168.9 166.0 95.3 95.3 95.3 2.63 0.96 1% 16 0 11 1 113 51 62 54 8 13% 5890.89 22000 223.0 141.5 103.7 103.7 103.7 3.64 0.96 0% 4 0 12 1 162 85 77 68 9 12% 8381.00 24000 295.0 243.1 153.1 153.1 153.1 4.45 0.96 0% 0 0 13 1 253 91 162 131 31 19% 5816.76 10000 197.5 65.0 74.7 74.7 74.7 2.54 0.96 0% 0 0 14 1 290 59 231 74 157 68% 1810.21 21000 205.8 43.0 70.8 70.8 70.8 2.16 0.96 0% 0 0 15 1 718 314 404 261 143 35% 6699.79 22000 290.7 164.2 129.4 129.4 129.4 4.08 0.96 0% 0 0 16 1 902 536 366 240 126 34% 14310.8 24000 361.7 349.5 202.3 202.3 202.3 2.97 0.96 23% 110 25 17 1 812 444 368 237 131 36% 23932.3 25000 246.6 493.0 210.4 210.4 210.4 2.65 0.96 68% 122 81 18 1 842 432 410 267 143 35% 24222.4 25000 270.5 473.1 211.5 211.5 211.5 2.77 0.96 44% 125 55 19 1 1061 524 537 397 140 26% 21968.4 24000 470.8 430.6 256.4 256.4 256.4 2.93 0.96 40% 125 44 20 1 947 441 506 359 147 29% 19027.1 25000 402.7 447.6 241.9 241.9 241.9 2.95 0.96 31% 139 43 21 1 951 429 522 373 149 29% 12136.8 25000 596.2 345.1 267.8 267.8 267.8 3.75 0.96 20% 86 18 22 1 689 293 396 279 117 30% 10418.9 24000 399.3 294.7 197.4 197.4 197.4 3.63 0.96 10% 71 7 ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ----- ---- --- --- Tots 23 14824 6067 8757 6764 1993 23% 251871 25000 7283 6237 70.8 184.6 267.8 3.12 0.96 15% 75 17 ----------------------------------------------------------------------------------------------------------------------------------
Inquiry : TAPLVA CA MICS IBM VTS Performance Overview Report Run Date: 02APRyy Data Presented by Hour within Day Page 002 VTS Library ID: K9229 Library Make-Model: 3584-L22 Lib Maint Level: 534.33 Report Start: 31MARyy:00:00 Library Type : PtP-UI VTS Cache Size : 1728 GB VTS Maint Level: 7414.00 Report End : 31MARyy:23:00 Composite ID : K9200 F/C 4001 Status : Enabled Timespan : DAYS ---------------------------------------------------------------------------------------------------------------------------------- Day: 31MAYyy ----------- Virtual Mounts ------------ ---- Data Transferred ----- -Channel MB/Sec- -Compress-- Throttle Values 1000's Avg GB GB Ratios Avg Avg Numb Cache Cache Pct Ch Blks BSize Cache Cache Wrt Wrt Tot HOUR Intv Total Scrtch Spcfic Hits Miss Miss Written (Est) Read Write Min Avg Max Cache BkStr Pct Val Val ---- ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ----- ---- --- --- 0 1 737 489 248 223 25 10% 6197.62 10000 36.0 54.9 25.9 25.9 25.9 n/a 0.95 17% 118 20 1 1 997 697 300 247 53 18% 4555.16 8000 40.8 27.7 19.5 19.5 19.5 n/a 0.95 4% 56 2 2 1 1300 885 415 349 66 16% 6534.91 9000 37.6 44.6 23.4 23.4 23.4 n/a 0.95 14% 90 12 3 1 564 411 153 111 42 27% 3909.93 12000 28.0 40.2 19.4 19.4 19.4 n/a 0.95 13% 119 15 4 1 669 432 237 209 28 12% 2630.00 13000 56.2 29.0 24.2 24.2 24.2 n/a 0.95 7% 70 5 5 1 815 484 331 279 52 16% 3471.86 14000 82.1 40.0 34.7 34.7 34.7 n/a 0.95 10% 88 9 6 1 465 281 184 156 28 15% 2884.17 13000 77.1 32.2 31.1 31.1 31.1 n/a 0.95 10% 48 5 7 1 495 283 212 164 48 23% 3180.23 11000 64.9 30.8 27.2 27.2 27.2 n/a 0.95 6% 80 5 8 1 606 385 221 165 56 25% 4921.94 15000 72.0 66.9 39.5 39.5 39.5 n/a 0.95 15% 100 15 9 1 316 202 114 89 25 22% 3726.05 15000 36.7 47.8 24.0 24.0 24.0 n/a 0.95 5% 66 3 10 1 162 109 53 49 4 8% 3356.84 10000 31.3 31.5 17.9 17.9 17.9 n/a 0.95 1% 7 0 11 1 114 79 35 28 7 20% 2936.40 10000 45.9 22.3 19.4 19.4 19.4 n/a 0.95 0% 4 0 12 1 162 116 46 40 6 13% 1839.08 12000 32.6 17.7 14.3 14.3 14.3 n/a 0.95 0% 0 0 13 1 256 156 100 84 16 16% 3416.38 7000 46.5 17.5 18.2 18.2 18.2 n/a 0.95 0% 0 0 14 1 290 157 133 31 102 77% 935.95 7000 40.8 6.1 13.4 13.4 13.4 n/a 0.95 0% 0 0 15 1 720 510 210 127 83 40% 3483.47 6000 48.3 17.6 18.8 18.8 18.8 n/a 0.95 0% 0 0 16 1 907 721 186 124 62 33% 11387.0 9000 64.0 82.2 41.6 41.6 41.6 n/a 0.95 23% 110 25 17 1 817 617 200 134 66 33% 9818.39 10000 43.3 82.6 35.8 35.8 35.8 n/a 0.95 56% 122 69 18 1 853 626 227 150 77 34% 12722.5 8000 43.0 85.0 36.4 36.4 36.4 n/a 0.95 41% 118 49 19 1 1064 795 269 191 78 29% 12077.6 9000 40.8 85.6 36.0 36.0 36.0 n/a 0.95 35% 125 44 20 1 957 687 270 165 105 39% 8426.56 10000 49.3 70.7 34.1 34.1 34.1 n/a 0.95 31% 135 43 21 1 958 688 270 185 85 31% 5507.64 8000 64.4 36.6 28.7 28.7 28.7 n/a 0.95 14% 82 11 22 1 701 500 201 128 73 36% 5048.19 10000 51.3 36.0 24.8 24.8 24.8 n/a 0.95 3% 28 0 ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ----- ---- --- --- Tots 23 14925 10310 4615 3428 1187 26% 122968 10000 1133 1006 13.4 28.9 41.6 n/a 0.95 13% 68 14 ----------------------------------------------------------------------------------------------------------------------------------
Inquiry : TAPLVA CA MICS IBM VTS Performance Overview Report Run Date: 02APRyy Data Presented by Hour within Day Page 002 VTS Library ID: K9230 Library Make-Model: 3584-L22 Lib Maint Level: 534.33 Report Start: 31MARyy:00:00 Library Type : PtP-SECONDARY VTS Cache Size : 1728 GB VTS Maint Level: 7414.00 Report End : 31MARyy:23:00 Composite ID : K9200 F/C 4001 Status : Enabled Timespan : DAYS ---------------------------------------------------------------------------------------------------------------------------------- Day: 31MAYyy ----------- Virtual Mounts ------------ ---- Data Transferred ----- -Channel MB/Sec- -Compress-- Throttle Values 1000's Avg GB GB Ratios Avg Avg Numb Cache Cache Pct Ch Blks BSize Cache Cache Wrt Wrt Tot HOUR Intv Total Scrtch Spcfic Hits Miss Miss Written (Est) Read Write Min Avg Max Cache BkStr Pct Val Val ---- ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ----- ---- --- --- 0 1 783 596 187 149 38 20% 5344.43 12000 32.4 52.9 24.3 24.3 24.3 n/a 0.96 14% 126 17 1 1 878 665 213 171 42 20% 5336.95 9000 32.6 37.2 19.9 19.9 19.9 n/a 0.96 6% 78 5 2 1 1241 857 384 323 61 16% 10451.3 8000 43.9 67.4 31.6 31.6 31.6 n/a 0.96 10% 97 10 3 1 793 539 254 202 52 20% 6298.51 11000 22.4 56.5 22.4 22.4 22.4 n/a 0.96 16% 107 17 4 1 632 383 249 211 38 15% 4025.96 11000 64.4 37.6 29.0 29.0 29.0 n/a 0.96 3% 27 0 5 1 813 497 316 260 56 18% 3624.19 12000 65.4 36.6 29.0 29.0 29.0 n/a 0.96 15% 87 13 6 1 502 322 180 154 26 14% 4391.89 15000 69.4 54.2 35.2 35.2 35.2 n/a 0.96 10% 47 4 7 1 473 299 174 151 23 13% 4943.93 14000 61.4 62.4 35.2 35.2 35.2 n/a 0.96 7% 70 5 8 1 618 402 216 163 53 25% 3953.12 11000 73.0 38.3 31.7 31.7 31.7 n/a 0.96 9% 60 5 9 1 389 265 124 87 37 30% 2665.91 15000 40.4 33.6 21.1 21.1 21.1 n/a 0.96 11% 113 13 10 1 177 138 39 27 12 31% 2776.55 12000 22.2 27.5 14.1 14.1 14.1 n/a 0.96 1% 16 0 11 1 109 85 24 23 1 4% 3120.59 8000 36.6 22.1 16.7 16.7 16.7 n/a 0.96 0% 4 0 12 1 180 142 38 32 6 16% 4494.83 8000 42.3 25.9 19.4 19.4 19.4 n/a 0.96 0% 0 0 13 1 204 159 45 39 6 13% 3481.19 5000 27.9 12.3 11.4 11.4 11.4 n/a 0.96 0% 0 0 14 1 307 205 102 33 69 68% 1185.96 18000 47.8 17.5 18.6 18.6 18.6 n/a 0.96 0% 0 0 15 1 514 378 136 65 71 52% 2008.53 9000 36.5 15.2 14.7 14.7 14.7 n/a 0.96 0% 0 0 16 1 894 684 210 145 65 31% 8738.10 9000 61.5 58.4 34.1 34.1 34.1 n/a 0.96 5% 54 3 17 1 947 755 192 124 68 35% 10299.0 11000 54.2 91.7 41.5 41.5 41.5 n/a 0.96 68% 119 81 18 1 776 600 176 101 75 43% 9893.41 9000 55.4 71.5 36.1 36.1 36.1 n/a 0.96 44% 125 55 19 1 823 650 173 103 70 40% 10817.9 8000 56.8 71.4 36.5 36.5 36.5 n/a 0.96 40% 110 44 20 1 1121 796 325 226 99 30% 9530.00 9000 65.3 68.9 38.2 38.2 38.2 n/a 0.96 23% 139 32 21 1 962 720 242 163 79 33% 7405.04 10000 72.7 63.3 38.7 38.7 38.7 n/a 0.96 20% 86 18 22 1 852 603 249 161 88 35% 4585.70 11000 63.0 41.0 29.6 29.6 29.6 n/a 0.96 10% 71 7 ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ----- ---- --- --- Tots 23 14988 10740 4248 3113 1135 27% 129373 10000 1147 1063 11.4 30.2 41.5 n/a 0.96 14% 67 14 ----------------------------------------------------------------------------------------------------------------------------------
Figure 3-5. IBM VTS Performance Overview
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