The CA MICS IBM Hydra Performance Overview Report provides a
consolidated view of important virtual tape server 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. Cache misses and throttling degrade the optimal
performance of the virtual tape subsystem.
The report uses the report header described in section
3.2.3.1.2.
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 - HCATVM
o Virtual Fast-Ready (Scratch) Mounts - HCAFRM
o Total Virtual Specific Mounts - HCACHM+HCACMM
o Specific Cache-Hit Mounts - HCACHM
o Specific Cache-Miss Mounts - HCACMM
o Percent of specific mounts that were
cache misses - HCAPCVCM
Data Transferred (data moved in and out of the VTS DASD
cache):
o Channel blocks written to cache (1000s) - HCANUMBS
o Estimated Avg channel block blocksize - HCAAVBSZ
o GB Data Read from VTS DASD Cache - HCAVDR
o GB Data Written to VTS DASD Cache - HCAVDW
Note: HCANUMBS is divided by 1000 for reporting. HCAVDR
and HCAVDW 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 - HCAMNCDS
o Average Channel MB per second - HCAAVCDS
o Maximum Channel MB per second - HCAMXCDS
Compress Ratios (data compression ratios for data written to
cache:
o Compression ratio writes to VTS DASD Cache - HCAAVCWC
Throttle percentages:
o Write-overrun throttle percentage - HCAPCWOT
o Copy-predominant percentage - HCAPCCPT
o Deferred-copy percentage - HCAPCDCT
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.
All report data is generated from the Hydra Cluster Summary
(HVTHCA) file.
To produce the report:
1. Enter the CA MICS Workstation Facility (MWF)
2. Select option 2, CA MICS Information Center Facility
(MICF)
3. Select option 2, Database Inquiries
4. Select TAPLHA, IBM HYDRA Performance Overview, in
Catalog Group PERFORM
5. Complete the MICF Execution panel
6. Complete the specification panel.
Refer to section 3.2.3.1.1, IBM HYDRA MICF Inquiry
Specification Panels, for information about modifiable
panel fields.
Inquiry : TAPLHA CA MICS IBM Hydra Performance Overview Report Run Date: 29MAYyy Data Presented by Hour within Day Page 001 Cluster Identification #: 0 Grid Composite Identification: 10000 Report Start: 28MAYyy:00:00 Node Identification #: N/A Distributed Library Sequence #: 10001 Report End : 29MAYyy:00:00 Node Serial Number: 78-42FG3 Virtual Engine Code Level: 8.5.0.154 Timespan : DAYS --------------------------------------------------------------------------------------------------------------------------------- Day: 28MAYyy ----------- Virtual Mounts ------------ ---- Data Transferred ----- -Channel MB/Sec- Compress Throttle Values 1000's Avg GB GB Ratio Defr Numb Cache Cache Pct Ch Blks BSize Cache Cache Wrt to Wrt Copy Copy HOUR Intv Total Scrtch Spcfic Hits Miss Miss Written (Est) Read Write Min Avg Max Cache Pct Pct Pct ---- ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ---- ---- ---- 0 4 137 73 64 64 0 0% 6940.87 28000 0.0 81.1 28.6 51.2 61.6 2.22 3% 0% 0% 1 4 443 303 140 139 1 1% 23869.7 26000 2.0 225.8 142.8 211.6 271.3 3.26 0% 0% 0% 2 4 311 203 108 107 1 1% 26503.6 40000 1.5 251.2 229.8 288.2 329.2 4.02 0% 0% 0% 3 4 218 119 99 99 0 0% 14052.6 39000 5.6 164.8 137.4 153.8 171.5 3.10 0% 0% 0% 4 4 198 127 71 71 0 0% 9551.71 35000 15.0 131.2 30.9 112.3 203.7 2.60 0% 0% 0% 5 4 144 109 35 35 0 0% 9387.68 33000 0.0 177.3 50.3 89.0 112.3 1.76 0% 0% 0% 6 4 153 100 53 53 0 0% 5880.13 37000 0.6 146.5 52.3 60.6 75.6 1.45 0% 0% 0% 7 4 159 96 63 59 4 6% 6496.04 32000 0.1 131.9 40.6 62.7 84.5 1.67 0% 0% 0% 8 4 177 71 106 99 7 7% 3491.27 25000 1.2 64.2 20.0 25.9 30.4 1.40 0% 0% 0% 9 4 116 39 77 64 13 17% 1955.04 23000 9.1 28.7 4.8 16.5 25.8 1.51 0% 0% 0% 10 4 173 71 102 97 5 5% 4375.45 25000 31.3 46.0 14.7 60.1 98.2 2.64 0% 0% 0% 11 4 219 66 153 147 6 4% 5224.22 23000 7.2 62.6 16.0 39.6 61.9 1.98 0% 0% 0% 12 4 145 62 83 83 0 0% 4415.21 24000 2.5 66.3 21.6 33.4 49.3 1.70 0% 0% 0% 13 4 163 49 114 105 9 8% 2304.81 24000 0.5 33.3 12.5 15.8 23.6 1.65 0% 0% 0% 14 4 178 122 56 56 0 0% 5661.48 24000 0.3 77.0 29.2 42.3 55.9 1.92 0% 0% 0% 15 4 122 89 33 33 0 0% 6278.13 25000 0.1 92.2 44.0 47.5 57.0 1.80 0% 0% 0% 16 4 153 88 65 58 7 11% 6594.72 29000 10.1 92.0 25.2 65.8 117.3 2.15 0% 0% 0% 17 4 143 114 29 28 1 3% 10415.0 25000 0.1 83.5 6.1 73.0 172.9 3.07 0% 0% 0% 18 4 174 89 85 84 1 1% 5593.18 24000 1.1 71.3 15.6 40.3 68.0 1.95 0% 0% 0% 19 4 125 83 42 41 1 2% 5646.15 25000 0.1 76.4 20.7 45.4 88.0 2.08 0% 0% 0% 20 4 160 105 55 49 6 11% 5325.32 25000 6.4 64.7 18.0 45.9 71.6 2.30 0% 0% 0% 21 4 120 83 37 33 4 11% 4850.14 27000 0.2 66.7 23.6 42.2 64.0 2.22 0% 0% 0% 22 4 293 214 79 60 19 24% 22502.5 24000 14.0 226.1 107.4 144.3 201.1 2.06 0% 0% 0% 23 4 149 116 33 33 0 0% 19926.2 27000 15.8 251.5 105.6 148.0 195.6 1.90 22% 0% 0% ---- ------ ------ ------ ------ ------ ---- ------- ----- ----- ----- ----- ----- ----- ----- ---- ---- ---- Tots 96 4373 2591 1782 1697 85 5% 217241 29000 124.7 2712 4.8 113.0 329.2 2.35 1% 0% 0% ---------------------------------------------------------------------------------------------------------------------------------
Figure 3-21. CA MICS IBM Hydra Performance Overview
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