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For this case study, we used the DASD Skew Analysis Report inquiry to analyze the device strings on an IBM 3081-K running MVS/XA. We selected a one-hour period for the study. The CA MICS database unit that contained the installation's hardware data was denoted by database identifier B. The inquiry fields for the study are shown in Figure 2-108.
/------------------------ IOA DASD Skew Analysis Report ------------------------\ | Command ===> | | | | Composing CA MICS Inquiry: IOA28 - DASD Skew Analysis Case Study | | | | Time-span ===> DETAIL (DETAIL/DAYS) Cycle(s) ===> 01 - 01 | | Data base ===> B (PRIMARY) _ _ _ _ | | Allow Run-Time Override of Data Base ===> N (Y/N) and/or Cycle(s) ===> N (Y/N) | | | | Report by time interval ===> N (Y/N) | | | | Data Selection: Allow run-time override | | Date ===> _______ - _______ _______ - _______ ===> N (Y/N) | | Hour ===> 10 - __ __ - __ __ - __ ===> N (Y/N) | | Zone ===> _ _ _ _ _ _ _ _ _ ===> N (Y/N) | | Sysid ===> SYSA ____ ____ ____ ____ ____ ===> N (Y/N) | | | | Specify extended options ===> N (Y/N) | | | | | | | | | | | \-------------------------------------------------------------------------------/
Figure 2-108. Case Study - IOA DASD Skew Analysis Report Inquiry Panel The DASD Skew Analysis Report produced from these inquiry fields is shown in Figure 2-109. You should examine the coefficients of variation and skewness to determine the skewness of any string that represents a path utilization of more than five percent. Pay particular attention to low activity service-sensitive volumes like database volumes.
CA MICS Performance Manager 13:08 WEDNESDAY, DECEMBER 19, yyyy DASD SKEW ANALYSIS - DAYS LEVEL INTERVAL START: 15NOVyy:09:52 INTERVAL END : 15NOVyy:10:52 DURATION : 1:00:05 SYSID : SYSA CU / AV LCU TOTAL TOTAL TYPE CV / PATH LCU SERV MS SSCH RTE % HOS LINE DEV 1 DEV 2 DEV 3 DEV 4 DEV 5 DEV 6 DEV 7 DEV 8 SKEW ----- ---- ------- -------- ------- -------- ------- ------- ------- ------- ------- ------- ------- ------- ------- 1A0-0 0005 10.26 33.2 34.08 DEV NO. 1A0 1A1 1A2 1A3 1A4 1A5 1A6 1A7 --SEE-- * DLS * SSCH RT 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.3 -BELOW- ANY TWO AV SERV 30.63 0.00 37.06 0.00 0.00 0.00 0.00 21.60 DEVICES % PATH 0.12 0.00 0.00 0.00 0.02 0.00 0.00 0.21 CAN BE VOLSER WORK21 XTG001 BENSC2 FYQ001 WORK30 WORK31 PIANO1 WMN017 ACTIVE STGGRP N/A N/A N/A N/A N/A N/A N/A N/A DEVTYPE 3380J 3380J 3380J 3380J 3380J 3380J 3380J 3380J 1A0-0 0005 -------SEE ABOVE------- DEV NO. 1A8 1A9 1AA 1AB 1AC 1AD 1AE 1AF 2.14 * DLS * SSCH RT 0.0 0.0 0.0 31.5 0.0 0.1 0.0 1.1 1.36 ANY TWO AV SERV 0.00 0.00 0.00 22.16 0.00 10.21 0.00 22.48 DEVICES % PATH 0.00 0.00 0.00 32.96 0.00 0.02 0.00 0.76 CAN BE VOLSER PIANO5 FAT1B9 CIS001 FAT1BB FAT1BC FAT1BD FAT1BE TECSYS ACTIVE STGGRP N/A N/A N/A N/A N/A N/A N/A N/A DEVTYPE 3380J 3380J 3380J 3380J 3380J 3380J 3380J 3380J 1B0-0 0005 9.30 15.7 14.60 DEV NO. 1B0 1B1 1B2 1B3 1B4 1B5 1B6 1B7 --SEE-- * DLS * SSCH RT .15 0.4 0.0 0.4 0.1 0.0 3.3 0.0 -BELOW- ANY TWO AV SERV 10.78 22.82 0.00 23.73 15.84 18.48 16.26 16.53 DEVICES % PATH 0.32 0.53 0.00 0.21 0.02 0.00 0.80 0.00 CAN BE VOLSER WORK22 WORK26 WORK23 CH0100 PIANO2 PIANO4 BES003 BES001 ACTIVE STGGRP N/A N/A N/A N/A N/A N/A N/A N/A DEVTYPE 3380J 3380J 3380J 3380J 3380J 3380J 3380J 3380J 1B0-0 0005 -------SEE ABOVE------- DEV NO. 1B8 1B9 1BA 1BB 1BC 1BD 1BE 1BF 2.25 * DLS * SSCH RT 10.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.13 ANY TWO AV SERV 24.30 0.00 48.81 0.00 0.00 0.00 0.00 0.00 DEVICES % PATH 12.71 0.00 0.02 0.00 0.00 0.00 0.00 0.00 CAN BE VOLSER WMN003 WMN004 IPN001 WMN006 PIANO3 IPN002 CS0101 PIANO6 ACTIVE STGGRP N/A N/A N/A N/A N/A N/A N/A N/A DEVTYPE 3380J 3380J 3380J 3380J 3380J 3380J 3380J 3380J 1C0-0 0006 3.51 30.2 10.56 DEV NO. 1C0 1C1 1C2 1C3 1C4 1C5 1C6 1C7 --SEE-- * DLS * SSCH RT 0.0 0.0 0.1 0.1 0.5 8.5 2.1 0.6 -BELOW- ANY TWO AV SERV 15.81 0.00 38.00 27.63 15.84 18.48 16.26 16.53 DEVICES % PATH 0.00 0.00 0.11 0.08 0.10 3.30 0.41 0.15 CAN BE VOLSER SPL007 SPL008 WMN025 WMN026 WJEP03 WJEP04 FEJ000 DLIB23 ACTIVE STGGRP N/A N/A N/A N/A N/A N/A N/A N/A DEVTYPE 3380J 3380J 3380J 3380J 3380J 3380J 3380J 3380J 1C0-0 0006 -------SEE ABOVE------- DEV NO. 1C8 1C9 1CA 1CB 1CC 1CD 1CE 1CF 1.24 * DLS * SSCH RT 0.0 0.0 3.0 0.0 12.0 1.3 0.0 2.1 1.69 ANY TWO AV SERV 20.60 28.42 31.04 35.61 19.62 17.51 0.00 21.04 DEVICES % PATH 0.00 0.00 1.90 0.00 3.29 0.32 0.00 0.90 CAN BE VOLSER TEC003 WJEP18 IPN004 MICS02 FAT25C FAT25D WNM012 WNM013 ACTIVE STGGRP N/A N/A N/A N/A N/A N/A N/A N/A DEVTYPE 3380J 3380J 3380J 3380J 3380J 3380J 3380J 3380J
Figure 2-109. Case Study - DASD Skew Analysis Report
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