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The DASD Multiple Volume Analysis Report allows you to select the volumes that have the minimum possible contention to avoid performance problems. Figures 2-115 and 2-116 show typical inquiry panels for the multiple volume analysis report and plots. Groups of up to four devices can be mapped together through the specification of 2, 3, or 4-way mapping as a parameter on the inquiry panel. The default method is the pairing of devices. Be very careful to ensure that all volumes being analyzed have a complete set of data from each system they are shared to.
/------------------- IOA DASD Multiple Volume Analysis Report ------------------\ | Command ===> | | | | Composing CA MICS Inquiry: IOA34 - DASD Migration Study | | | | Time-span ===> DAYS (DETAIL/DAYS) Cycle(s) ===> 01 - 03 | | Data base ===> B (PRIMARY) _ _ _ _ | | Allow Run-Time Override of Data Base ===> N (Y/N) and/or Cycle(s) ===> N (Y/N) | | | | Num of VOLs to be combined ===> 2 (2/3/4) Plot contention index ===> Y (Y/N) | | | | Volume table method: ** Specified ** : Least active method: | | Analyze or Monitor ===> A (A/M) : Device type ===> _____ (3350/3380) | | Analyze unlike VOLs ===> N (Y/N) : Num of VOLs ===> ___ (1-100) | | Specify volume table ===> Y (Y/N/R) : | | | | Data Selection: Allow run-time override | | Date ===> _______ - _______ _______ - _______ ===> N (Y/N) | | Hour ===> 08 - 17 __ - __ __ - __ ===> N (Y/N) | | Zone ===> _ _ _ _ _ _ _ _ _ ===> N (Y/N) | | Sysid ===> ____ ____ ____ ____ ____ ____ ===> N (Y/N) | | | | Specify extended options ===> N (Y/N) | | | \-------------------------------------------------------------------------------/
Figure 2-115. IOA DASD Multiple Volume Analysis Report Inquiry Panel A description of the inquiry fields is presented in Section 2.4.6.4.1 in the discussion on component operation. If you code Y (Yes) in the Specify volume table field, the Volume Serial Number Table panel is displayed. This panel allows you to code up to 100 volumes, keeping in mind that the number of volumes should match with the 2, 3, or 4 way mapping you have requested (e.g., you specified if 3-way mapping, then the number of volumes should be divisible by 3).
/-------------------------- Volume Serial Number Table -------------------------\ | Command ===> | | | | Inquiry Step: IOA Multiple DASD Volume Analysis | | | | Volume serial numbers (Max 100 in any order) | | ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ | | PACK01 PACK02 PACK03 ______ XXXACC XXXACT ______ ______ ______ ______ | | BSDIS1 BSDIS3 BSDIS4 ______ BSDS01 BSDS02 BSDS05 BSDS06 ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ | | | \-------------------------------------------------------------------------------/
Figure 2-116. Volume Serial Number Table Panel
The DASD Multiple Volume Analysis Report for the inquiry
field entries that are shown above is shown in Figure 2-117.
The following items are shown in the figure:
INTERVAL The time and date of the first HARDVA File
START: observation included in the analysis.
INTERVAL The time and date of the last HARDVA File
END: observation included in the analysis.
DURATION: The total number of hours summarized by report,
rounded up to the nearest hour.
VOLSER1: The volume serial number of the first disk
volume to be mapped onto the device.
DEVICE The device type of the first disk volume to be
TYPE1: mapped onto the device.
VOLSER2: The volume serial number of the second disk
volume to be mapped onto the device.
DEVICE The device type of the second disk volume to
TYPE2: be mapped onto the device.
VOLSER3: The volume serial number of the third disk
volume to be mapped onto the device. This will
be displayed only when 3-way or 4-way mapping is
specified.
DEVICE The device type of the third disk volume to be
TYPE3: mapped onto the device. This will be
displayed only when 3-way or 4-way mapping is
specified.
VOLSER4: The volume serial number of the fourth disk
volume to be mapped onto the device. This will
be displayed only when 4-way mapping is
specified.
DEVICE The device type of the fourth disk volume to be
TYPE4: mapped onto the device. This will be displayed
only when 4-way mapping is specified.
AVERAGE The average of the product of the device busy
PRODUCT: values (DVAPCACT) for the volumes for all of the
hours processed. The average product value is
defined as the contention index in the technique
tutorial (Section 2.4.6.2). This value is the
sum of values for all SYSIDs included in the
analysis.
MAXIMUM The maximum sum of the device busy values
SUM: (DVAPCACT) for the volumes for any of the
hours processed. This value is the sum of all
SYSIDs included in the analysis.
We recommend that no volumes be combined that have a maximum
sum value greater than 30 percent.
The software can make no assumptions concerning technological
improvements that may tend to decrease device busy values as
may be the case when the device types being mapped are of a
different type than those volumes you are migrating to.
If you specify the optional plot reports, a plot of the sum
of the device busy values for each of the hours will be
produced for any volume serial grouping that has an average
product of greater than 5 or a maximum sum of greater than
25. A sample plot report is shown in Figure 2-118. The
purpose of these plots is to allow you to verify that a low
average product value is not the result of a group of volume
serial numbers that are zero, except for one or two hours
that have a high contention index.
The plots present the sum of the device busy values of the
recommended groupings of volume serial numbers (VOLSER
grouping) for each hour of every day specified on the inquiry
panel. Two values of this sum are plotted:
o The sum of the device busy values when all device
busy values were greater than zero. This variable
(data element SUM1PCBS) is plotted using
alphabetical characters.
o The sum of the device busy values. This variable
(data element SUM2PCBS) is plotted using
asterisks. In the event that all of the groups were
non-zero and less than 100, these characters will be
hidden by the alphabetical characters. If the values
exceeded 100, SUMPC1BS will be set to 100 and SUMPC2BS
will be set to 110.
CA MICS Performance Manager
DASD MULTIPLE VOLUME ANALYSIS
INTERVAL START: 27DECyy:08:02
INTERVAL END : 27DECyy:17:59
DURATION : 09:00:00
SYSIDS : SYSA SYSB SYSC
DEVICE DEVICE AVERAGE MAXIMUM
VOLSER1 TYPE1 VOLSER2 TYPE2 PRODUCT SUM
------- ------ ------- ------ ------- -------
BSDS02 3350 BSDS05 3350 0.01 1.33
BSDIS1 3350 BSDS01 3350 0.03 2.42
BSDIS4 3350 BSDS06 3350 0.05 4.58
PACK03 3350 XXXACT 3350 2.52 9.48
PACK02 3350 XXXACC 3350 65.90 50.31
Figure 2-117. IOA DASD Multiple Volume Analysis Report
CA MICS Performance Manager >> SUM1PCBS: VOL1 BUSY + VOL2 BUSY WHEN BOTH ARE >0 << >> SUM2PCBS: VOL1 BUSY + VOL2 BUSY << >> SUM1PCBS>100 ==>100, SUM2PCBS>100 ==>110 << PACK02 /XXXACC PLOT OF SUM1PCBS*HOUR LEGEND: A = 1 OBS, B = 2 OBS, ETC. PLOT OF SUM2PCBS*HOUR SYMBOL USED IS * SUM1PCBS | | | 80 + | | 70 + | | 60 + | | 50 +A | | 40 + | A A | A A 30 + A A | A | 20 + A A A | A A | A A A A 10 + B A B |A A |A A A 0 + A B A B | | | -+----------+----------+----------+----------+----------+----------+----------+----------+----------+ 8 9 10 11 12 13 14 15 16 17 HOUR OF DAY
Figure 2-118. Plot of DASD Contention Index
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