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The Shared DASD Analysis Report shown in Figure 2-88 provides
you with a view of the total utilization of each of the DASD
devices by all of the systems in the hardware configuration.
The report details how the performance of the device on each
of the sharing systems compares to the overall average
performance of the device for all systems in the
configuration. Modifications of the report format for MVS/XA
are discussed below. The Shared DASD Analysis Report
contains the following information:
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.
DEV ADR/ The address of the device on the primary system,
DEV NO.: that is, the system defined by the SYSID control
parameter. The same device need not be
designated by the same device address by each
system in the configuration.
For MVS/XA and MVS/ESA this report column is
replaced by the value DEV NO, device number.
VOLSER: The volume serial number of the volume.
DEVICE The device type as carried in the CA MICS
TYPE: DEVTYPE data element.
TOTAL SIO/ The total number of start I/Os (SIOs) or start
TOT SSCH: subchannels issued to the device by all of the
systems in the configuration.
% UTIL: The total utilization of the device by all of
the systems in the configuration. Each system's
utilization is calculated by taking either the
maximum of the device percent busy (DVAPCACT) or
device percent reserved (DVAPCRSV), that is, the
maximum of the percent of time a system used a
device or reserved the device so that other
systems could not access it.
RESP: The average response time (in milliseconds) for
the device for all systems in the configuration.
This value includes both device busy time and
internal queuing for the device. Average
response time is CA MICS data element DVAAVRTM.
SERVICE: The average service time (milliseconds) for the
device for all systems in the configuration.
This value is computed based on the utilization
of the device and the number of SIOs completed.
Average service time is CA MICS data element
DVAAVSTM.
QUEUE: The average internal queuing delay
(milliseconds) before IOS is able to start an
I/O to the system. Queue time is the difference
between device response and service time.
Typically, queue time increases with device
utilization.
For each system that shares the device, one line is produced
with the following format:
SYSID: The SYSID of the system that is to be analyzed
that shares the device.
DEV ADR/ The device address or number by which the device
DEV NO.: is known on the specified SYSID. As was
mentioned earlier, the same device need not be
designated by the same device address by each
system in the configuration. However, in this
example, all of the systems use identical
addresses for each of the devices.
SIO COUNT/ The number of start I/Os or start subchannels
SSCH CNT: issued to the device by the specified SYSID.
% SIO: The percent of the total SIOs issued by the
specified SYSID.
% UTIL: The percent utilization of the device by the
specified SYSID.
AV RESP The average response time (milliseconds) for the
TIME MS: device on the specified system.
R/R: The ratio of the device response time on the
system to the average device response time for
the configuration. Values less than or equal to
one indicate that a system is attempting to
monopolize a device. Values greater than one
indicate that a SYSID is being impacted by the
other systems' utilizations.
AV SERV The average service time (milliseconds) for the
TIME MS: device on the specified system.
R/S: The ratio of the device service time on the
system to the average device service time for
the configuration. Values less than or equal to
one indicate that a system is attempting to
monopolize a device. Values greater than one
indicate that a SYSID is being impacted by the
other systems' utilizations. For a well-
balanced configuration, all systems should
either have values of zero (indicating no
utilization of the device) or values between 0.9
and 1.1.
AV QUE The average internal queue time (milliseconds)
TIME MS: for the device on the specified system.
R/Q: The ratio of the device internal queue time on
the system to the average device internal queue
time for the configuration. Values less than
one indicate that the device is lightly utilized
on the system. Values greater than one indicate
that the internal queuing delay on the system
may be substantial.
CA MICS Performance Manager SHARED DASD ANALYSIS REPORT INTERVAL START: 29SEPyy:08:00 INTERVAL END : 29SEPyy:16:59 DURATION : 9:00:00 DEV DEVICE TOTAL % ---AVERAGE TIME (MS)--- DEV SSCH % % AV RESP AV SERV AV QUE NO. VOLSER TYPE SSCH UTIL RESP. SERVICE QUEUE SYSID NO. COUNT SIO UTIL TIME MS R/R TIME MS R/S TIME MS R/Q ---- ------ ------- ----- ----- ------- ------- ------- ----- ---- ----- --- ----- ------- --- ------- --- ------- --- 104 HSMCTL 3380 414K 23.3 14.7 14.5 0.2 XA01 104 399K 96 21.7 14.6 1.0 14.4 1.0 0.2 0.8 XA02 104 15146 4 1.6 18.6 1.3 16.9 1.2 1.7 7.4 110 PAG303 3380 127K 13.1 29.6 29.6 0.0 XA01 110 127K 100 13.1 29.6 1.0 29.6 1.0 0.0 0.0 XA02 110 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 114 PAG302 3380 272K 24.3 25.9 25.9 0.0 XA01 114 272K 100 24.3 25.9 1.0 25.9 1.0 0.0 0.0 XA02 114 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 120 WORK13 3380 101K 9.2 31.9 27.8 4.1 XA01 120 101K 100 9.2 31.9 1.0 27.8 1.0 4.1 1.0 XA02 120 56 0 0.0 16.4 0.5 16.4 0.6 0.0 0.0 123 TSO805 3380 97510 4.9 11.9 11.3 0.6 XA01 123 79266 81 3.5 12.2 1.0 11.4 1.0 0.8 1.2 XA02 123 18244 19 1.4 10.7 0.9 10.7 1.0 0.0 0.0 132 WORK22 3380 406K 27.5 18.8 17.2 1.6 XA01 132 352K 87 20.4 17.9 1.0 16.7 1.0 1.2 0.8 XA02 132 53388 13 7.1 24.1 1.3 20.3 1.2 3.9 2.4 150 WORK15 3380 83256 6.3 26.2 22.9 3.3 XA01 150 83256 100 6.3 26.2 1.0 22.9 1.0 3.3 1.0 XA02 150 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 160 WORK12 3380 107K 7.9 25.1 23.2 1.9 XA01 160 107K 100 7.9 25.1 1.0 23.2 1.0 1.9 1.0 XA02 160 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 170 WORK14 3380 94524 7.0 24.3 22.8 1.4 XA01 170 94524 100 7.0 24.3 1.0 22.8 1.0 1.4 1.0 XA02 170 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 225 LIBS03 3380 79290 6.1 20.1 18.6 1.5 XA01 225 58820 74 3.6 20.3 1.0 18.7 1.0 1.6 1.1 XA02 225 20470 26 2.4 19.5 1.0 18.5 1.0 1.0 0.7 226 MCAT01 3380 77024 3.2 12.1 11.4 0.6 XA01 226 77024 100 3.2 12.1 1.0 11.4 1.0 0.6 1.0 XA02 226 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 260 GSL802 3380 354K 19.4 18.6 15.9 2.7 XA01 260 354K 100 19.4 18.6 1.0 15.9 1.0 2.7 1.0 XA02 260 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 305 BCSACT 3380 141K 9.5 34.4 19.5 14.9 XA01 305 141K 100 9.5 34.4 1.0 19.5 1.0 14.9 1.0 XA02 305 324 0 0.0 19.3 0.6 19.3 1.0 0.0 0.0 310 WORK11 3380 150K 12.9 31.0 26.3 4.7 XA01 310 150K 100 12.9 31.0 1.0 26.3 1.0 4.7 1.0 XA02 310 10 0 0.0 34.5 1.1 34.5 1.3 0.0 0.0 350 SP3CKP 3380 72184 29.4 30.0 30.0 0.0 XA01 350 55552 77 21.8 26.0 0.9 26.0 0.9 0.0 0.0 XA02 350 16632 23 7.7 43.3 1.4 43.3 1.4 0.0 0.0 56E M33809 3380 236K 14.0 19.5 17.1 2.4 XA01 56E 236K 100 14.0 19.5 1.0 17.1 1.0 2.4 1.0 XA02 56E 0 0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Figure 2-88. MVS/XA Version of Shared DASD Analysis Report
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