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The ASM Page/Swap Activity Report tracks utilization and
response of each page data set found in the RMF SCPPSD Files
over the selected time range. A sample report is shown in
Figure 2-68.
REPORT OPTIONS
The ASM Page/Swap Activity Report supports time, date, zone,
and SYSID selection. The report options determine the level
of the CA MICS database from which the data is selected,
and the "by" value that is used for summarization.
DATA ELEMENTS
The elements reported are divided into three categories:
o Data Set Size
o Data Set Workload
o Data Set Service
DATA SET SIZE
The data set size elements describe the allocation of the
data set or data sets being described. When reporting by
device type or page data set type, the elements in this
section represent a total allocation over the data sets in a
group (that is, over all local page data sets).
AVG SLOTS The average number of slots (or swap sets)
ALLOCATED: allocated to the data set during the reporting
period. When reporting by device type or page
data set type, this value presents an average
profile for all the data sets in this group.
AVG SLOTS The average number of page data set slots (or
USED: swap data set swap sets) in use during this
reporting interval. This value comes from the
PSDAVU element in the SCPPSD File. RMF
calculates this by sampling the Page Activity
Reference or Swap Activity Reference Table each
RMF cycle. When reporting by device type or
page data type, this value presents an average
profile for all the data sets in this group.
MAX SLOTS The maximum number of page slots (or swap sets)
USED: found to be in use on this data set during any
RMF sample. Note that the true maximum value
can occur in between RMF cycles, but it cannot
be smaller than this value. When reporting by
device type or page data set type, this value is
the maximum value found in any of the data sets
included in this total. Investigations in
sizing ASM data sets should always be done using
this report summarized by data set name.
UNUSABLE The number of unusable slots (or swap sets) in
SLOTS: this data set over the last RMF recording
interval of the reporting period.
PERCENT The percentage of slots used over the reporting
SLOTS USED: period. This value is equal to AVG SLOTS USED
divided by AVG SLOTS ALLOCATED, multiplied by
100.
DATA SET WORKLOAD
The data set workload elements describe the work done by a
page/swap data set or by the group of data sets represented
by this report. You can use these elements to identify
situations where more devices are needed, as well as
situations where the device selection algorithm may be
causing a problem. Values in this section represent an
individual data set or a group of data sets, depending on the
reporting option selected.
TOTAL The number of paging I/O requests directed to
PAGING I/O: this page or swap data set or group of page or
swap data sets. Obtained from field IORSION of
the I/O request blocks (IORBs) for this
page/swap data set. Recorded for MVS/SE and
later systems only. For MVS/SP 1.3, this value
includes Resume I/Os (RIOs).
TOTAL The total number of all I/O requests (both
DEVICE I/O: paging and non-paging) directed towards this
device or group of devices. Obtained from
adding together the I/O counts in the HARDVA
File for this device or group devices.
I/O The ratio of the previous two values (paging I/O
CONTENTION versus device I/O) for this device or group of
INDEX: devices. A high value could indicate a
possible problem caused by having non-paging and
paging data sets sharing the same device.
AVG I/O The average Start I/O rate per second for this
RATE: data set or group of data sets during the RMF
reporting interval. This value is only
applicable to SE level MVS and above. For
MVS/SP 1.3, this value includes Resume I/Os
(RIOs). This value is calculated by CA MICS as:
PSDPSIOR=PSDSIO/DURATION
MAX I/O The highest rate of I/O request activity to this
RATE: data set or group of data sets found for any RMF
recording interval included in the reporting time
interval. Recorded for MVS/SE and later systems
only.
AVG PAGE The number of pages transferred per second. This
RATE: element is applicable to "page" data sets only.
AVG PAGE
BURST The number of pages transferred per I/O. This
SIZE: element is applicable to "page" data sets only.
AVG The percentage of time that the ASM (Auxiliary
DATASET Storage Manager) considered this data set to be
UTIL: in use. RMF considers the data set to be in use
if any IORB (I/O Request Block) associated with
the data set is marked as being in use (data sets
on multiple-exposure devices have multiple
IORBs). For the device type or page data set
type options, this is the average utilization of
all data sets in the group. This value is
calculated by CA MICS as:
PSDPCUSE=(100 * PSDUSE) / SAMPLES
MAX The highest percentage "busy" encountered for
DATASET this data set or group of data sets during any
UTIL: RMF recording interval included in the reported
time interval. NOTE: This gives ASM's view of
the data set. IOS's view may be different.
Check the HARDVA Files for device busy. An
indication of this difference will be given by
the difference in the device service time and the
device response time, which is defined below.
DATA SET SERVICE
The data set service elements give a measure of the average
time to handle I/O requests to the page/swap data sets. The
device activity file is used to factor in the device delays
to compute the response time element. The difference between
these two elements gives an indication of shared volume
problems.
NOTE: If you request reports by hour and are using the WEEKS
timespan, the HARDVA File will be tested to make sure the
file is in sequence by hour. If the file is not in sequence
by hour, a warning message will be issued and several
elements will be changed on the report to missing values.
AVG The number of seconds to handle a page or swap
RESPONSE request, including IOS queuing delays. This
TIME/IO: field is calculated by including the I/O queue
delay from the appropriate device activity
files.
AVG The number of seconds required to complete an
SERVICE average I/O to this page (or swap) data set.
TIME/IO: Maintained for MVS/SE or later versions only.
NOTE: Any contention that may cause IOS to queue
ASM's request is not visible to ASM.
AVG The number of seconds required to transfer a
SERVICE page. This element is applicable only to true
TIME/PAGE: "page" data sets (that is, not swap).
NOTE: Any contention that may cause IOS to queue
ASM's request is not visible to ASM.
MAX The highest (worst) average service time for I/O
SERVICE requests found in any RMF recording interval in
TIME: the time covered by this record.
CA MICS Performance Manager HOURLY ASM DATASET ACTIVITY REPORT FOR ZONE = 1 SYSTEM = XA01 RUNDATE = SEP 19, yyyy DSN = SYS1.PAGE109 UNIT = 272 DEVICE TYPE = 3380 PAGE SPACE TYPE = LOCAL -------------------------------------------------------------------------------------------------------------------------------- | | | HOUR/DATE (HR-MM/DD): 00-09/yy 01-09/yy 02-09/yy 03-09/yy 04-09/yy 06-09/yy yy-09/yy 08-09/yy 09-09/yy 10-09/yy CHANGE % | | | |------------------------------------------------------------------------------------------------------------------------------| | | | DATASET SIZE | | ------------ | | | | AVG SLOTS ALLOCATED 45000 45000 45000 45000 45000 45000 45000 45000 45000 45000 --- | | AVG SLOTS USED 4322.00 4213.00 3927.25 2935.00 2834.06 158.00 1186.00 2017.44 2166.50 2945.13 -31.85 % | | MAX SLOTS USED 4657.00 4266.00 4197.00 3609.00 3009.00 334.00 1722.00 2240.00 2401.00 3373.00 -27.57 % | | UNUSABLE SLOTS 0 0 0 0 0 0 0 0 0 0 N/A | | PERCENT SLOTS USED 9.60 % 9.36 % 8.72 % 6.52 % 6.29 % 0.35 % 2.63 % 4.48 % 4.81 % 6.54 % -31.87 % | | | |------------------------------------------------------------------------------------------------------------------------------| | | | DATASET WORKLOAD | | ---------------- | | | | TOTAL PAGING I/O 21 358 331 276 252 29 443 1588 847 2445 1542.85 % | | TOTAL DEVICE I/O 23 408 345 356 254 29 446 1602 849 2447 539.13 % | | I/O CONTENTION INDEX 0.095 0.014 0.004 0.290 0.008 0.000 0.007 0.009 0.002 0.001 -98.94 % | | AVG SIO RATE 0.37 0.10 0.09 0.08 0.08 0.05 0.12 0.44 0.24 0.54 45.94 % | | MAX SIO RATE 0.66 0.15 0.15 0.26 0.11 0.05 0.16 0.77 0.28 0.68 3.03 % | | AVG PAGE RATE 0.81 0.17 0.25 0.12 0.16 0.61 0.62 1.20 0.77 1.43 76.54 % | | AVG PAGE BURST SIZE 2.21 1.68 2.70 1.53 2.12 12.79 5.02 2.72 3.29 2.64 19.45 % | | AVG DATASET UTIL 0.80 % 0.13 % 0.27 % 0.02 % 0.06 % 0.32 % 0.22 % 0.55 % 0.58 % 1.00 % 23.45 % | | MAX DATASET UTIL 1.44 % 0.33 % 0.55 % 0.11 % 0.22 % 0.32 % 0.44 % 1.10 % 0.66 % 1.44 % --- | | | |------------------------------------------------------------------------------------------------------------------------------| | | | DATASET SERVICE | | --------------- | | | | AVG RESPONSE TIME/IO 0.022 0.014 0.030 0.004 0.008 0.069 0.018 0.013 0.025 0.018 -18.18 % | | AVG SERVICE TIME/IO 0.022 0.014 0.030 0.004 0.008 0.069 0.018 0.013 0.025 0.018 -18.18 % | | AVG SERVICE TIME/PAGE 0.010 0.008 0.011 0.002 0.004 0.005 0.004 0.005 0.008 0.007 -30.00 % | | MAX SERVICE TIME 0.011 0.014 0.015 0.003 0.016 0.005 0.005 0.006 0.009 0.009 -18.18 % | | | --------------------------------------------------------------------------------------------------------------------------------
Figure 2-68. Sample Hourly ASM Page/Swap Activity Report
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