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Source: HSMVOL file at the DETAIL timespan
VCAVOA file at the DETAIL timespan
Function: This facility reports the effectiveness of HSM in
managing the DASD volumes under its control. The
reports produced will enable you to determine when
HSM parameters need to be adjusted, and when
volume pool changes need to be made. Up to 10
different reports can be generated from this
facility, and each report may be generated in
tabular or graphic format. Color graphics are
also supported. These reports monitor such items
as the results of daily space management, the
excess data occupancy that exists on your volumes,
the frequency and success rate for interval
migration, and other usage statistics for your
DASD and HSM resources.
The data used for these reports is gathered
directly from HSM by the daily run of the CA MICS
DASD Space Collector. It represents a view of
your storage resource as seen by HSM and, as such,
may have results that are slightly different from
other StorageMate reports. Be advised that HSM
will only generate statistics for a volume if HSM
activity occurred that day for that volume. This
means that the amount of data produced for low
activity days will be less than for busy days.
Keep this in mind when viewing such metrics as
total storage capacity, as these values may tend
to change slightly from day to day. Some reports
may also show no activity because of the values of
your HSM options. For example, the values for
interval migration will always be zero if you have
specified no interval migration.
Features: Depending on the reports selected, most of the HSM
statistics can be summarized by volume, HSM volume
type (primary or migration), or volume group (SMS
storage group). Because storage group is not kept
in the HSM data, these values are extracted from
the VCAVOA file and merged with the HSM data to
create the final report.
All reports can be produced as tabular reports,
printer graphics reports or color graphics
reports.
SMS
Issues: Users planning for SMS could use these reports to
tune HSM and determine the optimum HSM thresholds
when defining SMS management classes. After SMS
implementation has begun, the reports should be
used on an ongoing basis to make sure adequate
space exists in each storage group, and to make
sure HSM is managing each storage group as
designed.
ELEMENT DESCRIPTIONS
Chart types
Up to four different types of charts can be
generated by this facility:
Migration Effectiveness
This chart reports the effectiveness of HSM
daily space management activities. Different
chart versions can be produced to report by
volume, volume type, and/or volume group.
Excess Occupancy Analysis
This chart reports the amount of space
occupied by data sets that did not migrate,
but could migrate if necessary. Different
chart versions can be produced to report by
volume, volume type, and/or volume group.
Interval Migration Activity
This chart reports the number of times HSM
started interval migration, and the number of
times it was effective. Different chart
versions can be produced to report by volume,
volume type, or volume group.
Total Capacity Analysis
This chart shows capacity and usage values on
a daily basis. It can be used to monitor the
capacity and occupancy of all the volumes
known to HSM.
While only one chart example is shown in this
section, all four chart types will be described.
Common Elements
The following elements are common to most of the
charts produced:
SYSID
The System Identifier to which this data
applies.
Volume Serial Number (Volume)
HSM Volume Type (Level)
Volume Group (VolGrp)
Identifies the type of summarization
requested. This represents summarization
based on individual volume, HSM volume type
(0=primary or 1=migration) or volume group
(SMS storage group). The alternate values
shown in parentheses appear when using color
graphics.
Date
Identifies the date associated with the values
on the chart, shown as 'ddmmmyy'.
Migration Effectiveness
The following descriptions apply to the charts
produced to show HSM Migration Effectiveness:
Occupancy Before Daily Space Management
Represents the percentage of the volume or
volume group that was allocated before HSM
daily space management began.
Occupancy After Daily Space Management
Represents the percentage of the volume or
volume group that was allocated after HSM
daily space management completed. The
differences in these two values shows the
percentage of the volume or group freed by
HSM.
Excess Occupancy Analysis
The following descriptions apply to the charts
produced to analyze Excess Occupancy:
Storage Capacity in Megabytes
Represents the total storage capacity of the
volume or volume group expressed in
megabytes.
Allocated Space in Megabytes
Represents the amount of space on the volume
or volume group that was allocated after HSM
daily space management completed. The
difference between the Capacity value and the
Allocated value represents free space.
Excess Occupancy Space in Megabytes
Represents the amount of space, in megabytes,
allocated by data sets that HSM did not
migrate, but could have migrated if more free
space were still required. As this value
moves closer to zero, the ability for HSM to
guarantee free space on this volume or group
is reduced.
Interval Migration Activity
The following descriptions apply to the charts
produced to analyze Interval Migration:
Total Interval Migrations
Represents the number of times HSM started
interval migrations for this volume or volume
group. Interval migrations are started at a
user- specified interval if the free space on
a volume has dropped below a user-specified
value.
Failed Interval Migrations
Represents the number of times that HSM
interval migration was started, but the
interval migration could not free enough
space to meet a user-specified value.
Excessive numbers of interval migrations and
failed migrations indicate a potential space
shortage or a threshold value in that may be
incorrect.
Total Capacity Analysis
The following descriptions apply to the charts
produced to analyze Total Capacity:
Total Capacity (Primary and Level 1)
Represents the total storage capacity of all
the volumes known to HSM, whether those
volumes are primary or Level 1 migration
volumes. This value is reported in
megabytes.
Capacity of Primary Volumes
Represents the total storage capacity of all
the primary volumes known to HSM, reported in
megabytes. The difference between this value
and the Total Capacity value would indicate
the capacity of the HSM Level 1 migration
volumes.
Total Allocated (Primary and Level 1)
Represents the amount of space, in megabytes,
allocated by data sets that reside on either
primary volumes or HSM Level 1 migration
volumes.
Allocated on Primary Volumes Only
Represents the allocated space for those data
sets residing only on primary volumes known
to HSM, reported in megabytes. The
difference between this value and the Total
Allocated value indicate the space allocated
by data sets on HSM Level 1 migration
volumes.
DAILY HSM DASD USAGE (STGEJC) CA MICS StorageMate ABC CORPORATION Migration Effectiveness SYSID=IMS8 Volume Serial Number=TST035 | | 100 + 96 + 92 + B B 88 + B 84 + A B 80 + B B B B B B B B B 76 + A A A A A B 72 + A A A A A A A P 68 + A e 64 + r 60 + c 56 + e 52 + n 48 + t 44 + a 40 + g 36 + e 32 + 28 + 24 + 20 + 16 + 12 + 8 + 4 + 0 + | | -----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---- 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 D D D D D D D D D D D D D D D D D D D D D D D D E E E E E E E E E E E E E E E E E E E E E E E E C C C C C C C C C C C C C C C C C C C C C C C C 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 Date A = OCCUPANCY AFTER DAILY SPACE MANAGEMENT B = OCCUPANCY BEFORE DAILY SPACE MANAGEMENT
Figure 4-24. Daily HSM DASD Usage / Chart
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