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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.
COLUMN DESCRIPTIONS
Report types
Up to four different types of reports can be
generated by this facility:
Migration Effectiveness
This report shows the effectiveness of HSM
daily space management activities. Different
report versions can be produced to summarize
the data by volume, volume type, and volume
group.
Excess Occupancy Analysis
This report monitors the amount of space
occupied by data sets that did not migrate,
but could migrate if necessary. Different
report versions can be produced to summarize
the data by volume, volume type, and volume
group.
Interval Migration Activity
This report shows the number of times HSM
started interval migration, and the number of
times it was effective. Different report
versions can be produced to summarize the data
by volume, volume type, and/or volume group.
Total Capacity Analysis
This report 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 report example is shown in this
section, all four report types will be described.
Common Elements
The following elements are common to most of the
reports produced:
SYSID
The System Identifier to which this data
applies.
Volume Serial Number
HSM Volume Type
Volume Group
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).
Date
The left-most column of each report will list
the date associated with the values shown on
that report line. The date is shown in the
format 'ddmmmyy'.
Migration Effectiveness
The following descriptions apply to the reports
produced to show HSM Migration Effectiveness:
Occupancy % Before Migration
Represents the percentage of the volume or
volume group that was allocated before HSM
daily space management began.
Occupancy % After Migration
Represents the percentage of the volume or
volume group that was allocated after HSM
daily space management completed.
Percentage Freed
Represents the percentage of the volume or
group freed by HSM daily space management.
Excess Occupancy Analysis
The following descriptions apply to the reports
produced to analyze Excess Occupancy:
Percentage Excess Occupancy
Represents the percentage of the volume or
group allocated by data sets that HSM did not
migrate, but could have migrated if more free
space were still required. Large values here
are good, as they represent excess space that
could be freed if needed.
Percentage Not Eligible
Represents the percentage of the volume or
group allocated by data sets that HSM cannot
migrate, as they don't meet the migration
thresholds. Small values here are good, as
they represent only a small number of data
sets that HSM could not move if necessary.
Percentage Unallocated
Represents the percentage of the volume or
group currently available for new data set
allocations. Large values here are good, as
they represent unused capacity. The sum of
these three percentage columns should equal
100%.
Total Capacity (MB)
The total storage capacity of this volume or
volume group, expressed in megabytes.
Interval Migration Activity
The following descriptions apply to the reports
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.
Successful Interval Migrations
Represents the number of times that HSM
interval migration was successful, meaning
that it was able to free enough space on the
volume or group to meet a user-specified
threshold.
Percentage Migrations Successful
The percentage of interval migrations for
this volume or group that were successful.
This is calculated using the values in the
two previous columns.
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/or 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 reports
produced to analyze Total Capacity:
Primary Volume Count
The number of primary volumes found in the
input data for this particular system. As
previously mentioned, this value may vary,
depending on the level of HSM activity for a
given day.
Primary Capacity (MB)
Represents the total storage capacity of all
the primary volumes included in this
analysis. This value is reported in
megabytes.
Percent of Primary Allocated
Represents the percentage of total primary
capacity that was allocated by data sets
residing on those primary volumes.
Level 1 Volume Count
The number of HSM Level 1 migration volumes
found in the input data for this particular
system. As previously mentioned, this value
may vary, depending on the level of HSM
activity for a given day.
Level 1 Capacity (MB)
Represents the total storage capacity of all
the HSM Level 1 migration volumes included in
this analysis. This value is reported in
megabytes.
Percent of Level 1 Allocated
Represents the percentage of total Level 1
capacity that was allocated by data sets
residing on those Level 1 HSM volumes.
TOTAL Volume Count
The combined number of primary volumes and
HSM Level 1 migration volumes found in the
input data for this particular system. As
previously mentioned, this value may vary,
depending on the level of HSM activity for a
given day.
TOTAL Capacity (MB)
Represents the total storage capacity of all
the primary and HSM Level 1 migration volumes
included in this analysis. This value is
reported in megabytes.
Percent of TOTAL Allocated
Represents the percentage of total primary
and Level 1 capacity that was allocated by
data sets residing on those volumes.
DAILY HSM DASD USAGE (STGEJC) CA MICS StorageMate ABC CORPORATION Excess Occupancy Analysis --------------------------------------------- SYSID=IMS8 Volume Serial Number=TST068 ---------------------------------------------- Date Percentage Percentage Percentage Total Excess Not Unallocated Capacity Occupancy Eligible (MB) 07DEC07 27.0 42.0 31.0 1892 08DEC07 27.0 42.0 31.0 1892 09DEC07 27.0 42.0 31.0 1892 10DEC07 28.0 41.0 31.0 1892 11DEC07 14.0 55.0 31.0 1892 12DEC07 14.0 54.0 32.0 1892 13DEC07 14.0 55.0 31.0 1892 14DEC07 14.0 55.0 31.0 1892 15DEC07 13.0 55.0 32.0 1892 16DEC07 13.0 55.0 32.0 1892 17DEC07 11.0 58.0 31.0 1892 18DEC07 11.0 58.0 31.0 1892 19DEC07 11.0 58.0 31.0 1892 21DEC07 14.0 55.0 31.0 1892 22DEC07 15.0 54.0 31.0 1892 23DEC07 9.0 60.0 31.0 1892 26DEC07 12.0 57.0 31.0 1892 28DEC07 12.0 57.0 31.0 1892 29DEC07 12.0 57.0 31.0 1892 30DEC07 17.0 52.0 31.0 1892
Figure 4-25. Daily HSM DASD Usage / Summary
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