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Source: VCADAA file at the DETAIL timespan
HSMMIG file at the DETAIL timespan
Tape library information (external)
Function: Monitors your users' allocation and use of
Generation Data Groups (GDGs).
The report allows analysis of generation data set
allocation and usage patterns, and detects
potential problems, such a duplicate or missing
generations.
Features: User reports have three levels of summarization--
detail, base name, and data set prefix.
This report is summarized by the GDG Base Name.
The report also provides usage information, such
as the total amount of space allocated to
generation data groups at the installation.
If you are establishing or revising your standards
related to the number of generations that will be
retained, this report can help that process by
allowing you to simulate the effects of using
differing values.
This report provides a broad overview of GDG usage
by individual users or departments. This will be
useful when tracking GDG usage and allocation
patterns at a high level, and will also quickly
identify potential problems. More detailed
information about individual problems can then be
produced by rerunning the report at a lower level
of detail.
Limits: VSAM data sets cannot be included in this report,
because the GDG structure is not supported in VSAM
environments.
SMS
Issues: Users installing SMS can determine the number of
generations of a GDG that are being kept online.
This is important, because the SMS Management
class can be used to control the number of
generations that will be kept online, and the
action to take when older generations "roll off".
COLUMN DESCRIPTIONS
Prefix
Lists the high-level data set name node (prefix)
that is summarized on this line of the report.
All generation data groups starting with this
prefix will be summarized here.
# Of GDGs
The number of unique generation data groups (GDGs)
that were found in the data being scanned having
this prefix.
Min # Gen
The smallest number of generations found in any of
the GDGs having this prefix. Low values such as 1
could indicate a potential problem, as only one
copy of a particular group of data exists.
Max # Gen
The largest number of generations found in any of
the GDGs having this prefix. High values indicate
potential abuse of space, as many generations of
similar data are being kept online.
Avg # Gen
The average number of generations being kept by
all of the GDGs having this prefix. This is
calculated by dividing the total number of
generation data sets in this group by the total
number of GDGs.
GDGs with Dups
The number of GDGs found with this prefix that
contained duplicate generation numbers. For
example, a value of 1 would indicate that one GDG
with this prefix had one or more duplicate
generations. Any value greater than zero
indicates a potential problem caused by duplicate
uncataloged generations.
GDGs with Gaps
The number of GDGs found with this prefix that
contained gaps in the generation numbers. For
example, a value of 1 would indicate that one GDG
with this prefix had at least one gap in its
generation numbers. Any value greater other than
zero indicates a potential problem caused by
missing generations.
Min # Vol
The minimum number of volumes used by the GDGs
with this prefix to store all of the generations
of the same group. For example, a value of 2
indicates that all of the GDGs with this prefix
have their generations spread across at least two
volumes. A value such as 1 could warn of a
potential data loss, because all generations of a
group would be lost if that volume were lost.
Max # Vol
The maximum number of volumes used by the GDGs
with this prefix to store all of the generations
of the same group. For example, a value of 8
indicates that at least one of the GDGs with this
prefix has generations spread across eight
volumes. A high value could warn of a large
number of generations being kept online, which
wastes space.
Avg # Vol
The average number of volumes used by the GDGs
with this prefix to store all of the generations
of the same group. This is calculated by dividing
the sum of the number of unique volumes used by
each GDG by the number of GDGs. Low values tend
to indicate potential data loss problems, while
high values often indicate wasted space.
Max MB Alloc
The maximum amount of space allocated, expressed in
millions of bytes (megabytes), by the GDGs with
this prefix. This value reports the one GDG within
this group that is using the largest amount of
space.
Avg MB Alloc
The average amount of space allocated, expressed
in millions of bytes (megabytes), by each of the
GDGs having this prefix. This is calculated by
dividing the space allocated by all of the
generation data sets with this prefix by the
number of GDGs.
Total MB Alloc
The total amount of space allocated, expressed in
millions of bytes (megabytes), by all of the
generation data sets having this prefix.
Simulated Space Savings - Data Sets Moved
The number of data sets having this prefix that
would have been rolled off the system based on the
simulation values coded on the report option
screen. This feature allows you to simulate the
effects of keeping only a certain number of
generations of each GDG online.
Simulated Space Savings - MB Saved
The amount of space, expressed in millions of
bytes (megabytes) that would be released by
causing certain generations having this prefix to
be rolled off the system based on the simulation
values coded on the report option screen. This
feature allows you to simulate the effects of
keeping only a certain number of generations of
each GDG online.
GDG MANAGEMENT AND RETENTION (STGEFE) 11 CA MICS StorageMate - PREFIX REPORT ABC CORPORATION ----------------------------------------------------- System Identifier=TST1 ----------------------------------------------------- Prefix # Min Max Avg GDGs GDGs Min Max Avg Max Avg Total +--- Simulated Space Savings ---+ Of # # # with with # # # MB MB MB Data Sets Moved MB Saved GDGs Gen Gen Gen Dups Gaps Vol Vol Vol Alloc Alloc Alloc CBM00T 6 1 2 2 0 0 1 2 2 0.0 0.0 0.0 0 0.0 CIS00T 4 1 2 1 0 0 1 2 1 0.1 0.0 0.1 0 0.0 DAB10P 1 1 1 1 0 0 1 1 1 0.2 0.2 0.2 0 0.0 DCI 1 1 1 1 0 0 1 1 1 3.2 3.2 3.2 0 0.0 DCI10P 2 1 1 1 0 0 1 1 1 0.2 0.2 0.3 0 0.0 DCR6770 1 3 3 3 0 0 2 2 2 0.8 0.8 2.5 0 0.0 DMS 2 1 2 2 0 0 1 2 2 0.1 0.0 0.1 0 0.0 DPS00T 31 1 3 2 0 3 1 3 2 28.3 3.8 241.5 0 0.0 LNS00T 29 1 3 2 0 2 1 3 2 5.2 1.0 58.8 0 0.0 SMF 1 1 1 1 0 0 1 1 1 0.7 0.7 0.7 0 0.0 SMS 3 1 1 1 0 0 1 1 1 0.8 0.8 2.5 0 0.0 SSU 27 1 2 1 0 5 1 2 1 240.5 12.2 401.5 0 0.0 TESTCIF 1 1 1 1 0 0 1 1 1 0.0 0.0 0.0 0 0.0 TESTDCI 3 1 1 1 0 0 1 1 1 0.0 0.0 0.1 0 0.0 TESTDDA 37 1 2 1 2 1 1 2 1 4.8 0.2 9.8 0 0.0 TESTDKN 1 1 1 1 0 0 1 1 1 6.3 6.3 6.3 0 0.0 TESTSMS 1 1 1 1 0 0 1 1 1 138.0 138.0 138.0 0 0.0 TSTC 1 10 10 10 1 1 6 6 6 0.1 0.0 0.3 5 0.2 TSTD 2 5 6 6 1 1 3 4 4 0.0 0.0 0.1 1 0.0 -------- ----- ---- ---- -------- ------ -------- 154 4 13 866.1 6 0.2
Figure 4-37. GDG Management and Retention / by Prefix
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