The CA MICS Tape Data Set Summary Report displays a summary
of tape data set information, by volume group (VOLGROUP) for
each tape library system selected.
The report provides average tape data set size and total
estimated storage size for each storage group. Also provided
are the average and maximum ages (since creation) of data
sets within each volume group.
The remainder of the report provides interesting information
about data set usage. For each volume group, the report
lists the number of tape data sets that have been accessed on
some date subsequent to the creation date. This number is
expressed as a percentage of the total number of data sets.
It is interesting to see that in many tape libraries, a
large number of tape data sets are never accessed after
creation. In addition, the ages of many of these data sets
number in the decades. This type of age and usage analysis
can be used to identify tape data sets that should be
deleted, to return volumes to the scratch pool, to reduce
volumes managed, and to reduce expenditures for additional
scratch tapes.
The report heading includes the following general
information:
Report Label Example
------------------ ------------------------------------
report title CA MICS Tape Data Set Summary Report
report granularity Data Summarized by Day
Inquiry TAPLTA
Run Date 10SEPyy
Tape Library Name CA1P
Tape Library Type CA-1
Report Start 09SEPyy:10:24
Report End 10SEPyy:10:24
The data elements used to populate the heading data are:
Report title MICF generated
Report granularity MICF generated
Inquiry MICF generated
Run Date MICF generated
Tape Library Name TAPELIB - Tape Library Identifier
Tape Library Type TLMPROD - Tape Management System Name
Report Start MICF generated
Report End MICF generated
The first line of the report body shows the date of the data
presented in the report. The remainder of the report body
reports on the following measurements from left to right:
Volume Group
o Volume Group - VOLGROUP
Tape Data Set Overall Statistics:
o Data Set Segments - TMDSEGS
o Data Set Count - TMDDSNCT
o Average Segments per Dataset - TMDAVSEG
o Average Data Set Size (MB) - TMDAVSZM
o Approx. Data Set Size (MB) - TMDDSSZM
Note: TMDDSSZM is divided by 1000 to report in GB.
o Average Data Set Age (Days) - TMDAVAGE
o Maximum Data Set Age (Days) - TMDMXAGE
Note: Both age fields are manipulated to show the age in a
YY DDD format on the report.
Tape Data Sets Accessed on Date Subsequent to Creation Date:
o Count of Datasets with Last Usage Date - TMDLUSCT
o Percent of data sets w/last Usage Date - Computed
TMDLUSCT / TMDDSNCT * 100
o Days Since Last Use - TMDLUSE
o Maximum Days Since Last Use - TMDMXLUS
Note: Both age fields are manipulated to show the age in a
YY DDD format on the report.
At the bottom of the report, a TOTALS line shows summary
totals, minimums, maximums, averages, or percentages, as
appropriate for the detailed data in each column.
Report data is generated from the DAYS timespan of the Tape
Data Set (TMCTMD) file.
To produce the report:
o Enter the CA MICS Workstation Facility (MWF)
o Choose option 2, CA MICS Information Center Facility
(MICF)
o Choose option 2, Database Inquiries
o Select TAPLTA, whose Catalog Group is STORAGE
o Complete the MICF Execution panel
o Complete the specification panel. Refer to section
3.1.1, TLM MICF Inquiry Specification Panels, for
information about modifiable panel fields.
Tape Data Set Summary Report (TAPLTA) Report Sample
-----------------------------------------------------------
The following report sample shows summary tape data set
statistics for a site that has used the volume group
(VOLGROUP) data element to classify tape data in three
categories:
Media Type 1: Large tape data sets on real cartridges
Media Type 2: Smaller tape data sets on real cartridges
Virtual Tape: Data sets stored in the virtual tape system
The report displays overall characteristics of the data, and
can be used to track compliance with the management goals
associated with each tape media type.
In this sample, it is clear that virtual tape is widely
used for smaller data sets with lower average retention
periods. It is interesting to note that less than 1% of
virtual tape data is accessed on a date subsequent to
creation. An argument could be made to set the default
retention time for virtual tape data sets to a lower value
since such a small number of virtual tape data sets are
re-accessed subsequent to their creation.
Inquiry : TAPLTA Tape Data Set Summary Report Run Date: 11JuLyy Information Summarized by Day Page 001 Tape Library Name: TLB1 Report Start: 02JULyy:14:05 Tape Library Type: RMM Report End : 03JULyy:14:05 ---------------------------------------------------------------------------------------------------------------------------------- Day: 03JULyy ---------------Tape Data Set Overall Statistics--------------- -----Tape Data Sets Accessed on Date----- Avg Avg Subsequent to Creation Date Segs DSet Est Avg Max Subseqnt Subsq Avg Dur Max Dur Data Set Data Set per Size Storage DSet Age DSet Age Accessed Accss Last Accss Last Accss Volume Group Segments Count DSet (MB) Size(GB) YY / DDD YY / DDD Count Pct YY / DDD YY / DDD ---------------- -------- -------- ---- ------ -------- -------- -------- -------- ------ -------- -------- Media Type 1 32 24 1.33 655.8 15.74 6 / 308 10 / 38 4 16.7% 5 / 117 5 / 352 Media Type 2 10054 9526 1.06 322.1 3068.20 9 / 169 21 / 73 1029 10.8% 9 / 275 21 / 66 Virtual Tape 700801 682001 1.03 110.6 75396.78 0 / 195 11 / 299 3286 0.5% 1 / 353 9 / 307 ---------------- -------- -------- ---- ------ -------- -------- -------- -------- ------ -------- -------- TOTALS 710887 691551 1.03 113.5 78480.72 0 / 240 21 / 73 4319 0.6% 3 / 301 21 / 66 ----------------------------------------------------------------------------------------------------------------------------------
Figure 3-2. Tape Data Set Summary Report
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