Hi All,
Simple question : did any of you succeeded in building a query that would
provide accurate statistics on deduplication and compression factors for the
new TSM directory-based pools ?
I would simply get following :
Stgpool name, space that would be used without dedup & compression, dedup
savings GB , dedup savings %, compression savings GB, compression savings %,
total data reduction GB, total data reduction %
Basically, a "q stg f=d" is able to report such information (with the exception
of space that would be used without dedup & compression), as following example
shows :
Storage Pool Name: DIR_DB2
Storage Pool Type: Primary
Device Class Name:
Storage Type: DIRECTORY
Cloud Type:
Cloud URL:
Cloud Identity:
Cloud Location:
Estimated Capacity: 3,222,437 G
Space Trigger Util:
Pct Util: 0.2
(skipped data)
Deduplication Savings: 7,095 G (31.34%)
Compression Savings: 9,548 G (61.42%)
Total Space Saved: 16,644 G (73.51%)
However, the "stgpools" table is only providing following related fields :
TOTAL_SPACE_MB (which is always empty),SPACE_SAVED_MB,
COMP_SPACE_SAVED_MB,DEDUP_SPACE_SAVED_MB.
What magic does IBM use to be able to display percentages for compression and
dedup in "q stg f=d" output ? So far I could not found it ...
Thanks in advance for any hint !
Cheers.
Arnaud
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