At 19:54 +0000 on 01/27/2015, Pommier, Rex wrote about 3494 tape
library with B20 VTS:
Hi all,
I have a couple questions about tape reclamation and statistics. We
have a 3494 tape library that is currently exclusively being used as
physical (stacked) tapes for a 3494-B20 VTS. We're in the process
of migrating off this hardware so we have no new allocations going
to the B20 and subsequently to the 3590 tapes behind it in the 3494.
So as to minimize the churn in the physical tape library, we
essentially have tape reclamation shut off. In looking at the
graphs generated on the 3494 console, I'm not seeing either the
"active data distribution (count of tapes and the percentage of
active data on them)" or the "active data (Gigabytes of active data
in the library)" going down. I know we have taken a significant
amount of data out of the library over the past 30 days, either by
migrating it to our replacement library or by deleting/scratching
logical tapes that we deemed unnecessary.
So my question is this: Should I be seeing these numbers dropping
or will they not drop because I'm not reclaiming tapes?
TIA,
Rex
Since you have multiple logical tapes stacked on each physical tape
volume, what you are seeing is what you should expect so long as you
do not allow the logical tape volumes to be migrated to new physical
volumes. So long as each physical volume has at least one logical
tape on it, it can not be reclaimed. As suggested temporarily turn on
tape reclaim and let the logical tapes migrate by moving them to
other physical tapes. This will allow the volumes with few logical
tapes on them to be completely emptied and thus reclaimed.
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