I was under the impression that reclamation only affected full volumes,
not filling ones.  I have had backups fail because of lack of space when
% utilization was relatively low but % migratable was high.  I checked
the reclaim stgpool help info and it does not say it excludes filling
tapes.  Am I just wasting time and delaying expiration/reclamation with
the move data process?  Maybe TSM is so easy to administer I'm just
trying to make it more interesting?

Confused,
Jim

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT vm.marist DOT edu] On Behalf Of
Shawn Drew
Sent: Thursday, March 10, 2011 12:22 PM
To: ADSM-L AT vm.marist DOT edu
Subject: Re: [ADSM-L] Does Move Data recover space on virtual volumes?

Why wouldn't normal reclamation be used for this?  It's the automatic
"move data" intended to consolidate empty space.
As long as expiration is running on both source and target server space
will be reclaimed.


Regards,
Shawn
________________________________________________
Shawn Drew





Internet
jschneider AT USSCO DOT COM

Sent by: ADSM-L AT VM.MARIST DOT EDU
03/10/2011 11:15 AM
Please respond to
ADSM-L AT VM.MARIST DOT EDU


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Subject
Re: [ADSM-L] Does Move Data recover space on virtual volumes?






Yes.

I use 'move data' to consolidate virtual filling volumes and reduce 'Pct
Migr' in the storage pool.  Judging by the time taken to move data,
empty space is not moved.  After the data is moved off of the volume it
becomes a scratch volume.

Jim Schneider

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT vm.marist DOT edu] On Behalf Of
Keith Arbogast
Sent: Thursday, March 10, 2011 10:08 AM
To: ADSM-L AT vm.marist DOT edu
Subject: [ADSM-L] Does Move Data recover space on virtual volumes?

We are running TSM 6.2.2.2 on RHEL 5.

It is my understanding that all the space used by a virtual volume is
kept until every file on it has been expired. Virtual volumes don't
shrink in size, just like physical cartridges, even though their
pct_utilization may go down. Therefore, if some file in a virtual volume
never goes inactive, that virtual volume will live forever and all its
space be indefinitely unreclaimable.

Are my starting point, and its consequences correct? If not, please
correct my misunderstanding.

If virtual volumes with expired files don't shrink, does 'move data' on
a virtual volume recover empty space like it does on a physical
cartridge?  Or, does the empty space get moved too?

Move data is not an efficacious solution to this problem. Is there a
better one?

With my thanks,
Keith Arbogast
Indiana University



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