Hi Rod!
TSM stores backups as aggregates. An aggregate can contain multiple
client backup files. The client files within an aggregate will expire
over time and thus occupy space within the aggregate.
When you use a file device class or a tape, you can reclaim the wasted
space these expired files occupy within the aggregates by moving
unexpired files to new aggregates. This is done through reclamation.
Since reclamation is only available for sequential acces storage pools,
you cannot reclaim diskpools and thus the wasted space within an
aggregate will only be reusable when all the files in an aggregate are
expired and the aggregate is deleted. If you have backups with a very
long retention in your shop, it could take quite some time before an
aggregate becomes completely empty.
Hope this clears thing up for you.
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Park, Rod
Sent: donderdag 6 april 2006 15:31
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Random Access Disk Pools

 anyone? Ideas?

-----Original Message-----
From: Park, Rod
Sent: Wednesday, April 05, 2006 7:10 AM
To: 'ADSM: Dist Stor Manager'
Subject: RE: [ADSM-L] Random Access Disk Pools

So, can someone explain the difference at the TSM level and aggregate
level. Really I'm trying to understand, if I have a primary disk pool
that does not migrate, it will be the final onsite resting place of
data. As data expires and fragmentation occurs. That space is unusable
if I'm not migrating to another primary area? Eventually I'll have to
allocate more? Below is what comparison doc showed as "consideration of
fragmentation" for random access pools. Guess I'm not sure what the diff
is between tsm level and aggregate level.

TSM level - fragmentation will occur as TSM allocates and frees space
within the Storage Pool.  Migration tends to relieve this fragmentation

Aggregate level - fragmentation occurs as files expire within an
aggregate.  DISK pools cannot reclaim this wasted space until all files
in the aggregate have expired

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Rushforth, Tim
Sent: Tuesday, April 04, 2006 11:21 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Random Access Disk Pools

See http://www-1.ibm.com/support/docview.wss?rs=0&uid=swg21218415 for
comparison of disk vs devclass=file




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