Do Q STGPOOL and look for %MIGR, "per cent migratable".
If %MIGR is less than %UTIL, then there are chunks in the pool that aren't
eligible and can't be migrated out yet, because there are transactions in
progress (usually a backup still running).
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Shawn DREW
Sent: Thursday, February 14, 2013 11:20 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Odd Migration Behaviour
Do you have a migration delay setting on the disk pool by any chance?
Regards,
Shawn
________________________________
Shawn Drew
> -----Original Message-----
> From: ADSM-L AT VM.MARIST DOT EDU [mailto:ADSM-L AT VM.MARIST DOT EDU]
> Sent: Thursday, February 14, 2013 5:41 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] Odd Migration Behaviour
>
> Hi
>
> TSM Server v6.3.1
>
> Some odd behaviour when migrating a disk pool to tape
>
> The disk pool (devicetype=disk) is 6tb in size and has approximately 2.5tb of
> data in it from last nights backups.
>
>
> I backup the stgpool, it copies 2.5tb to tape. Fine with this
>
> I mig stgpool lo=0 maxpr=3. Start fine.
>
> (I do not use a duration parameter)
>
> First migration finishes after a few minutes, migrating 500mb. Lower than i
> expected, i guess Second migration finishes after 30 minutes, migrating
> 138gb.
> Third migration finishes after 1.5 hours, migrating 819gb
>
> But the pool now shows about 24% utilised, so still about 1.5tb of data
> remaining
>
>
> The tape pool the migrations are writing to has colloocation=group specified.
> I have three collocgroups, containg approximately 250 nodes. All of the
> nodes on the server are within these 3 groups I noticed that one of the
> clients was still backing up. It's a slow backup, always has been. That node
> is
> in one of the collocgroups.
> When that client backup completed, i ran migration again with lo=0 and it is
> now beyond 1tb and still running. Pct utilisation of the disk pool is now down
> to 10%
>
>
> So, because the backup of that node is still running, will that prevent
> migration from migrating data from that specific collocgroup while a backup
> of a client within that group is in process?
>
> Any comments welcome.
>
> Regards
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