My understanding of an NDMP differential backup is that TSM assumes the backup 
will be the full size of the filesystem at the beginning of the backup, and 
places it accordingly.  If that's the case, then that isn't true, because the 
backup of the other large filesystem on that NAS goes to disk, and it's a 5TB 
filesystem with 4TB of data.

--
Cameron Hanover
chanover AT umich DOT edu

"A computer once beat me at chess, but it was no match for me at kick boxing."
--Emo Philips

On May 15, 2010, at 5:00 AM, Remco Post wrote:

> On DISK type storage, TSM can't split a transaction over multiple volumes, 
> you need FILE type storage to be able to do that. Since NDMP dumps are a 
> single transaction.....
> 
> 
> On 14 mei 2010, at 17:29, c.hanover wrote:
> 
>> Our setup:
>> TSM 5.4.1.2 Server on Linux, a 19TB disk pool dedicated to the management 
>> class for the NAS node. The disk pool is largely made up of 1.8TB volumes on 
>> a RAID5, the maxfilesize is set to 'nolimit', highmig=100, lowmig=99.  The 
>> NAS is a BlueArc, according to the trace:
>> NAS Vendorname:     BlueArc Corp.
>> Productname:    Silicon Server NDMP.
>> Revisionnumber: 6.1.
>> Hosttype:    BOS.
>> Versionnumber: 6.1.
>> 
>> The filesystem in question:
>> fsName=/__VOLUME__/cifpilot1, fsType=WFS, fsId=2, fsCap=10Tb, fsOcc=8650Gb
>> 
>> When I perform a backup of that filesystem (backup node 
>> XXXXXXXXXXXXX.umich.edu /__VOLUME__/cifpilot1 toc=yes mode=diff), rather 
>> than go to the empty disk pool, it immediately goes to tape.  This is 
>> causing a problem because the job is getting preempted when the scheduled 
>> migrations occur on the other servers at 7am.  Other smaller filesystems 
>> (0.4 and 5TB, respectively) backup to disk just fine.
>> I've moved the backup as early as I could to try and get it to complete 
>> before migrations, but that's not working anymore.  I need to figure out why 
>> this backup is going to tape rather than to disk.
>> 
>> Anybody have any ideas?
>> 
>> -
>> Cameron Hanover
>> chanover AT umich DOT edu
>> 
>> "Necessity is the plea for every infringement of human freedom.  It is the 
>> argument of tyrants; it is the creed of slaves."
>> --William Pitt, House of Commons, 11/18/1783
> 
> -- 
> 
> Met vriendelijke groeten/Kind regards,
> 
> Remco Post
> 
>