ADSM-L

Re: [ADSM-L] continuous restore from multiple cartridges

2010-04-06 09:25:55
Subject: Re: [ADSM-L] continuous restore from multiple cartridges
From: "Allen S. Rout" <asr AT UFL DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 6 Apr 2010 09:24:11 -0400
>> On Tue, 6 Apr 2010 07:14:52 -0400, Richard Sims <rbs AT BU DOT EDU> said:


> On Apr 6, 2010, at 2:34 AM, Mehdi Salehi wrote:


>> A client is to restore something from multiple cartridges
>> (regardless of being collocated or not). Server mounts the first
>> cartridge and the restoration process starts . Does TSM server
>> prepare (mount) the next cartridge before it is actually needed if
>> there are enough tape drives in the library?

> No.  One would think that would be an administrative option in the
> product, but has not been.  The apparent intention is to limit the
> number of drives that a client will have in use, regardless of
> actual availability of drives.



If you're in the "not collocated" case, you can sometimes save time by
running a 'MOVE NODEDATA'.

make a temporary DISK or FILE stgpool,  and

MOVE NODEdata [targetnode] FROMSTG=[your primary tape pool]
TOSTG=[temp stg] MAXPROC=[whatever]

where 'whatever' is the number of drives you intend to devote to the
process.


This will cost you startup time, in that you won't be able to start
the restore until the move is done.  But it will save you time in the
long run as you can mount lots of tapes simultaneously.

You probably want at least three drives in on the move data, but 'as
many as you can spare' is a good idea.


- Allen S. Rout

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