We have 2 storage pools, one for small clients and one for large ones. We use 
9840 tapes so any client with less than 12 gb of stored backups goes on the 
small pool. We
save about 40 tapes this way.

Guillaume Gilbert
CGI Canada




brian welsh <brianwelsh3 AT HOTMAIL DOT COM>@VM.MARIST.EDU> on 2003-02-19 
15:42:51

Veuillez répondre à "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

Envoyé par :      "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


Pour : ADSM-L AT VM.MARIST DOT EDU
cc :
Objet :     Question about collocation on/off

Hello,

AIX 5.1, TSM 4.2.2.8 en 3494 ATL with 700 volumes (used about 620 volumes),
and about 300 nodes. Three months ago we turned collocation off because we
have about 200 client-nodes with less then 3 GB's data stored, and every
node was using min. 1 tape, so we had a lot of tapes with low utilization,
long migration.

Now tape-utilization is much better, migration is much faster, but yesterday
there was a restore of an web-server (WinNT) and we restored almost 2 GB and
it took 6 hours and there were almost 70 tape-mounts.

Before we set collocation off such restores took half an hour. Now we are
thinking of setting collocation back on, but that implies we have to buy and
checkin about 350 new tapes, because move data will take weeks or more.

Now I was wondering how other sites are dealing with collocation, and what
are they doing to get better results during restore, when collocation is
off.

We are thinking of make a full back-up once a month to get data of one
client on less (or one) tape(s), or putting collocation back on, or...

Curious to your reaction!

Thanx,

Brian.








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