ADSM-L

Effect of multiple migration processes to a collocated pool - serial or parallel node migration ?

2003-07-30 06:28:16
Subject: Effect of multiple migration processes to a collocated pool - serial or parallel node migration ?
From: PAC Brion Arnaud <Arnaud.Brion AT PANALPINA DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 30 Jul 2003 12:28:10 +0200
Hi list,

A quickie one : when migrating multiple nodes data from non-collocated disk 
pool to collocated tape pool, using migproc=2, in which order will data be 
migrated ?
1) node 1 data on 2 different tapes, then node 2 data on 2 different tapes etc 
....
2) node 1 data on one tape and node 2 data on another tape, then node 3 data on 
another tape etc ....

I would tend to say 1) is the right response, as the order of nodes processed 
is per largest amount of data in the disk storage pool, but wanted to make it 
sure ...
If my assumption is right, is there any way achieving  parallel mounts for 
nodes migration (option 2)  instead of serial mounts (option 1) ? This would 
avoid waste of tapes (2 tapes created for 1 node migrated, in a collocated pool 
looks strange  to me), and also from time (tape reclamation will probably 
recombine those tapes to a new one after a while)
Thanks in advance !
Regards.

Arnaud

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