Gilbert,
Is there a particular reason you have such a large library with just two
drives? I have a 3583 with four drives. I did that to prevent the very
problem you're reporting.
Assuming it hosts a primary storage pool, you will need two drives for
reclamation unless you use a FILE devclass disk pool as a reclaim pool.
Then you can turn one two-drive process into two one-drive processes with
a buffer in between them.
If you also might be doing reclamation of your copypool(s) - a situation I
sometimes see on my system - you will need a third drive.
A fourth drive reserves one drive for "outgoing" data to clients. That is
why I put four drives in all four of my tape libraries.
My 3583 connected HV Diff SCSI gives a sustained 12 MB/s per drive. That
works out to about 43 GB/hour minus "bubbles" from when the tape is being
repositioned.
Tab Trepagnier
TSM Administrator
Laitram Corporation
Guillaume Gilbert <[EMAIL PROTECTED]>
Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
07/03/2002 08:40 AM
Please respond to "ADSM: Dist Stor Manager"
To: [EMAIL PROTECTED]
cc:
Subject: Reclaiminig LTO Tapes
Hey there
Maybe its because I'm used to using STK 9840 tapes but yesterday I saw an
LTO tape at 25 % utilisation take almost 4 hours to reclaim, which to me
is awful. How am I
supposed to reclaim my tapes with that kind of performance?. The drives I
use are IBM Ultriums in a 3584 library. With only 2 drives it makes it
hard for users to do
restores...
Are there any options I can change to make this go a bit faster. I know
the start/stop on LTO's isn't good.
Thanks for the help.
Guillaume Gilbert
CGI Canada
