Yes, you can do it that way: set maxscratch=0 and manually define tapes.
Yes, collocation will behave with a less than ideal number of tapes, placing
multiple clients per tape. What I don't know is if will be smart about tape
mounts in that situation. I'm guessing it won't be smart.
I would add one wrinkle to your environment to ensure you don't get the
dreaded, Server out of data storage space message as you consume all of your
tapes. Create a second tape pool and make it the target of the first pool's
nextstg parameter and set the migration threshold to 99%. That way, if you
should run out of space, a simple migration process will start. Once you
detect this has happened, you can simply add volumes to your first pool and
issue move data commands on the volumes in the second pool.
The trick is in the analysis of what the correct number of tapes is. You're
on the right track.
Kelly J. Lipp
Storage Solutions Specialists, Inc.
PO Box 51313
Colorado Springs CO 80949-1313
(719) 531-5926
Fax: (240) 539-7175
Email: [EMAIL PROTECTED] or [EMAIL PROTECTED]
www.storsol.com
www.storserver.com
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of
Paul Baines
Sent: Friday, January 26, 2001 3:59 AM
To: [EMAIL PROTECTED]
Subject: Question about collocation.
Hello,
We are running a 3494 library serving, among others, some 1400 NT servers.
These servers occupy on average 2 Gb in a non-collocated storage pool. We
want/need to switch on collocation at a node level for these clients, but I
don t
want to let them collocate on 1400 30-50Gb 3590s. How do people manage the
use of their collocated storage pools? Do you set maxscratch=0 and just
define
volumes to the storage pool? What if I ve got 1400 clients and 300 tapes?
Does collocation work properly if you limit the number of tapes?
If I have 2700Gb and 2Gb per client then :
5 clients / tape 10 Gb / tape = 270 tapes
6 clients / tape 12 Gb / tape = 225 tapes
7 clients / tape 14 Gb / tape = 192 tapes
8 clients / tape 16 Gb/ tape = 168 tapes
9 clients / tape 18 Gb / tape = 150 tapes
10 clients / tape 20 Gb / tape = 135 tapes
OK, these are idealised averages, but how are you doing it? How full or how
many clients do you have on collocated storage pool tapes?
Ta in advance for any comments,
Paul.
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