1) No, they are only backed up once. (Assuming of course, that your BACKUP
STGPOOL command specified the same destination copy pool both times.).
BACKUP STGPOOL is an incremental backup; TSM checks the DB to decide whether
any file in the primary pool does or does not already exist in the copy
pool, and only makes a copy if there isn't already one in the copy pool
2) We back up the disk pool first, just because my primary pool is
collocated, so if I can backup the files while they are still on disk it
saves oodles of tape mounts to create the copy pool, which is not
collocated. Whether you do disk or tape first doesn't really matter, if you
know for sure no migration will occur in between.
Whether or not you disable sessions depends on how precise you want to be
with your offsite copies. If you want to guarantee, that EVERYTHING is
represented in your copy pool then yes, disable sessions, backup from disk
to tape, then tape to tape, then back up the DB. In my case, with 500
machines backing up per day, I don't bother disabling sessions, 'cause I
don't have a large enough free window, and anything I miss on day one, will
surely make it to the offsite pool on day 2.
Wanda Prather
The Johns Hopkins Applied Physics Lab
443-778-8769
[EMAIL PROTECTED]
"Intelligence has much less practical application than you'd think" -
Scott Adams/Dilbert
-Original Message-
From: Lee, Gary D. [mailto:[EMAIL PROTECTED]]
Sent: Monday, March 26, 2001 10:35 AM
To: [EMAIL PROTECTED]
Subject: backing up storage pools
My hierarchy consists of two disk pools, both of which migrate to a single
3590 tape pool. My questions are as follows:
1. If I backup the disk pools, then after some time they migrate and I
backup the tape pools, how are the migrated files handled? i.e. are they
backed up twice?
2. Based on the answer to one, what is the order in which you folks are
doing storage pool backups, and should I disable sessions while this is
going on?
TIA for any insite.
Gary Lee
Senior Operating Systems Analyst
Ball State University
phone 765-285-1310
