Cool idea!
-----Original Message-----
From: Tab Trepagnier [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 16, 2001 6:45 PM
To: [EMAIL PROTECTED]
Subject: Re: TAPEPOOL Pending Volumes
Wanda,
We used to use a Reuse=0 on our main libraries also, but that got just a
little bit scary during reclamations. Now we run with Reuse=2 on main
libraries and Reuse=5 on Copypool (tapes go to vault semi-weekly).
The issue we were concerned with was that once a tape was emptied via
reclamation, it immediately became a candidate for reuse. Very soon
(minutes in some cases) new data would get written to the newly-emptied
tape. But the *SM database had not yet been saved so there was no record
of the data's new location. Should the server crash in such fashion as to
require a DB restore, the data locations saved in the DB would NOT match
the physical locations on tape and that data effectively was lost in the
main pools.
When we've run out of scratch tapes in our main libraries, we'd do an
incremental DB backup followed by a Backup Volhist. Then set Reuse=0 until
the pending tapes toggle to scratch - usually only takes a few minutes.
Once those tapes are scratch, we set Reuse back to "2".
That way, should we suffer a crash requiring a DB restore, when the DB
restore was finished, the DB and physical locations of the data would be in
sync.
Tab Trepagnier
TSM Administrator
Laitram Corporation
"Prather, Wanda" <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 08/16/2001
01:13:49 PM
Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc:
Subject: Re: TAPEPOOL Pending Volumes
FWIW, I keep REUSEDELAY set to 8 on my copy pool, but set to 0 for the pool
in the library, which avoids your problem. I figure if anything disastrous
happens, it's the copy pool tapes I'll need, anyway.
That may not necessarily work for everybody; but here, COPY POOL tapes are
made daily and sent to the vault, so the pools are (almost) always in sync.
-----Original Message-----
From: Martin, Jon R. [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 16, 2001 12:36 PM
To: [EMAIL PROTECTED]
Subject: TAPEPOOL Pending Volumes
Because of capacity we are having a hard time maintaining scratch tapes in
our library. I thought of the following and would appreciate any feedback
on it's pros and cons.
Much like a copypool tape is kept offsite until it's "Delay period for
reuse" has expired I was considering checking my TAPEPOOL pending volumes
out of the library until they completed their reuse period. Currenltly our
reuse period has been temporarily set to 3 days and even with that there
are
usually 10 slots in the library occupied by pending volumes. I realize
that
for this to work it would need to be done daily but the alternative
problems
are worse.
Any thoughts?
Jon Martin
