I kinda had the same issues, only 6 tape drives & 250Gb of diskpool
space and a lot of servers to backup.
What I did, which works for us, is all the Exchange & SQL jobs go direct
to tape, they're the biggest in terms of Gb, the rest are staggered to
diskpool.
The Big Exch & SQL jobs are allowed 2 mount points, never more than 1 of
those jobs running at a time.
The Exch & SQL jobs have a higher priority than diskpool migration just
in case there's ever contention for tape drives.
The diskpool is set to migrate at 70% and allowed 4 mount points, lower
limit set to 25%
Before the DB get backed up in the morning the diskpool gets flushed to
tape.
Our setup is such that data is on disk for as short a time as possible,
this suits us as our TSM backups aare predominantly for DR. Recovering
data users have "disappeared" is done via Snapshots.
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
John Naylor
Sent: 17 August 2005 13:20
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] HELP!!!! Migrations taking too long and pools
filling up!
Joni,
Looks like you were unlucky and got hit by some extra large backups,
which filled up your disk pool faster than it could be emptied I assume
this is what caused a lot of backups to be delayed, by media wair.
In truth it does sound as if you need more or faster tape drives.
That aside what I do in a tape constrained environment is to run
overnight with a diskpool high migration set at 40% and a lo of 20% You
may want to experiment with these values.
I also run concurrent to that hourly triggered backups of the disk
storage pool to a tape copy pool In effect I use 3 drives overnight .
It does mean that I am doing tape to tape pool copies during the day but
I have more drives available then.
This in not perfect but it works for me
John
Joni Moyer <joni.moyer AT highmark DOT com>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT vm.marist DOT edu>
17/08/2005 12:40
Please respond to
"ADSM: Dist Stor Manager" <ADSM-L AT vm.marist DOT edu>
To
ADSM-L AT vm.marist DOT edu
cc
Subject
HELP!!!! Migrations taking too long and pools filling up!
Hello Everyone!
Due to our tape drive shortage I have added a tremendous amount of disk
to hold the data for 24 hours. It appears as if now it is taking a very
long time for the disk pools to migrate to tape and processes are still
backing up and causing contention with backups of the client data
sometimes of up to 10 hours. How can I resolve this issue so that the
clients receive a quick backup and do not have I/O contention? I
thought that adding more disk would help because the landing spot for
the data is now a larger disk pool that can house all of the data, but
it seems like it's hitting it's 70% full mark and when I came in this
morning the disk pool was up to 95% full, there are many clients that
are waiting to write their backups and everything is locked up. Any
suggestions would be appreciated! I don't know what to do for this
environment any longer and I am not allowed to buy tape drives. Thank
you in advance!
********************************
Joni Moyer
Highmark
Storage Systems
Work:(717)302-6603
Fax:(717)302-5974
joni.moyer AT highmark DOT com
********************************
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