Re: [Veritas-bu] Exchange 2003 Information Store Backup Slow

We too use 262144 buffer size with 9940B’s, and achieve in excess of 50mb/sec on exchange backups, albeit on HDS.

The blocksize limitation is a windows 2003 SP1 issue that is overcome by installing hotfix 873422, we too use the STK driver and needed this hotfix to overcome the limitation.

Dave

From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Paul Keating
Sent: 31 July 2007 14:57
To: Kevin Whittaker; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Exchange 2003 Information Store Backup Slow

Those 9940B drives should be good for a 262144 buffer size, unless there's still some windows limitation....though I believe that limitation was for the built in windows driver.

you should be fine with the STK driver, though you'd obviously want to do some testing.

Can you get a report of your current disk layout from the disk fairies?

RAID layout? Number of spindles? Dedicated RAIDsets? Number of paths? etc, etc?

Paul

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Kevin Whittaker
Sent: July 31, 2007 9:39 AM
To: WEAVER, Simon (external); veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Exchange 2003 Information Store Backup Slow

Yes, when we speed it up we played with the buffer settings.

# of buffers is set at 64, size is 32768.

When I started this 6 months ago, they said only professional services could help me. But I will say that the guy that came in did help, because before it was talking 23 hours to backup. With the multiple streaming of the information stores, buffer changes, and installing the STK tape drivers for windows instead of the Veritas ones, we saw improvements.

I was talking with the disk fairies and they are going to relay out the disks for the exchange servers. They are saying, from what they are seeing, this will also help with the read performance. I will just have to wait for them and be patience.

Kevin

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