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Re: [Veritas-bu] Destaging going slow

2010-06-25 07:16:23
Subject: Re: [Veritas-bu] Destaging going slow
From: Ed Wilts <ewilts AT ewilts DOT org>
To: WALLEBROEK Bart <Bart.WALLEBROEK AT swift DOT com>
Date: Fri, 25 Jun 2010 06:14:52 -0500
On Thu, Jun 24, 2010 at 10:19 PM, WALLEBROEK Bart <Bart.WALLEBROEK AT swift DOT com> wrote:

Even when we fully format the DSSU disk and we then run 1 backup job to this disk and directly afterwards we duplicate it to tape we get these speeds (35-40MB/sec).  So at that time no fragmentation at all is involved.

We saw the same thing.  Again, a dd of the file to tape went fast.   A destage of the same file to the same tape drive went slow.  This was repeatable on multiple Solaris and Windows servers.  It's not a disk subsystem configuration or load issue.   If it was fragmentation or a raid configuration issue, the dd should also have been slow.


Ed Wilts, RHCE, BCFP, BCSD, SCSP, SCSE
ewilts AT ewilts DOT org
 

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