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Slow Exchange backups to disk

Updated: 23 May 2010 | 4 comments
Stas Krasovsky's picture
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Hello,
 
I am having some problems with Exchange 2003 backups using GRT. I have a policy setup that backs up the IS to disk and then duplicates it to tape. The duplication works perfect but the backup is very very slow. I have a 164GB Information Store and it takes about 19 hours to backup at a rate of 100MB/Min.
 
The backup server has 2 Raid 5 Arrays. One has 14 10k drives the other has 15 10k drives. Using diskeeper they are at a very low fragmentation so that is not an issue.
 
The backup server and exchange server are on the same Gigabit switch running teamed Gigabit NIC's. Bandwidth shouldn't be an issue.
 
AOFO is turned off as it is not needed for Exchange backups. I am not backing up individual mailboxes. I am not using any kind of Legacy methods. I am not using any compression and I am not using any single instance backup methods.
 
What could possibly be causing such slow backup speeds?

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Ken Putnam's picture
12
Jun
2008
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Hmm, that is about  ~145 MB/min
 
if you just copy a large chunk of data from the Exchange server to the media server how fast does that go?
 
How fast does the Duplicate run?
 
(in other words, is it network related or is it associated with the drive array itself or the media server)
 
 

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Stas Krasovsky's picture
12
Jun
2008
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Yes 145MB/Min for 19 hours but i was averaging the last 10.
 
It looks like it may be a network issue as I tried backing up a single file from the server and it was going at about the same speed.
 
Backups to tape run at 450-500MB/Min
Ken Putnam's picture
12
Jun
2008
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OK if it is a network related slowdown, the first thing to check is that "AutoNegotiate" is NOT enabled on all NICs and switch ports between the two.  Hard set at least one end of each pipe, prefereably both ends

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Stas Krasovsky's picture
16
Jun
2008
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I set them to auto and didnt see a noticeable change file copy speeds..
 
Although the backup ran today at 269MB/Min