RE: NTBackup throughput
- From: "Periyasamy, Raj" <Raj.Periyasamy@xxxxxxxxxxxx>
- To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
- Date: Mon, 7 Feb 2005 15:23:35 -0500
Thanks Al.
All used to be well before the upgrade from Win/Exch 2000 to 2003. We
just upgraded to the latest Dell 2850 , dual CPU with 4Gb RAM. We still
use the same Qlogic HBAs and FC4500 SAN. We use Netbackup for nightly
backups. After the upgrades our backup window went from 2hrs to 6hrs. We
are trying to identify what caused this. We thought switching to a disk
to disk backup using NTBackup might throw some light. We are really
baffled on this one. Thanks for your inputs.
Regards,
Raj
-----Original Message-----
From: Mulnick, Al [mailto:Al.Mulnick@xxxxxxxxxx]
Sent: Monday, February 07, 2005 2:38 PM
To: [ExchangeList]
Subject: [exchangelist] RE: NTBackup throughput
http://www.MSExchange.org/
Haven't done this in a while, but IIRC the theoretical limit of the
software
was somewhere at 32GB/hour per store (same as 5.5). So if you have more
than one store at a time, you should be able to attain far more
throughput
(example, 4 SG's being backed up simultaneously ~ 32GB * 4 = 128GB/HR
backup
rate).
Your numbers indicate about 9GB/hr. That's low.
I'm pulling from memory here, but as I recall, there are several factors
that can impact performance:
1) fragmentation: create multiple volumes for the backup target. One
for
each SG you plan to backup at a time. Ex: if you have 3 SG's, create
three
volumes to back these up.
2) disk speeds: both coming and going. E.x. if you have a latency
issues
getting information from disk or writing to disk, you'll see it here.
Verify
that you don't have any bottlenecks in the disks (target and
origination);
RAID configuration plays a part here as well.
3) server resources. If the server is slow, then your backups will be
as
well. If you're backing up on the same server that is running Exchange,
that takes a bigger chunk. If you're backing up during online
maintenance,
that's a bad idea and you should change that. If you're backing up
during
the Index run or during AV background scan, then you should stop that.
If
you are backing up to a drive that is being AV scanned, that can consume
more resources. Etc.
4) if isn't broke, don't fix it :) I have to throw that in there
because
you could be heading down a slippery slope with this. If it works for
you,
leave it alone. If you can't tolerate an all-night backup session, then
you
should look into it.
Al
-----Original Message-----
From: Periyasamy, Raj [mailto:Raj.Periyasamy@xxxxxxxxxxxx]
Sent: Monday, February 07, 2005 1:32 PM
To: [ExchangeList]
Subject: [exchangelist] NTBackup throughput
http://www.MSExchange.org/
List,
How many of us are using NTBackup for backing up the Exchange 2003
Information store in a Disk to Disk backup environment. What is the
throughput I can expect in this environment. My throughputs are not more
than 2.5MB/sec from disk to disk. All disks are SAN attached. I think
this
is way below what I should get.
Thanks
Raj
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