try using the bpbkar32 process to write to a null device on the server ,
in this way you will be able to determine if the bpbkar process can
read the data off disk quick enough . If bpbkar can read the data
quicker enough you know you have to start looking at your path to tape.
(doubt it mind you)
 
http://seer.entsupport.symantec.com/docs/242918.htm
 
Dave
 
 

________________________________

From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Rob
Quagliozzi
Sent: 23 October 2006 14:20
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] Backup Speeds



Hi all,

 

I have a Win2k3SP1 file server cluster member that will not back up at
any reasonable kind of speed - it will sometimes kick off at about
12MB/s and can drop as low as 3MB/s (avg is about 5MB/s).  It backs up
over Gbit Ethernet, and so I would expect to be seeing somewhat faster
speeds - I have another server that does not drop below 16MB/s.

 

The policy is split into 3 streams, with multiplex set at 2 (when I set
it to 3 I have Paged Pool errors on the client followed by an OS hang.
(Rectified as of today with a reg key).  Occasionally one of the streams
when it kicks off will sit around about 700K/s (always the same
drive/folders as well) and still be running first thing in the
morning... I've even shuffled the jobs around so that this job is the
only one running for a couple of hours.

 

I've checked all the usual stuff - link speed/duplex (manually set at
1000/Full), virus scan (disabled), windows Open File backups have been
disabled for this client as well, as I was having the odd snapshot
error. 

 

Master server is Win2k3SP1 5.0MP3 with all clients at same level. 2xLTO2
drives in a STK500SL library.

 

Any ideas? I'm stumped - just to add further confusion, both cluster
nodes exhibit the problem to a degree. Argh!

 

Thanks


Rob Q

 

Rob Quagliozzi

Senior Systems Administrator

BlueCrest Capital Management

40 Grosvenor Place

London SW1X 7AW

Tel: 020 7664 3545

robq at bluecrestcapital.com

 


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