Have you tried using the EMC performance guide for the Celerra and
backup software? 
We were able to increase our performance quite a bit following their
recommendations.
 
We were getting 90MB/sec but we have a couple of Clarions....
 

Regards,

-cj
Courtenay Jones
SBS Unix Admin



 

________________________________

From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Brian J.
Greenberg
Sent: Thursday, December 14, 2006 4:35 PM
To: veritas-bu-admin at mailman.eng.auburn.edu;
veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] Celerra NDMP tuning for NBU


Has anyone tried doing any performance tuning with NDMP for NBU?

I was testing from a RAID0 (3 disk set) on internal 10K disk and
couldn't get above 119MB/sec (no tuning).  I ran test to /dev/null and
only got up to about 120GB/sec so my testing needed to move to something
with faster disk and I/O. 

I decided to try to get better read speeds from the DMX we have on a
Celerra we have for testing via NDMP.  This should give me the 2Gb Fiber
Channel speeds along with the better performance disk and cache.
Incidentally, most of our data is on NAS so NDMP is the only real
option.   

My testing environment:


*       NBU 6.0 MP4 
*       LTO-3 physical & virtual drives (just to test the differences in
performance) 
*       Cisco SAN - fabric 2Gb (not oversubscribed) 
*       EMC NSX Celerra ( 5.5 code) with EMC DMX3-24 fiber channel 10K
146GB disks in a RAID5 config (yes, I realize that the RAID level is
what might be killing my performance but I'm hoping the cache will at
least off-set this). 
*       Data: contrived files that are 50MB in size and compressible by
4.3:1 written sequentially totaling more than 500GB in total data.

The environment is running the default NDMP settings on the Celerra.
Anybody have any recommendations for tuning the NDMP config on the
Celerra [ e.g. buffer size, etc.] to get closer to the 150+ MB/sec rates
that I should be seeing?  Perhaps config changes elsewhere?

Brian J. Greenberg


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