Before the "SATA Sux" crowd gets going here I'll just say this:
 
I run 14 x 5 SATAII 500GB Disks in a Raid 5 and get better than
200MB/sec writes and easily drive LTO3 to 130MB/sec.  That said, I'm
running completely different hardware, Dell server & storage.  Raid 5,
qlogic HBAs & PERC Raid Controllers.
 
The best thing anyone on this list ever said to me when I was in your
shoes was forget about Netbackup.  How fast can you copy data from point
a to point b on your solution?  Then how fast can you multistream FTPs
to the same solution?  Once you get those numbers into the range you are
expecting then you can start to performance tune NBU.  Until then, your
buffer settings are a waste of time.
 
-Jonathan

________________________________

From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Navarro,
Eddy A.
Sent: Friday, April 27, 2007 5:10 PM
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] SATA disk backup performance



Gurus,

 

I've been doing some performance testing of backing up to a Disk Storage
Unit of SATA disk.  We have the following:

 

Netbackup 5.1 MP6

SunFire V800 running Solaris 9 with 8GB RAM

Veritas Volume Manager 4.1

CX700 array with 500GB 7200rpm SATA drives

Emulex LP9000 HBA

 

I've been doing all sorts of tweaking, from adjusting the disk buffer
files per http://seer.entsupport.symantec.com/docs/273532.htm, cranking
up the write cache on the CX700 to over 2GB, changing the RAID layouts,
but I just cannot get performance better than 15MB/s.  Surely backing up
to SATA can produce better results than that?

 

Currently, I've got six 500GB LUNs each in their own 4+1 RAID group
using RAID3.  These LUNs are then striped into a RAID0 volume using
Veritas Volume manager (at first I tested with a striped MetaLun on the
array, but results were no different).

 

As stated, I've tweaked till I'm blue in the face but I can't seem to
squeeze anything above 15MB/s.  Any hints as to what I could be
overlooking?  Performance is not looking good compared to our NDMP
backups to LTO-2 tape which run at the nice clip of ~35MB/s.

 

Thanks,

Eddy

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