Yea, we're examining it now.  Just wanted to see if anyone could provide
some short cuts with some real world experiences.

-- Brian

On 12/14/06, Jones, Courtenay <courtenay.jones at stocksupply.com> wrote:
>
>  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
>
>


-- 
Brian J. Greenberg
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