Veritas-bu

[Veritas-bu] SATA disk backup performance

2007-04-30 11:07:36
Subject: [Veritas-bu] SATA disk backup performance
From: jlightner at water.com (Jeff Lightner)
Date: Mon, 30 Apr 2007 11:07:36 -0400
Right, I misspoke I did indeed mean LUNs.  Don't alternate those for ATA drives 
on CX700 within a RAID Group.

So are you building 1_0 raid groups across buses?

-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu [mailto:veritas-bu-bounces 
at mailman.eng.auburn.edu] On Behalf Of Paul Keating
Sent: Monday, April 30, 2007 10:09 AM
To: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] SATA disk backup performance

Sounds like when you refer to "disk", you mean LUN?
I've never seen a config where you could assign individual "disks" of a
RG over two SPs.
LUNs, sure....

Paul

-- 


> -----Original Message-----
> From: veritas-bu-bounces at mailman.eng.auburn.edu 
> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf 
> Of Jeff Lightner
> Sent: April 28, 2007 8:07 AM
> To: Justin Piszcz; Martin, Jonathan (Contractor)
> Cc: veritas-bu at mailman.eng.auburn.edu; Navarro, Eddy A.
> Subject: Re: [Veritas-bu] SATA disk backup performance
> 
> 
> One thing that will help your performance on CX700.   Be sure 
> each RAID
> group has all its disks bound to a single SP.   We had mistakenly been
> alternating SPA/SPB on the theory that two paths in would increase
> performance.   It turns out that the ATA drives unlike the 
> Fibre drives
> have only one connection so each time you write to the RAID group it
> would have to trespass for every other write.    We modified 
> our config
> to alternate the RAID groups rather than the disks (half the 
> RAID groups
> bound to SPA, the other half bound to SPB) and have seen increased
> performance on tape backups and restores since doing that.
====================================================================================

La version fran?aise suit le texte anglais.

------------------------------------------------------------------------------------

This email may contain privileged and/or confidential information, and the Bank 
of
Canada does not waive any related rights. Any distribution, use, or copying of 
this
email or the information it contains by other than the intended recipient is
unauthorized. If you received this email in error please delete it immediately 
from
your system and notify the sender promptly by email that you have done so. 

------------------------------------------------------------------------------------

Le pr?sent courriel peut contenir de l'information privil?gi?e ou 
confidentielle.
La Banque du Canada ne renonce pas aux droits qui s'y rapportent. Toute 
diffusion,
utilisation ou copie de ce courriel ou des renseignements qu'il contient par une
personne autre que le ou les destinataires d?sign?s est interdite. Si vous 
recevez
ce courriel par erreur, veuillez le supprimer imm?diatement et envoyer sans 
d?lai ?
l'exp?diteur un message ?lectronique pour l'aviser que vous avez ?limin? de 
votre
ordinateur toute copie du courriel re?u.

_______________________________________________
Veritas-bu maillist  -  Veritas-bu at mailman.eng.auburn.edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu


<Prev in Thread] Current Thread [Next in Thread>