Veritas-bu

Re: [Veritas-bu] HDS Shadow Image & NBU for SQL/Exchange Backups

2008-03-31 13:14:00
Subject: Re: [Veritas-bu] HDS Shadow Image & NBU for SQL/Exchange Backups
From: "Paul Keating" <pkeating AT bank-banque-canada DOT ca>
To: <veritas-bu AT mailman.eng.auburn DOT edu>
Date: Mon, 31 Mar 2008 12:55:10 -0400
Not if your bottleneck is on the IP side. Unless your array is
overloaded, you should be able to read from the Array and write to FC
tape faster than you could dream of backing up off the network.
Plus, if it's Exchange, you can snap it and then back it up cold which
is infinitely faster than using the API.

However, if you're talking limitation of the actual LUN, and the backup
IO hitting the same spindles as the prod volume, then it sounds like
you're talking about HDS COW Snapshot (formerly QuickShadow) rather than
ShadowImage which is a full split plex on separate spindles.

Paul

-- 


> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf 
> Of Martin, Jonathan
> Sent: March 28, 2008 5:17 PM
> To: briandiven AT northwesternmutual DOT com; 
> VERITAS-BU AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] HDS Shadow Image & NBU for 
> SQL/Exchange Backups
> 
> 
> We've got HDS here and we were snapping an AMS 500 and mounting it
> elsewhere for backup.  Are you taking a performance I/O hit while
> backing up?  My 2 cents are - if the backup is slow on 
> whatever storage
> you have presented - its going to be just as slow (or slower) 
> on the 2nd
> set.  

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