Snapshots are "cool" and they're great for many things, but as you mentioned
they have a small foot print.  That's because it's just the pointers to the
original data and any changed data made throgh a "copy-on-write" process.

It will help if you drop a table accidentally or need to roll-back to the way
things used to look before that bad batch job.

If there is actually corruption of the data the pointers are just pointing to
bad data.  It won't help your recovery in this case!


- Scott



                                                                                
                                                   
                    Chris Brewer                                                
                                                   
                    <cgbrewer AT rmbsc DOT com>                 To:     "'Rick 
Keahey'" <rickkeahey AT hotmail DOT com>                          
                    Sent by:                             cc:     veritas-bu AT 
mailman.eng.auburn DOT edu                                 
                    veritas-bu-admin AT mailman DOT eng.        Subject:     
RE: [Veritas-bu] Disk to Disk Backups                        
                    auburn.edu                                                  
                                                   
                                                                                
                                                   
                                                                                
                                                   
                    03/06/2002 04:33 PM                                         
                                                   
                                                                                
                                                   
                                                                                
                                                   




What about snapshots and BLIB (block level incremental backups). I've not
used them (hope to soon), but the theory is intriquing as it has a very
small data footprint and rapid recovery, among other things...

For official email, please respond to cgbrewer AT kpmg DOT com

Chris Brewer
UNIX Systems Consultant
Rocky Mountain Broadband Solution Center
KPMG Consulting, Inc.
6399 S. Fiddler's Green Circle #400
Greenwood Village, CO 80104

720-493-7992



-----Original Message-----
From: Rick Keahey [mailto:rickkeahey AT hotmail DOT com]
Sent: Wednesday, March 06, 2002 2:53 PM
To: joe AT joe DOT net
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Disk to Disk Backups


Ok, so here is my delima.  I have more and more customers coming to me
saying that they have a database that is mission critical and if it goes
down, they need to be able to restore it very quickly, within minutes or few

hours.  The problem is that these databases are expected to grow to several
terabytes in the next year or so.  Backups alone will take forever, but the
restores will be ugly.  We are using DLT's right now and are just starting
to use SDLT's.  I use NetBackup for backups software and do not have the
option to change off of that.  Disk base is really the only choice that I
have to look at from here, although I am not against looking at some other
means that will speed things up.

Thanks,
Rick


>From: Johnny Oestergaard <joe AT joe DOT net>
>To: "Rick Keahey" <rickkeahey AT hotmail DOT com>
>CC: veritas-bu AT mailman.eng.auburn DOT edu
>Subject: Re: [Veritas-bu] Disk to Disk Backups
>Date: Wed, 06 Mar 2002 22:11:09 +0100
>
>We have tried to do diskbackups to see if it's faster, but what we have
>seen is that is't faster to use tapes. Our disksubsystem is a STK
>SVA9500 and the tapedrives are STK 9940 all using FC
>But if you use DLT it could be that it's faster to disk.
>
>I know about sites where they use STK VSM systems and that should be
>fast, but I have never tried that.
>
>/johnny
>
>At 11:34 06-03-2002 -0800, you wrote:
>>I am researching different ways to do disk to disk backups for faster
>>backup and restore times.  Does anyone have any suggested hardware
>>platforms to do this on.  I know that ATL just announced a new
>>solution called the DX-30, but wanted to see if anyone else out there
>>knew of anything else that works as good.  Appreciate your input.
>>
>>Thanks,
>>Rick
>>
>>_________________________________________________________________
>>MSN Photos is the easiest way to share and print your photos:
>>http://photos.msn.com/support/worldwide.aspx
>>
>>_______________________________________________
>>Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>>http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>




_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.

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