Simultaneous backup and duplication unfortunately doesn't seem to work
all the time in NBU even when you're doing both to tape.   

We found that if you tell it restart on failure it doesn't seem to
restart at all.  If you tell it to continue it does continue the one
copy that didn't fail but if you have a failure on one of your copies
you end up without a duplicate (or primary) so would have to manually
create the other. 

We were hoping 6.5.2 was going to fix that and other things but based on
all the buzz about 6.5.2 and 6.5.2a we'll probably hold off until 6.5.3.


-----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 Jim
Horalek
Sent: Wednesday, July 30, 2008 3:41 PM
To: 'veritas-BU'
Subject: Re: [Veritas-bu] Exagrid

The line from Exagrid is since the last backup is not deduped(post
processing previous backups) restores are faster (there is no undup
needed
for restoring from the last backup.)

Never evaluated one(Exagrid) so I have know opinon. 

How do any of these devices compare in a large vaulting environment
where
you may have simultanious backups and duplications.

Jim

-----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 Jeff
Lightner
Sent: Wednesday, July 30, 2008 10:15 AM
To: Andrew Stueve; veritas-BU
Subject: Re: [Veritas-bu] Exagrid


DD doesn't pay me either but IMHO but the idea of inline dedupe made
more
sense to us simply due to the fact we wouldn't have to find rack/floor
space
for significantly increased storage required by post dedupe.

FYI:  EMC is pushing dedupe solutions as well.   There is a also a
company called Sepaton doing it.

You should probably get information from as many of these vendors as
possible then decide which makes sense to pursue for testing.

-----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 Andrew
Stueve
Sent: Wednesday, July 30, 2008 12:52 PM
To: veritas-BU
Subject: Re: [Veritas-bu] Exagrid

I think that "post process vs. inline" is an important issue.

We evaluated both Netapp and Data Domain, before choosing the Data 
Domain solution.   One of reasons was that processing.

Post processing, means if you are writing 4 Tb of data on a weekend 
full, you have to have 4 Tb of free disk space to write it all, and then

it will compress down.

In-line, means that as you write that 4 Tb of data, you only have to 
have the space for the de-duped/compressed image.

I won't shill for Data Domain, since they don't pay me, but...

-Andrew

Fergus Donohue wrote:
> Hi Justin,
> 
> Thanks for the feedback. They sell a NAS based de-dupe device very
> similar in concept to Data Domain, but it does post-process rather
than 
> in-line de-dupe. Price-wise they appear very competitive and I was
> wondering if anyone had any real-world experience with them.
> 
> Thanks,
> 
> Fergus.
> 
> Justin Piszcz wrote:
>> Never heard of or used it myself Fergus.
>>
>> Justin.
>>
>> On Wed, 30 Jul 2008, Fergus Donohue wrote:
>>
>>   
>>> Should I take the resounding silence as a "no" then? ;)
>>>
>>> Thanks,
>>>
>>> Fergus.
>>>
>>> Fergus Donohue wrote:
>>>     
>>>> Hi all,
>>>>
>>>> The question has been asked here before, but things may have moved
on
>>>> since. Has anyone deployed an Exagrid solution in production and if
so,
>>>> how has it been?
>>>>
>>>> Thanks,
>>>>
>>>> Fergus.
>>>> _______________________________________________
>>>> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu 
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