Re: [Veritas-bu] Exagrid
2008-07-30 13:51:34
My thoughts on the inline vs post process debate can be found in this blog
entry:
http://www.backupcentral.com/content/view/134/47/
What you say is mostly true. BUT if the post processing vendor has a greater
dedupe ratio (possibly because they can spend more TIME deduping), then it
should help mitigate this difference. Without going into details of each
vendor trust me when I say they ALL have situations where they're using more
space than the competitor.
Another reason it's not entirely true is that some post processing vendors are
deduping during ingest just like inline vendors. They're just doing it
asynchronously. If they're deduping at a rate close to the ingest rate, then
you don't need enough disk for a whole night's backups. You only need an hour
or so.
Finally, the difference in space created by having an additional night's
backups stored in its entirety (if that's how it does it) decreases
significantly as your retention period increases.
Curtis Preston | VP Data Protection
GlassHouse Technologies, Inc.
T: +1 760 710 2004 | C: +1 760 419 5838 | F: F: +1 760 710 2009
cpreston AT glasshouse DOT com | www.glasshouse.com
Infrastructure :: Optimized
-----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 9:52 AM
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.
>>>> _______________________________________________
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>>>>
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