Hello,
Peter is right about requiring additional space for Exchange snapshots on
Netapp, depending on change rate this space could be equal to your
datastore size to ensure consistent snapshots, alternatively, with a few
snapshot cmds, you could automate freeing up space in the volume holding
exchange data based on your criteria, i would recommend you perfect this
routine and implement it, to avoid filing up volumes.
HTH
Peter Viertel <Peter.Viertel AT MACQUARIE DOT COM>
Sent by: EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>
11/18/2008 05:18 PM
Please respond to
EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>; Please respond
to
Peter Viertel <Peter.Viertel AT MACQUARIE DOT COM>
To
NETWORKER AT LISTSERV.TEMPLE DOT EDU
cc
Subject
Re: sizing Exchange 2003 incrementals through networker
A) the query:
mminfo -X -q 'client={clientname},savetime>2 weeks ago'
B)
Using netapps... This is a huge question, but you need to get the
basic understanding of what snapshots are on a netapp - the data doesn't
get copied, just the block allocation tree, so no matter how big your
data is the snapshot only takes a few seconds. The down side is of
course that if you have a very busy workload the amount of space take up
by blocks owned solely by snapshots will be large - that's a site
dependant thing, though. Netapp from experience expect around 20% of
space to be snapshots for an average fileserver load, but with exchange
I don't know what the ballpark figure would be.
Next thing is if you are planning to run copies of your snapshots off to
tape, then you need to allow for keeping some snapshots online for long
enough to do the backup, and your restore solution will not be simple.
There's the solution of using further netapp technology to copy snaps
off to secondary disk space, and this really only works if you forget
about using tape altogether and buy enough disk storage/additional
filers to do it...
Bring your chequebook with you, you may end up with less disk than other
solutions, but netapp don't give their software away for free.
> -----Original Message-----
> From: EMC NetWorker discussion
> [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On Behalf Of Eugene Vilensky
> Sent: Wednesday, 19 November 2008 6:07 AM
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: [Networker] sizing Exchange 2003 incrementals
> through networker
>
> Hello,
>
> I've been trying to provide our Exchange admins with an idea of the
> incremental changes between backups in our exchange
> environment. My most
> often used tool is a "mminfo -X -c [clientname]." This seems
> to be exactly
> what they are looking for. My question is, can I extend this
> summary for
> more than just 7 days inclusive of today, or am I into writing my own
> queryspec territory?
>
> Additionally, has anyone moved from using Networker to tape
> incrementals for
> their Exchange, to NetApp-based snapshots? I am curious, are
> the storage
> requirements for a NetApp snapshot similar, larger, or
> smaller than the
> requirements for doing a similar backup schedule through
> Networker Module
> for Exchange?
>
> Thanks!
>
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