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тАО02-05-2009 04:04 PM
тАО02-05-2009 04:04 PM
Anyone use SAN based demand-allocated snapshots of Exchange 2007 SP1 Database LUNs?
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тАО02-07-2009 06:43 AM
тАО02-07-2009 06:43 AM
Re: Anyone use SAN based demand-allocated snapshots of Exchange 2007 SP1 Database LUNs?
I'm not doing copy-on-write snapshots, however, I can see where the data is going to grow exponentially until you have no data storage left. I realize the snapshots will not be larger than the source as they are delta files, however, you are going to constantly be creating them.
If I understand this correctly, each time a change is made to the Exchange LUN, you are creating a snapshot. I would assume every transaction (e.g. e-mail, setting change) is going to fire off a snapshot.
What are you trying to accomplish (e.g. disaster recovery, high availability)? Is the Exchange server with the MB role doing any LCR or CCR?
More questions than answers!!
-Gfuss
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тАО02-07-2009 07:06 AM
тАО02-07-2009 07:06 AM
Re: Anyone use SAN based demand-allocated snapshots of Exchange 2007 SP1 Database LUNs?
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тАО02-07-2009 07:27 AM
тАО02-07-2009 07:27 AM
Re: Anyone use SAN based demand-allocated snapshots of Exchange 2007 SP1 Database LUNs?
Each time a new mailbox database is created, a maintenance time is automatically selected.
This is found on the Properties of the Mailbox Database and I believe it is usually 1-3am by default.
I'm wondering if you adjust the snapshot to be after the maintenance, if that will decrease the size of the delta.
Let me know what you find.
-Gfuss
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тАО02-09-2009 06:39 AM
тАО02-09-2009 06:39 AM
Re: Anyone use SAN based demand-allocated snapshots of Exchange 2007 SP1 Database LUNs?
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тАО02-09-2009 06:41 AM
тАО02-09-2009 06:41 AM
Re: Anyone use SAN based demand-allocated snapshots of Exchange 2007 SP1 Database LUNs?
I didn't try the snapshots while we were only at SP1 so I don't know if same behavior.
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тАО02-09-2009 08:01 AM
тАО02-09-2009 08:01 AM
Re: Anyone use SAN based demand-allocated snapshots of Exchange 2007 SP1 Database LUNs?
This may/not help, but here's a page detailing what causes the DB to change/grow rapidly: http://tinyurl.com/bdgv3a
That wouldn't explain why the delta file itself is growing to the same size as the original, however, it may offer some insight.
-Gfuss