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тАО06-01-2011 05:15 AM
тАО06-01-2011 05:15 AM
Snapshot of Exchange 2010 purges logfiles
I have my Exchange 2010 databases on volumes on a P4000 running 9.0.
The Exchange server has the HP VSS tools installed.
When I create a managed snapshot from the CMC it correctly detects that there are 2 volumes, however it also purges the Exchange transaction logs which I did NOT expect to happen - I only expected that the application aware snapshot would make a consistent snapshot.
Is this normal behaviour please?
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тАО06-01-2011 01:40 PM
тАО06-01-2011 01:40 PM
Re: Snapshot of Exchange 2010 purges logfiles
AFAIK this is a "feature" of the VSS support of Exchange 2010. So this is by design.
Regards,
Patrick
Patrick
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тАО06-02-2011 12:56 AM
тАО06-02-2011 12:56 AM
Re: Snapshot of Exchange 2010 purges logfiles
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тАО06-02-2011 07:27 AM
тАО06-02-2011 07:27 AM
Re: Snapshot of Exchange 2010 purges logfiles
In the standard transaction logging that is used by Exchange 2010, each database transaction is written to a log file and then to the database. When a log file reaches one megabyte (MB) in size, it is renamed and a new log file is created. Over time, this results in a set of log files. If Exchange stops unexpectedly, you can recover the transactions by replaying the data from these log files into the database. Circular logging overwrites and reuses the first log file after the data it contains has been written to the database.
In Exchange 2010, circular logging is disabled by default. By enabling it, you reduce drive storage space requirements. However, without a complete set of transaction log files, you cannot recover any data more recent than the last full backup. Therefore, in a normal production environment, circular logging is not recommended.
Hope this helps.
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тАО06-02-2011 07:37 AM
тАО06-02-2011 07:37 AM
Re: Snapshot of Exchange 2010 purges logfiles
Thanks for the info, but it's not really the same thing that I'm asking.
I know how the Exchange logs work and how circular logging works and the advantages/disadvantages.
What I didn't expect was that creating an application aware snapshot in the P4000 would purge the transaction logs.
This is the first SAN we've had with a VSS component so it may be that this is normal on all such SANs.
Paul
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тАО06-02-2011 08:08 AM
тАО06-02-2011 08:08 AM
Re: Snapshot of Exchange 2010 purges logfiles
There are two ways to manage this growth with the recommended method being a regular full backup of the Information Store.
Upon successful backup, the transactions are committed to the database and then purged.
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тАО06-02-2011 09:15 AM
тАО06-02-2011 09:15 AM
Re: Snapshot of Exchange 2010 purges logfiles
Where I'm struggling seeing the benefit of using Application Managed snapshots is because if that purges the transaction logs, it means I can't do a consistent incremental backup using our backup software because there will be 2 different products (the software & the P4000) telling Exchange to purge the transaction logs.
So I guess I'm wondering what other folks who have Exchange 2010 and a P4000 do?
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тАО06-03-2011 07:57 AM
тАО06-03-2011 07:57 AM
Re: Snapshot of Exchange 2010 purges logfiles
I do agree that an application aware backup that does not clear the logs could be useful, but question weather this is something HP could implement or if it is a VSS specific setting, and thus on Microsoft to address.