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From: raz4183 on 1 Mar 2010 12:26
We are running MS Exchange 2003 SP2 on Windows 2003 Enterprise edition.
I'm working on a project to move all of our mailboxes from their current
drive to a new drive on the same server. I have two users with large
mailboxes - one is over 11GBs in size and the other is over 5GBs in size. The
Transaction Log files are located on a separate drive with a total size of
9.99GBs. During an average day the Trans log files may go as low as 9.00GB of
available free space. During the process of moving mailboxes the size of the
Trans Log files shrinks quite a bit depending on how many mailboxes I move
until the next backup which resets the size to 9.99.
What I need to know is if the total size of the Trans log file drive is too
small to handle moving the two mailboxes I mentioned above - will I run out
of disk space before the move is completed? If I move a 5GB mailboxe will it
take take 5GBs off of the trans log files? I can increase the size of the
trans log files but I would like to try to avoid this if I could.
From: Leonid S. Knyshov // SBS Expert on 1 Mar 2010 12:57
On 3/1/2010 9:26 AM, raz4183 wrote:
> We are running MS Exchange 2003 SP2 on Windows 2003 Enterprise edition.
> I'm working on a project to move all of our mailboxes from their current
> drive to a new drive on the same server. I have two users with large
> mailboxes - one is over 11GBs in size and the other is over 5GBs in size. The
> Transaction Log files are located on a separate drive with a total size of
> 9.99GBs. During an average day the Trans log files may go as low as 9.00GB of
> available free space. During the process of moving mailboxes the size of the
> Trans Log files shrinks quite a bit depending on how many mailboxes I move
> until the next backup which resets the size to 9.99.
> What I need to know is if the total size of the Trans log file drive is too
> small to handle moving the two mailboxes I mentioned above - will I run out
> of disk space before the move is completed? If I move a 5GB mailboxe will it
> take take 5GBs off of the trans log files? I can increase the size of the
> trans log files but I would like to try to avoid this if I could.

You may want to enable circular log files while you move the mailboxes.
Obviously, execute a full backup first, and re-enable normal logging
immediately after the move. This is the only scenario where enabling
circular logging makes sense. I definitely never recommend it otherwise. :)

I do the same thing as you when it comes to storing logs separately. You
can run a backup, temporarily move them to a larger partition, and then
move them back to where they are now. The risk is minimal then.
--
Leonid S. Knyshov
Crashproof Solutions
510-282-1008
Twitter: @wiseleo
http://crashproofsolutions.com
Microsoft Small Business Specialist
Please vote "helpful" if I helped you :)
From: raz4183 on 2 Mar 2010 10:26
Since I have all 3 mailbox stores pointing to the same transaction log file,
do I enable circular logging on all 3 mailbox stores or just the source store?

"Leonid S. Knyshov // SBS Expert" wrote:

> On 3/1/2010 9:26 AM, raz4183 wrote:
> > We are running MS Exchange 2003 SP2 on Windows 2003 Enterprise edition.
> > I'm working on a project to move all of our mailboxes from their current
> > drive to a new drive on the same server. I have two users with large
> > mailboxes - one is over 11GBs in size and the other is over 5GBs in size. The
> > Transaction Log files are located on a separate drive with a total size of
> > 9.99GBs. During an average day the Trans log files may go as low as 9.00GB of
> > available free space. During the process of moving mailboxes the size of the
> > Trans Log files shrinks quite a bit depending on how many mailboxes I move
> > until the next backup which resets the size to 9.99.
> > What I need to know is if the total size of the Trans log file drive is too
> > small to handle moving the two mailboxes I mentioned above - will I run out
> > of disk space before the move is completed? If I move a 5GB mailboxe will it
> > take take 5GBs off of the trans log files? I can increase the size of the
> > trans log files but I would like to try to avoid this if I could.
>
> You may want to enable circular log files while you move the mailboxes.
> Obviously, execute a full backup first, and re-enable normal logging
> immediately after the move. This is the only scenario where enabling
> circular logging makes sense. I definitely never recommend it otherwise. :)
>
> I do the same thing as you when it comes to storing logs separately. You
> can run a backup, temporarily move them to a larger partition, and then
> move them back to where they are now. The risk is minimal then.
> --
> Leonid S. Knyshov
> Crashproof Solutions
> 510-282-1008
> Twitter: @wiseleo
> http://crashproofsolutions.com
> Microsoft Small Business Specialist
> Please vote "helpful" if I helped you :)
> .
>
From: Leonid S. Knyshov // SBS Expert on 2 Mar 2010 10:52
On 3/2/2010 7:26 AM, raz4183 wrote:
> Since I have all 3 mailbox stores pointing to the same transaction log file,
> do I enable circular logging on all 3 mailbox stores or just the source store?
>
http://support.microsoft.com/kb/821829 - this is KB article on this

"For every gigabyte of data that you move, an additional gigabyte of
transaction logs is generated at the source and target server. Verify
that you have sufficient free space on your transaction log drives. If
you do not have sufficient free space on your transaction log drive for
transaction log file generation, you could temporarily turn on circular
logging on the General tab of the storage group's properties page."

I tested working with an Exchange server with 3 mailbox stores at
http://technet.microsoft.com/en-us/virtuallabs/bb499043.aspx

You can control transaction logs only at storage group level and do not
have the option to enable or disable transaction logs at mailbox store
level. Thus, the answer to your question is "yes" as you do not have
another option.

You could also simply move transaction logs to another location, but
that would momentarily make Exchange unavailable. I say momentarily
because you would normally do that immediately after completing a full
backup.
--
Leonid S. Knyshov
Crashproof Solutions
510-282-1008
Twitter: @wiseleo
http://crashproofsolutions.com
Microsoft Small Business Specialist
Please vote "helpful" if I helped you :)
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