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Moving mailboxes from EX03 to EX10

Posted on 2011-03-15
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Last Modified: 2012-05-11
Hello,
Is is a bad idea to move Mailboxes from an Exchange 2003 running on a VM, to EX10 running on a physical machine?
I know that Microsoft will not support this under a Support Ticket.

I was able to move 75% of my Mailboxes, but the rest are stuck in a "Moving" state.

Thanks
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Question by:cliffordgormley
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Expert Comment

by:Glen Knight
ID: 35140903
No reason why it shouldnt work.

It wont move them all at the same time, by default it will do 4 at a time.

Double click one of the ones that say moving and see what percentage it says has moved.

Have you got enough disk space on both servers for the transaction logs that will be created during the move process?? I normally take a backup then enable circular logging whilst migrating mailboxes then take a full backup and disable circular logging when the moves are finished.

Circular logging Exchange 2010: http://technet.microsoft.com/en-us/library/dd297937.aspx

Circular logging Exchange 2003: http://support.microsoft.com/kb/314605
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Author Comment

by:cliffordgormley
ID: 35140998
Demazter,
When you say you make a backup, do you mean that you just backup the Exchange Database?
Do you have to disable Exchange Services prior to doing the backup?
What app. do you recommend to do the backup?
Thanks
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Expert Comment

by:Glen Knight
ID: 35141026
Just the exchange databases are fine, its just to make sure you have a full backup.  Just use Windows Backup.

No services need to be stopped if you use an exchange aware backup (like windows backup).  When you enable/disable circular logging you will need to dismount and then mount the store again which will take the exchange database down briefly.
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Author Comment

by:cliffordgormley
ID: 35141029
I had about 5 Mailboxes that were in a state of "Moving"
They ALL said 20% moved.
The "duration" only  said 19 minutes for them, even though it has been hours.
I keep getting Event ID 7031 Error Messages in the System log about every hour.
I have restarted MRS, but the 7031 error keeps reoccuring.
I have the latest SPs on Server 2008 and EX2010.
I also have installed Exchange Rollup 2.

To no avail.
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Expert Comment

by:Glen Knight
ID: 35141050
Whats the content of the 7031 error?

Its not unusual for it to take hours for the moce to be queued and then only start moving once a thread becomes available.  By default only 4 mailboxes will be moved at a time.
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Author Comment

by:cliffordgormley
ID: 35141550
Here you go demazter:

The Microsoft Exchange Mailbox Replication service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 5000 milliseconds: Restart the service.


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Expert Comment

by:Glen Knight
ID: 35141615
Hmm, that needs to be running for the mailbox moves to work.

It could be down to disk space though as i said earlier, did you check the disk space?
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Author Comment

by:cliffordgormley
ID: 35142006
EX03 free disk space:  16.7GB
5 minutes into the move: 16.0GB free
10 minutes into the move.....15.2GB free.  Mailbox % moved: 0%

EX10 free disk space: 4545GB
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Author Comment

by:cliffordgormley
ID: 35142028
nevermind!
I am running a backup to the same drive as the target.
DOH!
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Expert Comment

by:Glen Knight
ID: 35142030
Is it a large mailbox? Didyou enable circular logging?
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Expert Comment

by:Glen Knight
ID: 35142033
Ahh!! That might do it ;)
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Author Comment

by:cliffordgormley
ID: 35142065
768M mailbox
Circular logging is enabled.

So please confirm that i am understanding Circular Logging.
Enabling Circular Logging allows you to use less disk space on the har drive because once the data is committed to the database, the log info related to the data that is committed to the database, can be overwritten.

If that is true, I do not see why Circular Logging should ever be disabled.
Why would one want to keep multiple copies of database backups?
A backup of the latest database would seem fine with me in 99% of the cases.

Thanks
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Accepted Solution

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Glen Knight earned 500 total points
ID: 35142110
The circular logging is normally disabled for 2 reasons.  Performance is degraded with it enabled.  Secondly, you would normally store the log files on a different disk.  And seeing as most people used to only do a full Backup uncertain a week the logs can be used to replay what has happened since the last full Backup.

These days though, more people perform full backups very day but even then, 1 days worth of email could be crucial for some companies.  If you have circular logging enabled and the hard drive your store in fails that's it, all you have is your last full Backup.  If the logs are stored on another drive and circular logging is not enabled then you can recover right up to the last email received by the exchange system.
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Author Comment

by:cliffordgormley
ID: 35143738
My problem was caused by the issue documented in KB979862
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