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Approx Time for Offline Defrag

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  • Approx Time for Offline Defrag

    I need to do an offline defrag on my Exchange 2003 system and I need to find out approximately how long the process would take. I've got 2 storage groups, one with 4 mail stores and the other with 1. The first is taking up about 400gb total. I have cleaned out about half that amount in old mailboxes and a mailbox that was being journaled to. The second storage group contains about 6gb.

    Any way to figure out how long this might take? I'm trying to make sure I allocate enough time for this to complete.

  • #2
    Re: Approx Time for Offline Defrag

    The general understanding is that the defrag process runs at a rate of about 4-5GB per hour. The last one I ran took 40 hours to defrag a 200GB database.

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    • #3
      Re: Approx Time for Offline Defrag

      Why you want to go through the pain of a offline defrag?

      Since you already are using the enterprise version just create a new mailbox store and move the mailboxes over.

      If you want to keep the old mailboxstores as well you can then put them offlne, delete the physical files, mount the database again and voila just a new fresh database.

      This procedure only means a little downtme for the users while their mailboxes are moved.

      PS: Single instance storage is overrated and already gone with Exchange 2010.

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      • #4
        Re: Approx Time for Offline Defrag

        If you can get 4-5gb per hour then you are doing well. The worst case scenario is 1gb per hour.

        With a store of that size I wouldn't even be considering an offline defrag. As already stated, move the data around in to new databases. Zero downtime, zero risk.

        Simon.
        --
        Simon Butler
        Exchange MVP

        Blog: http://blog.sembee.co.uk/
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        Sembee is a registered trademark, used here with permission.

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        • #5
          Re: Approx Time for Offline Defrag

          Thanks for the replies. I'll go ahead and move the mailboxes to another store and just delete that store. Sounds easy enough...

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          • #6
            Re: Approx Time for Offline Defrag

            Technically speaking, there is downtime. The users can't access their mailboxes while they're being moved. You can break the move up into chunks of users, but those users will have no access to their mailboxes while the move is in process.

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            • #7
              Re: Approx Time for Offline Defrag

              Originally posted by joeqwerty View Post
              Technically speaking, there is downtime. The users can't access their mailboxes while they're being moved. You can break the move up into chunks of users, but those users will have no access to their mailboxes while the move is in process.
              Right, I understand that. I'll be doing this during our normally schedule maintenance period so we'll be down anyway.

              I haven't tried, but can I move multiple mailboxes at the same time? Or is it best to do them individually? I have about 20 to move.

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              • #8
                Re: Approx Time for Offline Defrag

                If I remember correctly, the move mailbox wizard is multithreaded. It will move 4 mailboxes at a time.

                You can also launch multiple instances of the mailbox move wizard as well.

                When you run it, select all of the mailboxes to be moved and it will move 4 at a time, then the next 4, and so on, and so on.

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