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Offline defrag - exchange 2003 standard

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  • Offline defrag - exchange 2003 standard

    Hi
    I have an exchange 2003 server (w/sp2) running on a windows 2003 R2 standard server. (both exch and windows are fully patched). My priv1.edb is 17GB, priv1.stm is 112MB, my pub1.edb is 33GB and my pub1.stm is 2.2GB

    We have the auto online defrag run every night. Last night it showed that after the online defrag was complete on the public folder store, it has 481MB of free space. The mailbox store says it has 1818 megabytes of free space after online defrag is complete. would it be necessary to do an offline defrag? in past experience, i've only had to do 1 offline defrag because of there were massive amounts of mailboxes deleted but that was a couple of yrs ago so it has been some time since i've done this.

    thanks
    Jamie

  • #2
    Re: Offline defrag - exchange 2003 standard

    For the amount of free space being reported, my suggestion would be that no offline defarg is needed. I only perform an offline defrag when the free space is in the range of 10 - 25% of the overall size of the store.

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    • #3
      Re: Offline defrag - exchange 2003 standard

      Ok - If I did do the offline defrag - would it increase the performance of the exch databases?

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      • #4
        Re: Offline defrag - exchange 2003 standard

        Probably only marginally. If you have Exchange performance issues you should download and read this guide:

        http://www.microsoft.com/downloads/d...displaylang=en

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        • #5
          Re: Offline defrag - exchange 2003 standard

          Offline defrag on a store of that size is a waste of time.
          Any performance increase will be negligible at most.

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
          More Exchange Content: http://exchange.sembee.info/
          Exchange Resources List: http://exbpa.com/
          In the UK? Hire me: http://www.sembee.co.uk/

          Sembee is a registered trademark, used here with permission.

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          • #6
            Re: Offline defrag - exchange 2003 standard

            Well a while back ago (Before the 75 GB limit) I once needed to do an offline defrag.
            The filesize on disk was above the 16GB (almost 17GB) and the eventlog filled up with warnings about the filesize.
            Also we got a lot of problems with performance.

            After an offline defrag the filesize was reduced to about 8 GB and all problems where gone.
            I know that with the current 75 GB wouldn't be a problem anymore.
            Marcel
            Technical Consultant
            Netherlands
            http://www.phetios.com
            http://blog.nessus.nl

            MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
            "No matter how secure, there is always the human factor."

            "Enjoy life today, tomorrow may never come."
            "If you're going through hell, keep going. ~Winston Churchill"

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            • #7
              Re: Offline defrag - exchange 2003 standard

              Ah, the good old days.

              My first job in IT about 3 years ago, every second call was "My Exchange just went down, what's happened?" and it was almost always the 16gb limit being hit. We were doing offline defrags for at least one customer every week it seemed.

              Probably not going to make much difference right now, but if you've got the time and the disk space on the server to do it there's no harm in it. Having to do it over the network because of lack of free space on the server was a pain. Invariably the customer we were working with would turn off the target system and we'd have to schedule the whole thing over again.
              BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
              sigpic
              Cruachan's Blog

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              • #8
                Re: Offline defrag - exchange 2003 standard

                What you need to remember is that an offline defrag basically produces a new database. Therefore if the database has issues with its structure, those could be resolved by an offline defrag as well.

                With Exchange 2007, the recommend is never to do an offline defrag, because it isn't required. Move the data to another store and then recreate the database and move the data back.

                Simon.
                --
                Simon Butler
                Exchange MVP

                Blog: http://blog.sembee.co.uk/
                More Exchange Content: http://exchange.sembee.info/
                Exchange Resources List: http://exbpa.com/
                In the UK? Hire me: http://www.sembee.co.uk/

                Sembee is a registered trademark, used here with permission.

                Comment


                • #9
                  Re: Offline defrag - exchange 2003 standard

                  Thanks for the all the great feedback. I have plenty of disk space on our server and decided to give it a shot this weekend. After it completed, the public folder store went from 33GB to 32 and our mailbox store went from 17GB to 15GB.
                  Probably what I could have done was taken care of this when the company migrated from Exch 2000 to 2003. Once this was completed we switched hardware again so I had to an exch 2k3 to an exch2k3 migration again. So maybe after all the moving around and even deleting some emails in a few public folders (about 1.5GB worth) this might have reclaimed some of the white space. Believe me, I dont plan on doing another offline defrag unless we start to have a problem ... Knock on wood we've never experienced any major problem with our information store.

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