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Exchange 2003 Transaction Log filling up disk

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  • Exchange 2003 Transaction Log filling up disk

    I thought I had enough free room on the disk with the data stores taking 88GB and free room for logs (yes i keep them on the same disk) of 65GB with daily backups. But yesterday evening it was filled with logs. No room left. The questions are.
    1- how much room should I keep for logs (this case was rare but I don't want it again) ?
    2- how could I get warned if the disk goes over 85% usage.
    3- what cause be the cause of 65GB of logs ?? the stores didn't grow more then 500MB overnight.


    Thank you
    Avi

  • #2
    Re: Exchange 2003 Transaction Log filling up disk

    65gb of logs for an 88gb store is a clear sign of something wrong.
    Are the backups flushing the logs correctly?

    The common cause would be an email loop somewhere. That can rapidly generate high numbers of logs.

    Your design is poor. The transaction logs should not be on the same disk as the store, certainly not with a store of that size. The server will be thrashing itself. Ideally the logs should be on another partition from the databases, I usually put them in to their own partition.
    As for size, there is no hard and fast rule, as every site is different. It is often a guess. If you know exactly what you are generating a day then you need enough space for five days of transaction logs (allowing for a four day weekend without backups).

    Simon.
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    Simon Butler
    Exchange MVP

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    • #3
      Re: Exchange 2003 Transaction Log filling up disk

      Transaction logs are generally only removed when you run a full (or incremental) backup. You state daily backups, I assume full ones?

      Do you have anything with spam monitoring capabilities or bulk mailers internally that could be a way of determining cause?

      Disk space monitoring - there are plenty out there but maybe something like this?
      http://www.solarwinds.com/register/i...PUK-Body-EI-DL
      cheers
      Andy

      Please read this before you post:


      Quis custodiet ipsos custodes?

      Comment


      • #4
        Re: Exchange 2003 Transaction Log filling up disk

        Thank you for the quick responses.
        The backups are full and from the dates of the logs they were cleaned properly from the last backup.
        As to the log location together with the data store. All of it is on a NAS (Netapp via iscsi) so I don't see the swapping a problem.
        Were can I see if it's a email loop ? in the system manager I went over the mail sent and received and didn't notice anything special. Are there some log which would show this ?

        Our spam monitoring is from our ISP and there was no noticeable amount of spam more yesterday then any other day.

        Avi

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        • #5
          Re: Exchange 2003 Transaction Log filling up disk

          If they are on a NAS are they different sets of disks? Recommendations are for logs to be on a mirror and Mailbox stores on RAID5/10 etc due to the way they read/write.

          You could copy some of the log files if you still have them and see what is in them.
          You could also look at their dates/times to see if there was a period that a lot were created for example.
          What size do you normally see?
          cheers
          Andy

          Please read this before you post:


          Quis custodiet ipsos custodes?

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