How long it takes to reach the Transaction Log Numbering Sequence limit in exchange 2003/2007?

Posted on 2009-12-23
Last Modified: 2012-06-27
Hi Experts,

A few weeks ago, we got the aler below from the MOM server, to restart transaction log secuence on an Exchange server.

The transaction log sequence for a storage group is about to run out of available file names.
Description:  Information Store (5368) xxxxxxxxxx: Log sequence numbers for this instance have almost been completely consumed. The current log generation is 918000 (0x000E01F0) which is approaching the maximum log generation of 1048559 (0x000FFFEF), there are 130559 (0x0001FDFF) log generations left to be used. To begin renumbering from generation 1, the instance must be shutdown cleanly and all log files must be deleted. Backups will be invalidated.

I would like to know, how long it takes to reach the Transaction Log Numbering Sequence limit in exchange 2003/2007?

Is there a way to calculate this?

Thanks in advance
Question by:Jerry Seinfield
    LVL 14

    Expert Comment

    no, you can't REALLY calculate it because it all depends on how much traffic etc is going hrough your server.

    What you can do, is take the number of available transaction logs left,a nd divide that by how many you generate in a day to give you a rough guide.

    From teh time of that error you have about 130000 left. So if in 24 hours you're current log file nubmer goes up say 2000, it means you have somewhere around 65 days left before you run out of numbers. You get plently of warning so you can schedule an outage for it.   explains more and has a link to how to reset the counter.

    Author Comment

    by:Jerry Seinfield
    If I understood correctly, from the message above, I have 130559 (0x0001FDFF) log generations left to be used, and my server generates 2400 transaction log files, so

    how many days to reach the limit are?

    LVL 14

    Accepted Solution

    well if you average 2400 log files a day, then you have about 55 days from the time that message came up.

    However, you can't "guess" on the number of days like that, a lot fo spam comes in or jsut a lot of mail traffic, and suddenly you do 5000 logs instead.

    Best to clean it up ASAP

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