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Exchange 2007 Transaction Logs don't appear to be purged with Backup Exec

Posted on 2011-09-26
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Last Modified: 2012-05-12
Hi all, got a possible issue with either Backup Exec 12.5 Rev 2213 or Exchange 2007.
Since 01-04-2011 the logs in E:\Exchange Server\First Storage Group (I assume these are the Exchange Transaction logs?) have built up day by day, almost to the point where the disk was full up. Now I'm no expert with Backup Exec or Exchange, but am I correct in understanding that these logs should be automatically purged / deleted when each full backup runs?

On the settings for our Full Exchange backup I have backup method [Full - Database & Logs (flush committed logs)] - so I guess it should be deleted logs that it thinks are committed? Would there be any way Backup Exec might not see the logs as being committed, or is that something that Exchange needs to do prior to the backup running?

Apologies for the vague question, but I am very concerned that these logs are filling up, and I'm also concerned that I shouldn't manually delete them manually for fear of damaging Exchange, or harming future backups.
Help would be massively appreciated.



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Question by:georgefowler
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jbvernej earned 500 total points
ID: 36599823
Hello,

Yes if Exchange Full backups run AND SUCCEED, the Exchange transaction log are truncated (deleted)
(I assume you have an standalone Exchange server and not a clustered Exchange with CCR: in this case, log truncation can only occur when replication on other node/database is done)

Usually, when logs grow day after day even after backup, you need to ensure that your backups are successfull in your backup software. If not, the software will not truncate log files.
Look at your backup's jobs history to see when and why backups failed.

If your Exchange drive was full, you may need to manually delete some logs after recovering drive space. But caution, they is some procedure to do this without issue:
http://blogs.technet.com/b/exchange/archive/2004/05/12/130556.aspx 
(it is for Exchange 2003 but it is very very similar in Exchange 2007)
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by:jbvernej
ID: 36599831

Look also this symantec's link:

Backup Exec System Recovery (BESR) is NOT truncating Microsoft Exchange transaction logs during a backup.
http://www.symantec.com/business/support/index?page=content&id=TECH57654 
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by:georgefowler
ID: 36600707
Thank you jbvernej, sadly I have just remembered that we have recently started implementing a DR Exchange server on a separate site where logs are replicated up to this server. I'm currently running a test backup-to-disk backup with the Advanced Open File Option disabled, if this doesn't work then I guess it is something to do with the replication?
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