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Transaction logs not flushing for one storage group

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Transaction logs not flushing for one storage group - 11.Sep.2008 9:19:08 AM   
doctortt

 

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I just took over the support of this exchange box. This box has two storage groups.  The transaction logs for one of the storage groups do not get flushed/purged after a full backup. However, the logs of the other storage group get flushed/purged without any problems. This company uses Arcserve. The admin checked the settings of the backup job, and everything was fine. There was only a single exchange backup job, and it contained both storage groups. I'm thinking the problem is not caused by the backup program. What else can it be? I guess I will have to follow the MS article to manually remove the logs. Moving forward, I really want to get this fixed for the client. I can't be manually removing the logs all the time, right? Thanks
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RE: Transaction logs not flushing for one storage group - 11.Sep.2008 9:39:50 AM   
uemurad

 

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You've got some other issues going on with that mailbox store.  That isn't something to take lightly.  Something is causing the database not to be marking the log files as committed, so Arcserve isn't seeing any logs it can purge.  Manually deleting the log files at this point means you are running the risk of not being able to replay them later.

The simplest answer is to bite the bullet and call Microsoft PSS.  You can learn some things with ESEUTIL, but if you don't know exactly what you are doing, it's best not to experiment.  You're talking about your live data.

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to doctortt)
Post #: 2
RE: Transaction logs not flushing for one storage group - 11.Sep.2008 12:01:18 PM   
ismail.mohammed

 

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Joined: 9.May2007
From: India
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hi mate,

as per uemurad said it is not best practice to play around unless and until you know the purpose what you are doing.

One time one of my client faced this issue - Root cause was log file corruption (i guess)
What i did there.
> Just i dismounted all the store of that particular storage group
> moved all the content except .stm and .edb
> then i checked the database (just to be on a safe side)
> Then mounted the database
> Finally i took online backup which has been resolved the issue.


May be you can try this before you call up the PSS

(in reply to uemurad)
Post #: 3
RE: Transaction logs not flushing for one storage group - 12.Sep.2008 1:52:49 PM   
doctortt

 

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This storage group in question has a temporary mailbox store that's dismounted for awhile. Someone has told me that this causes the backup not to flush the logs afterward. I removed this dismounted temporary mailbox store and will see what happens to the backup tonight.

(in reply to ismail.mohammed)
Post #: 4
RE: Transaction logs not flushing for one storage group - 12.Sep.2008 3:18:49 PM   
ismail.mohammed

 

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Joined: 9.May2007
From: India
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Post the update

(in reply to doctortt)
Post #: 5
RE: Transaction logs not flushing for one storage group - 12.Sep.2008 5:53:46 PM   
uemurad

 

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From: California, USA
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quote:

This storage group in question has a temporary mailbox store that's dismounted for awhile.
That's the issue.  Remember that transactional logs are for the entire Storage Group.  If you have one store in that group that's dismounted when the backup runs, or you don't backup all the stores in the group, then the transactional logs cannot fully commit and therefore cannot be marked to be purged.  You should also be seeing events in your Application Log about the purge or failure to purge.

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to doctortt)
Post #: 6
RE: Transaction logs not flushing for one storage group - 22.Sep.2008 10:42:36 AM   
doctortt

 

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Joined: 26.Jan.2006
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Things look good now. I deleted the unmounted store, which this company no longer used. Ran a full backup, and the logs were flushed.

(in reply to uemurad)
Post #: 7

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