Exchange LOG file problem - no space

Hi Experts,
I have a big problem with my exchange cluster, 2 nodes.
I have no space available anymore, just some hundred MB.

What can I do in the meantime, so that Exchange is running ?
I try to make a full backup but this fails, because of backup agent -> I try to fix it.

But this is critical, the Exchange DB needs to be online.
In the meantime I extend the raid with one disk but this still takes some hours.

What can I do, with no big risk ?
What exactly is circular logging ?
Or can I ship the logs to some other place ? I have 60GB on C drive?
Eprs_AdminSystem ArchitectAsked:
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R--RCommented:
You can move the logs to other drive or delete them, however you have to first dismount the database and run eseutil /mh to check if the database is in clean state. Once you verify the database is in clean state you can move the logs and mount the database again.

The other way is to enable the circular logging and dismount and remount the database. By doing this the logs will be cleared. The only issue by enabling circular logging, you reduce drive storage space requirements. However, without a complete set of transaction log files, you cannot recover any data more recent than the last full backup. Therefore, in a normal production environment, circular logging is not recommended.
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Eprs_AdminSystem ArchitectAuthor Commented:
ok I see.
But to dismount the database, I have to wait til midnight.

What can I do in the meantime, when the DB is online ?
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Eprs_AdminSystem ArchitectAuthor Commented:
Can I enable circular logging with out dismount my DB ?
What about the logs before enable it ?
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Eprs_AdminSystem ArchitectAuthor Commented:
to flush the logs into the database, which files I have to backup ?
Just the information Store ?
Or the edb files + logs itself ?
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Suliman Abu KharroubIT Consultant Commented:
to flush the logs into the database, which files I have to backup ?
Just the information Store ?
Or the edb files + logs itself ?

The Database, and this should be done by an exchange-aware backup software in order to truncate the logs files properly.
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Suliman Abu KharroubIT Consultant Commented:
Yes dismount and remount is required when enabling cerculire logging.
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Eprs_AdminSystem ArchitectAuthor Commented:
with eseutil /mh I found out, that I have checksumm errors.
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Satya PathakLead Technical ConsultantCommented:
I order to resolve checksum error you will have to ran the below command


eseutil /k "mailbox database.edb"

for more info :

https://www.simple-talk.com/sysadmin/exchange/exchange-server-log-file-replay/
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