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The information in this article applies to:
Microsoft Exchange Server, version 5.5
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SYMPTOMS
The Exchange Server directory service and information store service may shut down if the drive space for the associated transaction logs or the drive space for the database drive falls to 10 megabytes (MB) or less.
CAUSE
The Exchange Server directory service and the information store log the changes that are made to the databases in transaction logs for recovery purposes.
If you have circular logging disabled, logs are left on the drive until a full or incremental online backup (that uses Exchange Server-aware backup software) is performed.
If your database is not backed up and excessive changes are made to your server or data is added to your databases, the drive that holds the transaction logs may fill up, which causes the Exchange Server services to stop.
WORKAROUND
To work around this issue, determine which log files you can safely move to free up disk space, and move them.
The Edb.chk is the checkpoint file for the logs, which keeps track of the last committed log to the Dir.edb, Pub.edb, or Priv.edb databases. This file is usually located on the same drive as the x:\Exchsrvr\Bin folder under the x:\Exchsrvr\Dsadata folder (for the directory service), and x:\Exchsrvr\Mdbdata (for the information store).
bron:
http://support.microsoft.com/support/kb/articles/Q259/7/51.ASP
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