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Event ID: 9559 Source: MSExchangeIS

Source
Level
Description
The log disk is full for storage group "First Storage Group". Attempting to unmount all databases in this storage group.
Comments
 
As per Microsoft: "When a database runs out of disk space it will dismount all the databases. When a database runs out of disk space, it must be dismounted". See MSEX2K3DB for additional information about this event.
This issue can occur if there is not a sufficient amount of free disk space on the drive that contains the databases that you are trying to mount. See ME294318 for more details.

This problem can also be caused by low disk space on the Exchange Information Store Drive. See ME555425 for more details on this issue.

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