| Event Id | 9558 |
| Source | MSExchangeIS |
| Description | An error occurred while writing to the database log file of storage group "<name>". Attempting to unmount all databases in this storage group. |
| Event Information | According to Microsoft: EXPLANATION: This event message indicates that a disk error has occurred when writing a storage group log file. A disk-full condition on the disk containing the log files probably caused this error. USER ACTION: Check the disk for problems. |
| Reference Links | Exchange (MSExchangeIS) |
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