Event ID - 9541

Event Id9541
SourceMSExchangeIS
DescriptionThe Microsoft Exchange Storage Group /DC=COM/DC=MICROSOFT/DC=DNS/DC=DOMAINNAME/CN=CONFIGURATION/CN=SERVICES/CN=MICROSOFT EXCHANGE/CN=ORGNAME/CN=ADMINISTRATIVE GROUPS/CN=FIRST ADMINISTRATIVE GROUP/CN=SERVERS/CN=SERVERNAME/CN=INFORMATIONSTORE/CN=FIRST STORAGE GROUP is off-line.
Event InformationAccording to Microsoft:
RESOLUTION :

To restore an offline backup, you must allow the database to be overwritten during a restore procedure. Follow these steps to enable this option:
1. Start the Exchange System Manager.
2. Expand Servers, expand Server Name, expand Storage Group, and then click the database that was restored.
3. Right-click the database, and then click Properties.
4. Click the Database tab.
5. Click to select the This database can be overwritten by a restore check box.
6. Click OK.
7. To mount the database, right-click the database, and then click Mount Store.
Reference LinksDatabase Does Not Mount After You Restore an Offline Backup

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