Today I've troubleshoot some issues with backup of an Exchange 2010 DAG installation. Some databases were partially backed up according to the backup software (Symantec Netbackup).
I came over the information event:
Source: Storage Group Consistency Check
Event ID: 200
Instance X: Database headers have been successfully validated. All Databases are in a dirty shutdown state. Tobring these databases to a clean shutdown state, log generation xxxxx(0x0xxxx) to xxxxxx (0x0xxxxx) will be required.
As it says this is only for information, and there is no need to be worried and is as expected when the database is online.
When the database is online it has logs in memory or open logs etc. that are not committed yet.
So, don’t worry, this is expected, and this check is done on online backup.
On the other hand, if your database is offline and you get Dirty Shutdown when running eseutil /mh (DBpath+filename) then you might have a bigger issue, and have to do a repair / restore and log replay job.