I have a 3 node Exchange DAG (2 servers in production, 1 in DR). Each mailbox database has 3 copies (2 in production, 1 in DR). Backup Exec takes a backup from the passive copy in production however this has failed due to dirty shutdown. We cannot take a backup from DR at the moment, so my question is can I just reseed the passive copy in production or should I attempt to repair the database?

I have a 3 node Exchange DAG (2 servers in production, 1 in DR). Each mailbox database has 3 copies (2 in production, 1 in DR). Backup Exec takes a backup from the passive copy in production however this has failed due to dirty shutdown. We cannot take a backup from DR at the moment, so my question is can I just reseed the passive copy in production or should I attempt to repair the database?

Reseed. Never repair if possible.

Not sure what you mean by "however this has failed due to dirty shutdown" however.

Assuming you have a viable mounted copy, reseed any passive copies if they are corrupt.

Thank you for your reply. Yes, we have a mounted healthy copy that I will reseed from out of hours.

As for your query, I have a called logged in ServiceNow by the backup team stating that the backup of the mailbox databases have failed, the error in Backup Exec specifically stated that the cause was due to dirty shutdown state.

Thank you for your reply. Yes, we have a mounted healthy copy that I will reseed from out of hours.

As for your query, I have a called logged in ServiceNow by the backup team stating that the backup of the mailbox databases have failed, the error in Backup Exec specifically stated that the cause was due to dirty shutdown state.

Ok, No need to reseed off hours unless there is some other technical issue I am not aware of.

A mounted database is always in a dirty shutdown state really, but if you are getting an error during a VSS backup, it may be something else causing it. That being said, there is really no harm in reseeding a passive copy.