How to Reseed an Exchange 2019 DAG Database Copy

If for some reason a passive copy of a mailbox database in a DAG gets corrupted (see screenshot below), the safest way to fix the issue is by reseeding the database.

Note that this might cause high network utilization while the database is transferred over through the network, if the passive DAG member server located in a different site, the WAN can be saturated!

To reseed the database copy, use one of the following cmdlets:

# Reseed (while following the progress on the screen)
Update-MailboxDatabaseCopy DB01\MB2 -DeleteExistingFiles

# Reseed in the background
Update-MailboxDatabaseCopy DB01\MB2 -DeleteExistingFiles -BeginSeed

After the process is done, the database copy shows as healthy again!

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