Backup of passive node of Microsoft Exchange Database Availability Group does not truncate transaction logs
Challenge
Microsoft Exchange VSS writer reports zero databases in its metadata on the passive node.
Microsoft Exchange Replication service VSS writer is disabled and it is not present in the list of VSS writers (vssadmin list writers) on both active and passive nodes.
Solution
Open Registry Editor and navigate to
HKEY_LOCAL_MACHINE\Software\Microsoft\ExchangeServer\v14\Replay\Parameters (Exchange 2010)
HKEY_LOCAL_MACHINE\Software\Microsoft\ExchangeServer\v15\Replay\Parameters (Exchange 2013)
Change DWORD value named EnableVSSWriter from 0 to 1.
Then restart the Microsoft Exchange Replication service.
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