Explanation/Reference:
Explanation:
Lagged copy play down behavior is disabled by default, and can be enabled by running the following command.
Set-DatabaseAvailabilityGroup <DAGName> -ReplayLagManagerEnabled $true
After being enabled, play down occurs when there are fewer than 3 copies.
Lagged copies can now care for themselves by invoking automatic log replay to play down the log files in certain scenarios:
* When there are fewer than three available healthy copies (active or passive) for more than 24 hours
* When a low disk space threshold is reached
* When the lagged copy has physical corruption and needs to be page patched Reference: Lagged Mailbox Database Copy-Exchange 2013 Enhancements
http://exchangeonline.in/lagged-mailbox-database-copy-exchange-2013-enhancements/