So you have your lagged copy of the database and obviously your functional copy. the number of DAG members is irrelevant for my question but lets say 3 or more

Now the database becomes corrupt for whatever reasons which inherently means the passive copies would now be corrupt too because replication, correct?

Of course the lagged copy would not be, let’s say i wish to activate using the safetynet approach, i suspend the database, make a copy, remove the logs, disable the service on the other DAG members and finally mount it with the appropriate command. All successful

Now what is the best plan of attack with the other DAG members which are now not replicating anything because the service is stopped? Would it be remove there copy of the corrupt database, re-enable the service and start a re-seed?

Or would the replication service see the recovered version using the lagged database as being the authoritative copy and replicate everything over the top (of course once it was up to date)

I only ask as disabling that service across all DAG members with a copy would have a high impact on your resiliency and would affect all other healthy databases

Thanks Paul,
but in mine case none of conditions are meeting, the only diffrenece i see as mentioned above “ReplayLagStatus : Enabled:False”. why is it showing replay lag status false? and how to change this?
our understanding is when we set the lag replay time this status should automatic become true. Suggestion!?

On this page (https://technet.microsoft.com/en-us/library/dd335158(v=exchg.150).aspx) search for “automatic log replay”, there are some conditions where Exchange 2013 will automatically replay logs on the lagged copy.

quick question – i have 180 lagged copy databases set with 14 days lag but i found the logs are getting replayed like passive, only few databases are holding the logs. based on verfification found this staus difference between both (working lag and not working lag copy). can you please help what am missing here? Thank you.

Name : MDB177\CEN308-MSG-MR12
ReplayLagStatus : Enabled:False; PlayDownReason:LagDisabled; ReplaySuspendReason:None; Percentage:0;
Configured:14.00:00:00; MaxDelay:1.00:00:00; Actual:00:00:27

we use a 4 copies DAG, with one copy lagged for 3 days. If we activate the lagged copy in case of a virus attack we want to prevent the safetyNet to resend all messages (including that with the virus).

How can we do that? Is there a “switch” to disable the safetyNet without cleaning up all transport service databases?

Robert

If you’re worried about losing the lagged copy you could add another lagged copy, sure.