Copy queue length: Indicates the number of log files waiting to be copied to the selected database copy. This field is relevant only for passive database copies. Replay queue length: Indicates the number of log files waiting to be replayed into the selected database copy. This field is relevant only for passive database copies.

Jul 12, 2020 Event ID: 4110 Source: MSExchagneRepl After the copy queue length drop below the threshold, it will resume the log replay automatically. We couldn't increase the the threshold for copy queue length, it is by design. Possible cause 1. Network issue 2. Search index You can try reseeding the DB once and see the results: Suspend-MailboxDatabaseCopy \ Then update Cannot Activate Database Copy: Content Index Catalog Files Dec 01, 2010 Reseed Failed Mailbox Database Copy in Exchange Server

Configure mailbox database copy properties | Microsoft® Docs

Oct 25, 2013 Exchange 2010 CQL(copy queue length) issue | Outlook Aug 15, 2016 Amazon® SQS delay queues - Amazon Simple Queue Service

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Exchange DagrePlay Queue Length Show Continious 1 Dec 17, 2012 Microsoft Exchange Mania: Exchange Queue Length Nov 14, 2012 Managing mailbox database copies: Exchange 2013 Help Have a replay queue within 10 minutes of the replay lag time. Have a copy queue length less than 10 logs. Have an average copy queue length less than 10 logs. The average copy queue length is computed based on the number of times the application has queried the database status. SecondDatacenter