Exchange 2013, it's just starting after migration from 2010 to 2013.

Replay Queue length in specifed passive DBs which is healthy has been growing rapidly in business

hour, however Copy Queue length is ok.

And it's not decreasing them at all in business hour, I'm serching for the cause for that,

MBX server performance, Disk I/O or networok... need help.

Even if that's night time, it looks that specified DBs on one server it has long replay Queue length logs.

• Edited by tanale 20 hours 24 minutes ago

Hi 

Please run Get-MailboxDatabaseCopyStatus  and see the results about the last reply log time , copy log time etc.

Also try updating the affected DB copy and see the results

HI tanale,

Seems log files are copied to the passive copies of the mailbox databases. But the log files are not replayed to the passive database.

Please verify "Don't mount this database at startup " check box selected on the database. If yes please uncheck it.

Regards

Look at the speed of the disks as this was the cause of these exact same symptoms in the environment of one client. They were advised by HP that SATA disks in a 3par storage cabinet would be fast enough, but they weren't. We migrated the DBs to SAS disks and the issue resolved.

I verified that it's not checked.

Hi ,

Please run the below mentioned commands and share me the results .

1.Get-MailboxDatabaseCopyStatus -Identity "DB1\SERVER1" | fl name,*erro*

You need to mention the name of the DB which is having the large replay queue length.

2.Test-ReplicationHealth | fl

On the problematic server please run the above mentioned command and share me the error message which is coming up on the parameter "DBLogReplayKeepingUp"

3.Please check the application event logs and the logs which is under the high availability.

4.Make sure you have the enough space on the drive where the passive copy resides.