Circular Logging in exchange 2010

Question

1.      
How to enable circular logging in Exchange 2010 while is in DAG in place.
2.      
When enable it will it clear my Transaction Log automatically?
Regards

Answer 1

The Exchange Management Shell can be used to determine which mailbox databases are enabled for circular logging by running the following command.
[PS] C:\>Get-MailboxDatabase | where {$_.CircularLoggingEnabled -eq $true}
Name Server Recovery ReplicationType
Mailbox Database 02 EX1 False Remote
Mailbox Database 04 EX2 False None
Another technique is to list all mailbox database sorted by their circular logging settings.
[PS] C:\>Get-MailboxDatabase | select name, circularloggingenabled | sort circularloggingenabled -desc | ft -AutoSize
Name CircularLoggingEnabled
Mailbox Database 04 True
Mailbox Database 02 True
Mailbox Database 01 False
Mailbox Database 03 False
Here is a method that can be used to disabled circular logging on each of the mailbox databases. Because the change doesn’t take effect until the mailbox database is dismounted and mounted again, this method also performs that task.
Caution: this may cause a disruption to mailbox access for your end users, so I do not recommend running this outside of maintenance windows.
Firstly, read the mailbox databases that have circular logging enabled into an array.
[PS] C:\>$dbs = Get-MailboxDatabase | where {$_.CircularLoggingEnabled -eq $true}
You can see now that the two mailbox databases are in the array.
[PS] C:\>$dbs
Name Server Recovery ReplicationType
Mailbox Database 02 EX1 False Remote
Mailbox Database 04 EX2 False None