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SQL 2012 Database Mirroring Issue is stalling

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hi All, 

I have a SQL 2012 Enterprise Primary and DR SQL Clusters. 
I have a 500 GB TDE Enabled Using HSM SQL DB which I have mirrored across to DR. 

I am noticing that my Logs are shipping to DR, but the Unrestored Log size is huge and My restore rate is about 0 - 80KB/Sec. This is Causing the unrestored Log to grow on the DR side. 

I also notice at times my Unsent Log is also getting big after any DB Maintenance activities (such as rebuild of indexes). 

I have a dedicated connection between my datacenters and the traffic thruput is quite reasonable and I am able to copy out a 2GB File across within a few minutes. I see no packet drops within my links. 

How do I ensure that my unsent logs are copied out and also increase my restore rate in DR side. 

Any help / Suggestions will be much appreciated.   

Regards 
Aravin. 

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