Hi I wonder if you can help as I am totally stuck and scratching my head.
We have an Exchange environment running on Hyper-V 2012 virtual servers (Exchange 2010) with 3 CAS / HT servers and 3 Mailbox servers in our DAG. Always at a certain time of the day say for example 2pm GMT - messages for certain databases slowly begin to queue - eventually the queue clears out and normal mail flow continues - but this is causing chaos for us and I'm struggling to get my head around it.
We are patched to the latest version - Sp3 Update 12
We have excluded all exchange paths and processors from AV scanning
We have increased the memory from 16GB to 32GB for CAS/HT and 32 to 64 for DAG Servers
We have modified the edgetransport.exe config file adding an additional 2 lines in:
<add key="RecipientThreadLimit" value="2" />
<add key="MaxMailboxDeliveryPerMdbConnections" value="3" />
We cannot see anything obvious in the event logs that can help us progress this. Any assistance at all would be greatly appreciated.
sli001ino