Active Active Replication performance

[Pi-L]

You probably mean resync speed, or initial sync speed. Speed is adaptive and managed by internal mechanism of volume replication not to interrupt other services. It is possible to control some of volume replication parameters in console -> Ctrl+alt+W -> Drbd tuning, but usually its best to leave default ones.

[gharding]

I am talking about the normal replication traffic in an active-avtive cluster when all is working correctly. I am using iometer on a windows machine to test the performance of the iscsi volumes, when running in degraded mode I am getting 1939 MBs writes with iometer, when running in normal mode it drops down to 500MBs

[Pi-L]

Have you verified that any of the things mentioned here is not the factor?

http://kb.open-e.com/Data-access-is-...task_2483.html