We are getting a similar issue, and have noticed when doing an iometer test we can get good write performance without replication but with replication we lose about 50% performance. We test with windows product and the replication almost max's out the 10GB used for replication.
We have tried different raid controllers from LSI, and Adaptec all with SSD cache.
We have tried the DRDB tuning and jumbo frames but no improvement
Any suggestions would be appreciated as we are wanting to put this into production but cant until we have this resolved
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