Volume Replication

[salmon]

Currently all replication tasks use only one NIC but You can create bonding and run replication on it.

[lk-ooe]

Thank you for the Tip.

I have create a blance-rr bond for the Volume Replication with two Nics, but this does not increase the throughput, the write-io with active replication is is still at 110 MB.

[salmon]

During creation of volume replication task you can set option: " Bandwidth for SyncSource (MB)". By default it's set to 40 MB. To change this value you have to delete this task and create it again.

[lk-ooe]

There is a knowledgebase article: Why Open-E request to specify bandwidth value for volume replication? http://kb.open-e.com/Why-Open-E-requ...ation_172.html

"Once the destination volume show consistent, replication will use maximum possible bandwidth."

So the Option "Bandwidth for SyncSource" should not impact the Bandwidth, when the Volume is consistent.

[salmon]

hmm, I didn't know that.

Ok, could you try one more thing? Shutdown secondary machine and see if speed will also increase to 220 MB.

[lk-ooe]

When the secondary Machine ist shutdown, the speed with IOMeter also increase from 110 to 220 MB. Apparently only the Replication slow down the througput.

[salmon]

Ok, You can try change some tuning options. In console go to Hardware Configuration (ALT + CTRL + W) and choose "DRBD tuning".
Here you can find some info about available options http://www.drbd.org/users-guide/re-drbdconf.html

I learned today that balance-rr and replcation doesn't always work as expected. The perfect solution would be using 10Gb ethernet cards, but probably this is not an option?