Disappointing performance of 10gbe - HELP!

So, we have recently implemented a new ESX/iSCSI environment and we find that the performance degradation that we were in our 1gbe multichannel environment.

We have 3 x Dell R910 servers with 2 x Intel Dual Port 82598EB 10 gb CX4 NIC each.

Each of the servers are connected to a Force10 C300 switch. We use port 1 on each NETWORK card in each server iSCSI traffic and each of them is connected to a separate Force10 C300. The C300 are then cross connected.

We have 2 x Dell Equallogic PS6510 tables are also connected to the two chassis C300.

We have a separate vSwitch configured on each host and a wrench VMK for each physical iSCSI NIC we use extended frames and are capable of vmkping a jumbo to the portal framework and target each address on the without any problem.

When running performance tests in redhat using dbench we see only around 550 MB/s of flow either directly to the vmdk local disk that is stored on a data store multi-channel alternating or using a software in Redhat iSCSI initiator also multipathing.

We hung our old without comparison and in a similar configuration in the contrary case, we see a 630 mb/s compatible out of our ESX host using 4 x 1gbe between the host and the switch and 3 x 1 GbE to the PS5000.

Then, with only 4 1gbe NIC host and 3 1gbe NIC on a table with 32 less readers that we are seeing an INCREASE of 80 MB/s in performance on our new hardware 10gbe... what gives?

During the passage of the selection policy of Round Robin Fixed path on the data store see us speeds drop to nearly 130 MB/s

I think that we must be missing some configuration step huge to see this terrible execution.

Ideas?

Have you considered that the bottleneck may not be network support?   What makes you sure that your storage system can provide more I/O as your Gigabit network delivered?

Tags: VMware

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