Should separate you network traffic and storage?

To give some background, we use FCoE, and each server has 6 adapters. The way it was intended was 2 for network, storage 2 and 2 to the DMZ. The subject was brought on the use of network and storage 4 to increase the flow.

Could someone point me to the best practices of the present or advice if they believe that it should be separate or combined?

Thank you

I always recommend using a disparate network for IP storage (or at least one VLAN unique), unless you have some really strong QoS that will ensure you packets of storage (as with something like a blade case). The problem is that storage is much more sensitive to latency as (most) network traffic, and contension could cause significant problems.

http://blogs.VMware.com/Networking/2011/11/VDS-best-practices-.html

IP storage traffic is via the ports of vmknic and this traffic varies with disk i/o requests. More data are transferred to configuration-to-end jumbo frame, with each Ethernet frame, reducing the number of images on the network. Plu framework reduced the load on the servers and targets and improves the performance of IP storage. Congested and low speed networks can cause latency issues that disrupt access to storage over IP. It is recommended to provide path at high speed for IP storage and avoid any congestion in the network infrastructure.

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