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tolinromeFlag for United States of America

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san traffic vs network traffic

I have a physical host that is connected to a SAN via fibre channel (through san switches of course). The physical host is also connected to the network via ethernet cable. I'd like to know what determine what traffic goes through which connection.

Is the fibre channel only using disk i/o and network traffic only th ethernet cable? Can someone explain? Thanks.

Also, what if the host is an ESX host compared to a regular server host. How do the VM's play into that?
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coolsport00
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Thanks, but how is SCSI traffic also FC traffic? Arent they two different technologies\protocols?
It's not :) I just meant data traffic. Yes, they are different. Sorry for the confusion...

~coolsport00
If you want to be specific, FC or iSCSI (or FCoE) are protocol methods themselves, that "packages" SCSI commands in them to transfer data. iSCSI uses TCP/IP to pkg SCSI commands and FCoE uses a converged technology...using a CNA adapter to capture SCSI commands wthin a FC packet and uses Ethernet to transfer the SCSI commands. SCSI is not really a protocol itself but a set of standards to transfer data (http://en.wikipedia.org/wiki/SCSI).

The vSphere Storage Guide can also help clarify concepts a bit more for you:
http://pubs.vmware.com/vsphere-51/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-51-storage-guide.pdf

~coolsport00
Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Fibre Channel traffic communicates through a special FC HBA. (FC network card!)
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Thanks for the clear explanations.