There is an IBM BladeCenter H with 2 Brocade fiber switches. There are 14 internal ports and 6 external ones. Each port is 4Gbps. There is also a fiber channel SAN (IBM DS4700, 15k SAS disk) with 2 controllers. Each controller has 4 fiber ports. Each port is 4Gbps. The plan is to install ESX4 on 2 HS22 blade server. If the blade server runs 10 virtual machines, then each virtual machine can only get 4Gbps/10=400Mbps which is a lot slower than local SATA disk.
Q#1. How to estimate the fiber channel bandwidth between blade server (ESX4) and the fiber switch? Is it practical to average the total bandwidth by the number of virtual machine and compare it to the bandwidth provided by local disk such as SATA or SCSI or SAS?
Q#2. If the fiber channel expansion card is dual port (4Gbps each), is it possible to get 4Gbps x2 = 8Gbps bandwidth for the blade server (ESX4)? If yes, how to configure it without upgrading the Brocade fiber channel switch?