First, I'm not a SAN guy, but I have been asked to trouble shoot some performance problems we are having in our SAN enviornment.
What we have is:
Hosts_Group01 < -- 2 Gbps -- > |--------------|
| FC Switch |< -- 4 Gbps -- > SAN Controller < -- 2 Gbps -- > 4 Gbps capable FC/SATA Disks
Hosts_Group02 < -- 4 Gbps -- > |--------------|
Hosts_Group01 have servers that only have 2 Gbps capability, hosts in Hosts_Group02 have and are connected at 4 Gbps.
The SAN controller is connected to the FC switch at 4 Gbps.
The SAN controller has the capability to connect to the Disks at 4 Gbps, but at the moment it is configured to run only at 2 Gbps.
This was done because it is believed that the SAN Controller to disks must run at or below the slow host speed. I was told that if we change so that the SAN controller to Disks run at 4 Gbps we could get data corruption.
Now my background is networking and this makes no sense to me in a switched environment.
I'm I crazy or should we be able to change the SAN controller to disk to 4 Gbps?