Hi - One of our customers are using SLES on IBM blades, connected to the storage via FCP, with no internal dribes installed on these blades.
There are a few tricks to be aware of, but for over two years now, we have not had any failure on OS level.
If it was my systems, I would definetely consider of staying on SLES, wether it be 10 or 11. To upgrade from 10 to 11 on the outher hand should not be a problem, especially if your boot disks also reside on SAN.
If you are using FC, you can create a boot LUN, on SLES 10, and upgrade it to 11, to see what can go wrong, and if it works, roll it out to your other servers.
We are using Redhat ( various versions ) and Netapp. We are not using any FC support to Netapp except for Media agents for CommVault to a VTL. That having been said; the NFS part should be good. We have had no problems with Oracle under RHEL 3,4 and 5 and NFS. Based on my FC experience with Cisco and Hitachi, I doubt there would be much problems with FC.
I don't see much of a differace between CentOS and RH except from support/version number issues. They are still a recompile of RH right?
But I would ask a follow up question or two, NFSv2? Fiber channel? What is the hardware? Is it on the support matrix?