After upgrading one of our esx hosts from 5.1 to 5.5 (update1, rollup 2) the server does not see the fibre channel adapter. looking at the back of the server, the FC Adapter is powered. Looking in the bios i see the FC Adapter, but Esx does not. I've checked if it's compatible with esx and it is. We already upgraded one server before and that went fine.
The server is a HP DL360 G6, with a HP StorageWorks FC2142 4Gb PCI-e (other servers that are still on 5.1 see the adapter as a LPe1150 4 GB Fibre Channel Host Adapter)