ESX 4 boot fails at vsd-mount

Hi,

we have two ESX4 hosts connected to an IBM DS3400 storage system.

With FC cables plugged in both the ESX stops booting at vsd-mount.

With FC cables pulgged out, the ESX boot is ok.

After the ESX is up and running, if i plug the fc cables i can see and succesfully work with my storage LUNS, as well starting al VM.

At any reboot i have to unplug fc cables to allows esx to came up! The problem is the same on both servers.

The problem happens in all cases with or without any lun presented to the esx.

Any ideas?

Thanks.