vSphere 4.1 RDM unable to boot VM

[To-M]

Also are there any errors in the ESX server in the the /var/log/vmkwarning.log file of the or the /var/log/messages.log file - something like below?

WARNING: SCSI: CheckPathReady:2941: CheckUnitReady on vmhba2:3:13 returned I/O error 0x0/0x2 sk 0x2 asc 0x0 ascq 0x0

[jsinclair]

Having this same issue. All my VM's in vSphere 4.1 (ESXi 4.1) that have iSCSI RDM's mapped lock up on boot and I have to reboot the ESX server. If I remove the RDM, the VM will startup but as soon as I attach the RDM LUN, it locks up. Any ideas? This just all of a sudden started happening last night. Both my Open-E servers were running for 540+ days without any issues..