VMware vSphere ESXi 5.1 was released last month, after upgrading my hosts I had some really annoying issue’s, I couldn’t connect my iSCSI (QNAP) datastores and the hosts failed with a PSOD.. once I checked the HCL at the VMware website I saw that my HP DL360 G5 isn’t supported anymore.. time to rollback the latest installation.
(Re)boot the host and press R to start the Recovery Mode..
HYPERVISOR2: 5.1.0-799733 (Default)
CURRENT DEFAULT HYPERVISOR WILL BE REPLACED PERMANENTLY
DO YOU REALLY WANT TO ROLL BACK?
Press Y to start the roll back
The host is downgraded and back online again with VMware vSphere ESXi 5.0.0