I am in the process of installing Update 1 of vSpere 5.1 for 1 of my customers. I have been upgrading the vCenter appliance and am now upgrading the ESXi 5.1 cluster hosts one by one.
For most of the machine the update goes without a flaw. But 1 of my machines has a problem: It cannot see the iSCSI LUNs! All configuration is still OK (VMHBA34, all settings) and when logging in on the console, I can still ping the iSCSI NAS. Target discovery also seems to work, but no LUNs are seen by this host.
What can be the issue and how can I troubleshoot this?
Regards,
Stephan van der Plas