After I updated one of my ESXi 5.0 hosts with latest updates downloaded by Update Manager this host can no longer attach to my iSCSI storage, the storage is a FreeBSD zfs volume supplied by istgt!
The other host has no problem while the updated host not only is unable to connect to existing storage but also unable to create new. When I start Add storage it finds the volume but then it takes "forever" until it finds any information and then I create a new vmfs volume but this task times out after a long time with following error:
"Call "HostDatastoreSystem.QueryVmfsDatastoreCreateOptions" for object "<object>" on vCenter Server "<server>" failed."
The same error is issued if I try to add existing storage but then the error message comes just after volume info is displayed.
I would say that there is something wrong with one or more of the latest patches so my suggestion is to be very careful when applying those patches.
/David