I had a few clusters-across-boxes on my ESX-servers, and as Vmware described in its guides, I used RDM's.
The result of that was that I wasn't able to add nor create vmfs's anymore. Vmkwarning logs showed SCSI-reservation errors, what didn't suprise me as the MS-cluster-service does this, but I couldn't understand that the VI-client timed out on this.
After long search and consulting some college's we came to the idea to increase VI-client timeout settings. (You can find it in the Edit menu of the VI-client, called client settings, remote command timeout) And ofcourse that did the trick, so conclusion : problems are hard, solutions easy !
