My hostd.log file on vSphere 5 says that partedUtil is timing out while trying to write the partition table on an iSCSI target being served from OpenIndiana/napp-it.
I read that sized over 2TB give problems, so I sized the volume to 500GB.
I tried mounting the target in Ubuntu 11.04 with open-iscsi and it worked, so this seems to be an issue with the vSphere implementation of iSCSI or not?