If you're receiving this error when trying to create a new datastore on an ESXi server:
Call “HostDatastoreSystem.QueryVmfsDatastoreCreateOptions” for object “ha-datastoresystem” on ESXi failed
You may need to "re-initialize" the disk. To do so, start the SSH service on your host and connect using Putty or another SSH client. The command to manipulate partitions on ESXi is partedUtil. Here's an example of it's usage:
partedUtil mklabel /dev/disks/naa.6d4ae5208f875700172a910c5402c983 msdos
The disk identifier will be referenced in the ESXi error message. Be careful with this command, it is "destructive" and you will not even be prompted for confirmation.
