After I placed two new 146 GB SAS hard disks to an ESXi 4.1 host, configured a new array, try to add a new datastore with my vSphere Client I received this warning:
Call “HostDatastoreSystem.QueryVmfsDatastoreCreateOptions” for object “ha-datastoresystem” on ESXi “SERVERNAME” failed.
After reading VMwareKB 1008886 and following the instructions I solved the issue..
dd if=/dev/zero of="/vmfs/devices/disks/vml.0000000000766d686261313a313a30" bs=512 count=34 conv=notrunc
34+0 records in 34+0 records out
More information: VMware