I found the following error in worker log:
2014-03-08T15:19:32.353-06:00 [02676 info 'Default'] Building partition list: Can't have more then one active partition on a disk.
2014-03-08T15:19:32.353-06:00 [02676 info 'Default'] Failed to create the partition Tables error:-1
Also If you are using RAID, this should be a problem - the RAID are not supported at all, see user manual.