The disk groups will have to be created manually. Disks are automatically claimed when ESXi flags them as "local". Many SAS controllers allow disks to be shared. If ESXi determines that the disks are shared, it does not report them as "local". Shared disks are currently not supported in Virtual SAN 1.0 and are reported as not local or "Is local:false". However, some disks are reported as shared but are actually not shared, in that case you will need to mark them "as local". This applies to both magnetic disks(HDD) as well as solid state disks (SSD).
