Do not create partitions on the FX devices. If the FX devices will be used in the MSCS environment, you must write a signature on each FX device. If not, do not write a signature.
You must write a signature on each SCSI disk device to enable the Windows system to vary the device online. For MSCS environments, you must also write signatures on the FX and other raw devices. The 32-bit signature identifies the disk to the Windows system. If the disk’s TID or LUN is changed, or if the disk is moved to a different controller, the Disk Management and Windows fault tolerant driver will continue to recognize it.
Microsoft Windows assigns disk numbers sequentially, starting with the local disks and then by adapter, and by TID/LUN. If the storage system is attached to the first adapter (displayed first during system start up), the disk numbers for the new devices start at 1 (the local disk is 0). If the storage system is not attached to the first adapter, the disk numbers for the new devices start at the next available disk number. For example, if 40 disks are attached to the first adapter (disks 1–40) and the storage system is attached to the second adapter, the disk numbers for the storage system start at 41.