HP A7143A RAID160 SA Controller Support Guide, February 2007

Hard Drive Installation and Replacement
Background
Appendix C
100
Background
Each SCSI channel on the RAID160 SA controller supports up to 14 physical disks. Disks can be of the
Ultra320 or the Ultra160 type.
Each physical disk on a SCSI bus must have a unique ID value in the range of 0 to 15 (except ID 7, which is
typically reserved for controller use). This value is set automatically on hot-pluggable disk drives in the
storage systems that are supported by the RAID160 SA controller.
• Do not terminate the disk drives. HP servers and internal cabling provide the required termination of the
SCSI bus.
• Do not use disk drives of different capacity in the same array. The excess capacity of larger disk drives
cannot be used by the array and is wasted.
• Do not use hot-pluggable disk drives on the same SCSI bus as non-hot-pluggable disk drives.