HP D7171A - NetServer - LPr Manual page 4

ZKLWHýSDSHU
+ 3 ý 1 H W 6 H U Y H U ý $ F F H V V R U L H V
Controllers
Controllers (or adapters) are devices that manage the communication interface by adapting
or bridging the data from one I/O bus to another. As an added benefit, controllers can also
organize and protect the data stored on the disks through mirroring, duplexing and/or RAID
techniques. The implementation of these data protection techniques is discussed in the
next section of this paper and on page 8.
Controllers are available in three different form factors:
Embedded on a motherboard
As a card in a standard bus slot
Incorporated into an external storage unit
Examples of each of these forms include:
Embedded
Adapter Cards
Incorporated in an external storage unit
SCSI I/O chips
Embedded RAID in the HP NetServer LH 3 and LH 4 using SCSI I/O chips and a
microprocessor
HP NetRAID which adapts (or bridges) between PCI and SCSI and also provides
RAID
HP FC HBA (Fibre Channel Host Bus Adapter) which adapts between PCI and FC
HP SCSI HBA which adapts between PCI and SCSI
HP FC Array which adapts between FC and SCSI and also provides RAID
4