HP LH4r Integrated HP NetRaid Controller Configuration Guide - Page 8

Controller Hardware

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Chapter 1 Introduction For each HP NetRAID channel, you can have either one internal, or one external connection. • The HP NetServer LH 3/LH 3r hot-swap mass storage cage supports up to six Ultra2 disk drive modules. • A second hot-swap mass storage cage can be installed in your HP NetServer LH 3/LH 3r which supports an additional six Ultra2 disk drive modules. • External storage with the HP Storage System/6 supports a maximum of six Fast/Wide SCSI devices. • External storage with the HP Rack Storage/8 supports a maximum of eight Fast/Wide or Ultra/Wide SCSI devices. If the necessary cables were not supplied with your system, see HP's Order Assistant for ordering information. Order Assistant is available on the Internet at http://www.hp.com/go/netserver. Controller Hardware IOP: The IOP (I/O Processor) for the integrated HP NetRAID controller is the 32-bit Intel i960RDTM Intelligent I/O RISC processor running at 66 MHz. The processor directs all functions of the controller, including command processing, PCI and SCSI bus transfers, RAID processing, drive rebuilding, cache management, and error recovery. Cache: Cache memory resides in a 16 MB 50ns EDO (extended data output) DRAM SIMM. The integrated HP NetRAID controller supports Direct and Cached I/O and Write Through or Write Back caching, which can be selected for each logical drive. To improve performance in sequential disk accesses, the integrated HP NetRAID controller uses Adaptive Read Ahead caching by default, but it can be disabled to Normal or set to simple Read Ahead caching. 2

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Chapter 1
Introduction
2
For each HP NetRAID channel, you can have either one internal, or one external
connection.
•
The HP NetServer LH 3/LH 3r hot-swap mass storage cage supports up to
six Ultra2 disk drive modules.
•
A second hot-swap mass storage cage can be installed in your
HP NetServer LH 3/LH 3r which supports an additional six Ultra2 disk
drive modules.
•
External storage with the HP Storage System/6 supports a maximum of
six Fast/Wide SCSI devices.
•
External storage with the HP Rack Storage/8 supports a maximum of
eight Fast/Wide or Ultra/Wide SCSI devices.
If the necessary cables were not supplied with your system, see HP's Order
Assistant for ordering information. Order Assistant is available on the Internet at
.
Controller Hardware
IOP:
The IOP (I/O Processor) for the integrated HP NetRAID controller is the
32-bit Intel i960RD
TM
Intelligent I/O RISC processor running at 66 MHz. The
processor directs all functions of the controller, including command processing,
PCI and SCSI bus transfers, RAID processing, drive rebuilding, cache
management, and error recovery.
Cache:
Cache memory resides in a 16 MB 50ns EDO (extended data output)
DRAM SIMM.
The integrated HP NetRAID controller supports Direct and Cached I/O and
Write Through or Write Back caching, which can be selected for each logical
drive. To improve performance in sequential disk accesses, the integrated HP
NetRAID controller uses Adaptive Read Ahead caching by default, but it can be
disabled to Normal or set to simple Read Ahead caching.