Adapter Hardware And Battery-Backed Cache - HP D5970A - NetServer - LCII Installation And Configuration Manual

Chapter 1
HP NetRAID-1 Devices Per Channel
Channel Internal Connection
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* External storage with the HP Storage System/6 supports a maximum of six Fast/Wide
SCSI devices, while external storage with the HP Rack Storage/8 supports a maximum of
eight Fast/Wide or Ultra/Wide SCSI devices.
HP NetRAID-1 External SCSI Cable
Channel External SCSI Cable
D3637C or D6020A
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If the necessary cable is 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

Adapter Hardware and Battery-backed Cache

IOP: The IOP (I/O Processor) for the HP NetRAID and HP NetRAID-1 adapters
is the 32-bit Intel i960CA RISC processor running at 33 MHz. The IOP for the
HP NetRAID-3Si adapter is the 32-bit Intel i960RD Intelligent I/O RISC
processor running at 66 MHz. The processor directs all functions of the adapter,
including command processing, PCI and SCSI bus transfers, RAID processing,
drive rebuilding, cache management, and error recovery.
ASIC: A custom ASIC (Application Specific Integrated Circuit) provides PCI
bus mastering with a burst data transfer rate of 132 MB/sec. The ASIC handles
data transfer between the PCI bus, the cache, and the SCSI bus. This ASIC
supports memory write and invalidate commands on the PCI bus. It also performs
RAID mirroring, parity generation, and checking in RAID levels 1, 3, 5, 10, 30,
and 50.
Cache: All HP NetRAID Series adapters have cache memory.
For the HP NetRAID adapter, cache memory resides in a 4 MB battery-
backed 60-ns FPM (Fast-Page Mode) DRAM SIMM. You can replace the
this SIMM with a 16 MB DRAM SIMM and add one additional 16 MB
DRAM SIMM to provide 32 MB of cache memory.
For the HP NetRAID-3Si adapter, cache memory resides in a 16 MB
battery-backed 60-ns EDO (Extended Data Output) DRAM SIMM.
External Connection *
6 or 8
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Introduction
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