HP NetRAID 1 Controller - Manual (Page 7)

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HP NetRAID and HP NetRAID-1 Adapter
Features
HP NetRAID and HP NetRAID-1 are high performance, intelligent PCI-to-SCSI host adapters with
RAID control capabilities. Up to three SCSI channels are available on the HP NetRAID adapter; one
SCSI channel is available on the HP NetRAID-1 adapter. Each channel can support a maximum of
six or eight Fast/Wide SCSI or Ultra/Wide SCSI devices.
This section describes each adapter feature. Features are grouped together by category, as follows:
A. Hardware Features
B. RAID Management Features
C. Monitors Feature
D. Check Consistency Feature
E. Online Capacity Expansion Feature under Novell NetWare
F. Online Capacity Expansion Feature under Microsoft Windows-NT
G. Alarm Feature
H. Power Fail Safeguard Feature
I. Autorebuild Feature
A. Hardware Features
The following hardware specifications apply to the HP NetRAID and HP NetRAID-1 adapters:
CPU
The adapters use the 32-bit Intel i960CA RISC processor running at 33 MHz. This processor directs
all functions of the adapter including command processing, PCI and SCSI bus transfers, RAID
processing, drive rebuilding, cache management, and error recovery.
Cache Memory
The HP NetRAID adapter has two SIMM sockets, using × 36 (72-pin) 60/70 ns SIMMs. The two
SIMMs are interleaved and operate in page mode. The standard configuration is 4 MB of cache
memory (a single SIMM is installed).
The HP NetRAID-1 adapter has one SIMM socket, using a single × 36 (72-pin) 60/70 ns SIMM.
The standard configuration is 4 MB of cache memory (a SIMM is installed).
The adapters cache support Write-Through or Write-Back caching for Write Policy, and Read-
Ahead, Normal, or Adaptive caching for Read Policy. The defaults are Write-Through and Adaptive.
Custom ASIC
This ASIC (Application Specific Integrated Circuit) provides PCI bus mastering with a burst data
transfer rate of 132 MB.
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 parity
generation and checking in RAID levels 1, 3, 5, 10, 30, and 50.