Adapter Hardware And Battery-Backed Cache - HP P3410A - NetRAID 1M RAID Controller Installation And Configuration Manual

Chapter 1

Adapter Hardware and Battery-backed Cache

IOP: The I/O processor (IOP) directs all functions of the adapter, including
command processing, PCI and SCSI bus transfers, RAID processing, drive
rebuilding, cache management, and error recovery.
The IOP for the HP NetRAID-1M adapter is the Intel i960RM
I/O RISC processor running at 100 MHz.
The IOP for the HP NetRAID-2M adapter is the Intel i960RN
I/O RISC processor running at 100 MHz.
The HP NetRAID-1M adapter has a 32-bit, 33 MHz PCI Bus Interface. The
HP NetRAID-2M adapter has a 64-bit, 66 MHz PCI Bus Interface.
Cache: All HP NetRAID-1M and 2M adapters have cache memory.
For the HP NetRAID-1M adapter, cache memory resides in a 32-MB
SDRAM DIMM with ECC.
For the HP NetRAID-2M adapter, cache memory resides in a 64-MB or
128-MB SDRAM DIMM with ECC, depending on the model purchased.
The HP NetRAID-1M or 2M adapters support 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 HP NetRAID-1M and 2M
adapters use Adaptive Read Ahead caching by default, but it can be disabled to
Normal or set to simple Read Ahead caching.
Battery: Battery backup of the cache is standard for the HP NetRAID-2M
adapter. It is not available with the HP NetRAID-1M.
Alarm: A tone generator on the HP NetRAID-1M and 2M adapters provides
audible warnings (alarms) when RAID system errors occur.
4
Introduction
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