HP NetRAID Installation and Configuration Guide

Chapter 1 Introduction
6
SCSI Termination and Firmware
Termination: Active termination on the SCSI bus conforms to Alternative 2 of
the SCSI-2 specifications. Termination enable/disable is automatic through cable
detection.
Firmware: The HP NetRAID Series firmware handles all RAID and SCSI
command processing and also supports the following functions:
• Disconnect/Reconnect feature optimizes SCSI Bus seek.
• Tagged Command Queuing allows multiple commands to be sent to the
controller, thus improving random access.
• Scatter/Gather supports multiple address/count pairs.
• Multi-threading supports up to 255 simultaneous commands with elevator
sorting and concatenation of requests per SCSI channel.
• Stripe size for each logical drive can be set from 2 KB to 128 KB.
• Multiple rebuilds and consistency checks have user-definable priority.
New Features of HP NetRAID Series Adapters
New features of HP NetRAID Series adapters include:
• Enhanced Array Spanning
• Enhanced Configuration Replication
• Support for Clustering (HP NetRAID-3Si only)
• I
2
O Support
Enhanced Array Spanning
The HP NetRAID Series adapters allow up to four arrays to be spanned together
as one logical drive. For example, HP NetRAID Series adapters can support a
RAID 10 logical drive with up to eight physical disks. HP NetRAID-3Si adapters
that use all three channels can group a maximum of 18 to 32 physical disks in a
RAID 30 or RAID 50 logical drive depending on the HP system and enclosure
used.
Enhanced Configuration Replication in HP NetRAID Assistant Utility
When you save a configuration using the HP NetRAID Assistant utility,
HP NetRAID-3Si adapters now save both logical drive and adapter configuration