Integrated HP NetRAID Controller Config. Guide

Chapter Introduction
5
Integrated HP NetRAID Firmware
The integrated HP NetRAID controller 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.
Array Spanning
The integrated HP NetRAID controller allows a logical drive to span (occupy
space in) up to four arrays. For example, the integrated HP NetRAID controller
can support a RAID 10 logical drive with up to eight physical disks. Using both
channels, you can group up to 12 to 16 physical disks in a RAID 30 or RAID 50
logical drive, depending on whether you use the internal hot-swap mass storage
cages or an external mass storage system.
Physical Disk Roaming
The integrated HP NetRAID controller allows physical disk roaming, in which
the controller keeps track of disk modules if they are moved to different slots in
the hot-swap cages.
Multiple Adapters
The integrated HP NetRAID controller can be used with up to five additional
NetRAID Series accessory board adapters listed below. Be sure to check your
system’s PCI I/O slot availability and any slot restrictions before purchasing
another adapter.
• HP NetRAID-3Si (D5955A)
• HP NetRAID-1Si (D2140A)