HP A7143A RAID160 SA Controller Support Guide

Questions and Answers
RAID160 SA Controller Q & A
Appendix E 163
A:If you are using hot-pluggable drives in a StorageWorks Enclosure
4300, the SCSI IDs are set automatically according to the bay in which
the drives are installed and do not need to be set manually.
The IDs of devices on each SCSI bus do not have to be consecutive.
However, the IDs must still be unique to each device on any given SCSI
bus.
Q:Can I use third-party drives (those not manufactured by HP) with the
RAI160 SA controller?
A:No.
Q:Why do the drive activity LEDs light up on some drives when my
system is idle?
A:The RAID160 SA controller performs several different background
activities on the drives when the controller is otherwise idle. For
example, Auto-Reliability Monitoring scans fault-tolerant volumes for
defects and verifies the consistency of parity data, and Drive Parameter
Tracking periodically checks the performance of all drives on the
controller (normally on an hourly basis).
Q: What is RAID ADG?
A:RAID ADG is an extension of RAID 5 that allows additional fault
tolerance by using two different and independent parity schemes. Data is
striped across a set of hard drives, just as with RAID 5, and the two sets
of parity data are calculated and written across all the drives in the
array.
RAID ADG provides an extremely high level of fault tolerance and can
sustain two simultaneous drive failures without downtime or data loss.
This fault tolerance level is the perfect solution when data is mission
critical.