HP A7143A RAID160 SA Controller Support Guide

Questions and Answers
RAID160 SA Controller Q & A
Appendix E162
RAID160 SA Controller Q & A
Q:How many RAID160 SA controllers can I install in my system?
A:The maximum number of controllers that you can install in your
system depends on your server and several other factors specific to your
configuration. Generally, the maximum number is restricted to the
number of PCI slots not used for other peripherals.
Another limiting factor is the power rating of your system. Each
RAID160 SA controller requires 24.9 W. Your server must be capable of
supplying every controller with this amount of power.
Q:How many external drives can I install in my system?
A:Each RAID160 SA controller has four SCSI buses. Each bus can
support up to 14 drives.
Q:Does the RAID160 SA controller support SCSI tape drives and
CD-ROM drives?
A: No.
Q:What is the data transfer rate for Wide Ultra160 SCSI?
A:Wide Ultra160 SCSI has a data bandwidth of 160 MB per second. Most
server applications do not generally take advantage of the full Ultra160
bandwidth, so performance results will vary from customer to customer.
Q:What is the difference between LVD and Ultra160 SCSI?
A:Low Voltage Differential (LVD) is a signaling level for SCSI protocols.
Ultra160 is a SCSI protocol that uses LVD signaling. Ultra2 also uses
LVD signaling, but earlier SCSI protocols used Single-Ended (SE)
signaling.
Q:Are Single Ended and Low Voltage Differential SCSI compatible?
A:Yes. When mixing SE drives and LVD drives on a single SCSI channel,
all drives switch down to SE SCSI mode and operate under SE SCSI
rules. To maintain a true LVD SCSI bus with its associated performance
advantages, a LVD SCSI channel should only be connected to LVD SCSI
drives.
Q:I have several hard drives in my server and in an HP StorageWorks
Enclosure 4300. What SCSI IDs do I assign for these drives?