HP 5300 User Manual
Page 145
Questions and Answers
H-2
HP Smart Array 5300 Controller User Guide
HP CONFIDENTIAL
Writer: Jennifer Hayward File Name: r-apph questions and answers
Codename: SilverHammer Part Number: 135606-005 Last Saved On: 10/8/02 11:27 AM
Q: I installed the hard drives in my server. Must I now terminate each drive?
A: No. If you installed hard drives in a server with a Smart Array controller, the I/O
board and the hot-plug backplane in the server meet all termination requirements.
Individual hot-pluggable drives should already have termination removed.
Q: What is the data transfer rate for Wide Ultra3 SCSI?
A: Wide Ultra3 SCSI has a data bandwidth of 160 MB per second. Most server
applications do not generally take advantage of the full Ultra3 bandwidth, so
performance results will vary from customer to customer.
Q: What is the difference between LVD and Ultra3 SCSI?
A: Low Voltage Differential (LVD) is a signaling level for SCSI protocols. Ultra3
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 a StorageWorks Enclosure
4300. What SCSI IDs do I assign for these drives?
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.
If you are using non-hot-pluggable drives in a ProLiant server, you must set the SCSI
ID jumpers manually. Each hard drive must have a unique SCSI ID for each
controller port.
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.