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Compaq Smart Array 3200 Controller Reference Guide
Writer: Rickard Project: Compaq Smart Array 3200 Controller Reference Guide Comments: 340862-002
File Name: K-APPD.DOC Last Saved On: 12/7/98 1:37 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
SCSI Termination
All SCSI buses require termination on both ends of the bus to prevent signal
degradation. The Smart Array 3200 Controller supplies the termination on the
origination end of the SCSI bus. All internal SCSI cabling recommended for
Compaq servers provides the necessary termination for the opposite end of the
bus. Therefore, individual SCSI drives in Compaq servers should not contain
bus termination.
External SCSI devices must also provide termination for the SCSI bus. This is
supplied in Compaq external storage systems such as the ProLiant Storage
System or SCSI Storage Expander. Therefore, individual SCSI drives in
Compaq storage systems should not contain bus termination.
SCSI IDs
The Smart Array 3200 Controller contains two SCSI buses (ports), each of
which supports up to 15 drives. The internal and external connectors reside on
separate SCSI buses; peripherals attached to either connector must have a
unique SCSI ID in the ranges of 0 to 6 and 8 to 15. SCSI IDs on all peripherals
are either set manually, with switches or jumpers on the device itself, or set
automatically on Compaq products that support hot-pluggable drives. The SCSI
ID determines the device’s priority when attempting to use the SCSI bus. The
highest priority, SCSI ID 7, is reserved for use by the controller.