HP Single Channel Ultra320 SCSI G2 Host Bus Adapter - Manual (Page 11)

Introduction
Multiple Adapter Installation
The following considerations apply when you install more than one
Single Channel Ultra320 SCSI HBA G2:
•
Each adapter has one independent SCSI channel that supports up to 15 devices.
•
Each SCSI channel has its own set of unique SCSI IDs (from 6 to 0, 15 to 8). Each
peripheral on a bus must be assigned its own unique ID.
SCSI Termination
All SCSI buses require termination on both ends of the bus to prevent signal degradation. The
Single Channel Ultra320 SCSI HBA G2 supplies the termination on the adapter end of the
SCSI bus. Hot-plug drives do not require terminators on the ribbon cable because terminators
are included on the drive backplane. Nonhot-plug internal drives require terminators on the
ribbon cable. Individual SCSI devices in HP servers should not contain bus termination.
Ultra320, Ultra2, and Ultra SCCI require multimode or LVD-only terminators (rather than
SE-only terminators used with Wide Ultra SCSI-3, Fast Wide SCSI-2, and Fast SCSI-2).
External SCSI buses must also be terminated. This termination is supplied in HP external
storage systems. Individual SCSI devices in HP storage systems should not contain bus
termination.
CAUTION: To prevent boot error messages, the integrated SCSI controller on the system
board of the server must be terminated at all times. If a Single Channel Ultra320 SCSI HBA
G2 is replacing the integrated controller, a terminated SCSI ribbon cable connected to the
system board should be left, even if there are no SCSI devices attached to this cable.
1-4 HP Single Channel Ultra320 SCSI Host Bus Adapter G2 User Guide