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SCSI Connections
SCSI Restrictions
SCSI Configuration Constraints
You are limited to the number of same-type SCSI devices per system. Before
adding another SCSI device, determine if the system can support the addi-
tional device.
This workstation offers the following types of SCSI bus, each with its own
configuration constraints:
• Narrow, Single-ended SCSI bus (C160/C180/C200/C240/C360)
• Fast, Wide Differential SCSI bus (C160/C180/C200 upgrade)
• Ultra, Wide-Single-Ended SCSI bus (C200/C240/C360 only)
Narrow, Single-ended SCSI Bus Configuration Constraints
For the NSE SCSI bus, HP-UX supports only one of each type of removable
disk drive and two of the same type tape devices per system. Table 21 shows
configuration constraints for each NSE SCSI device type. If the system has
an internal CD-ROM drive or DDS tape drive, you must count them as NSE
SCSI devices.
Table 21 NSE SCSI Bus Configuration Constraints
NSE SCSI Devices
Maximum Number of Each
Type of Device Allowed
Hard Disk Drives (external only) 7
CD-ROM Drives (one internal) 1
4-mm DDS Tape Drives (one internal) 2
9-track Tape Drives 2
650-MB Magneto-Optical Drives 1
Magneto-Optical Autochangers (see notice below) 1
Maximum Number of NSE SCSI Devices 7
NOTICE: Magneto-Optical Autochangers use three NSE SCSI drive address. Each ad-
dress must be accounted for in the maximum number of NSE SCSI devices al-
lowed.