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SCSI Connections
SCSI Restrictions
This workstation offers the following types of SCSI bus, each with its own
configuration constraints:
• single-ended standard SCSI-2 bus
• fast, wide, differential SCSI bus
Single-Ended SCSI-2 Bus Configuration Constraints
For the single-ended standard SCSI-2 bus, HP-UX supports only one of each
type of removable disk drive and two of the same type tape devices per sys-
tem. Table 18 shows configuration constraints for each single-ended stan-
dard SCSI-2 device type. If the system has internal hard disk drives or a CD-
ROM drive, you must count them as SCSI-2 devices.
CAUTION: Do not mix single-ended standard and fast, wide SCSI-2 peripherals.
Fast, Wide Differential SCSI Bus Configuration Constraints
Fast, wide SCSI does not work with the single-ended standard SCSI-2.
Table 19 shows the configuration constraints for each fast, wide, differential
SCSI device type.
Table 18 Single-Ended SCSI-2 Bus Configuration Constraints
Single-Ended SCSI-2 Devices
Maximum Number of Each
Type of Device Allowed
Hard Disk Drives (external only) 7
CD-ROM Drives 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 SCSI-2 Devices 7
NOTICE: Magneto-Optical Autochangers use three SCSI-2 drive address. Each address
must be accounted for in the maximum number of SCSI-2 devices allowed.