C_scsi.doc 155 Tue Jul 2 14:56:06 1996
155
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:
• Single-ended SCSI bus
• Fast, Wide SCSI bus
Single-ended SCSI Bus Configuration Constraints
For the SE 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 22 shows
configuration constraints for each SE SCSI device type. If the system has an
internal CD-ROM drive or DDS tape drive, you must count them as SE
SCSI devices.
Table 22 SE SCSI Bus Configuration Constraints
SE 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 SE SCSI Devices 7
NOTICE: Magneto-Optical Autochangers use three SE SCSI drive address. Each address
must be accounted for in the maximum number of SE SCSI devices allowed.
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