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 standard 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.
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. |
| | | | |
| | | | |
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.