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. . 1 . . . . 3 . . . . . . . . . . . . 1 . . . 2 . . . . . . . . . . . . . 1 . . 1 . . . . . . . . . . . . . . 1 . 0 . . . . . . . . . . . . . . . 1 15 1 . . . . . . . . . . . . . . . 14 . 1 . . . . . . . . . . . . . . 13 . . 1 . . . . . . . . . . . . . 12 . . . 1 . . . . . . . . . . . . 11 . . . . 1 . . . . . . . . . . . 10 . . . . . 1 . . . . . . . . . . 9 . . . . . . 1 . . . . . . . . . 8 . . . . . . . 1 . . . . . . . . 15 . . . . . . 8 7 . . . . . . 0 SCSI–3 Fast, Wide Bus SCSI Restrictions This section describes the SCSI restrictions that apply to your workstation in the following areas: • Cables • Connectors and terminator • SCSI configuration constraints Cables All SCSI devices ship without cables. Only SCSI cables approved by HP can be used to connect your workstation and any SCSI devices. HP offers the following SCSI cables for single-ended standard SCSI devices: • K2296 cable with 0.9 meter (3 feet) length • K2297 cable with 1.5 meter (5 feet) length HP offers the following SCSI cables for connecting externally connected devices to the system fast, wide port: • C2911A cable with 0.9 meter (3 feet) length • C2924A cable with 2.5 meter (8.2 feet) length • C2925A cable with 10.0 meter (32.8 feet) length • C2926A cable with 20.0 meter (65.6 feet) length CAUTION: SCSI cables approved by HP are designed to function within the SCSI tolerances for HP devices. Use of other cables can result in significant problems with system operation. Singled-ended SCSI-2 definition limits the total cable length of SCSI-2 cables to 6 meters (19.6 feet). Fast, wide SCSI-3 definition limits the total cable length of SCSI-3 cables to 25 meters (82 feet). Always use the shortest possible cable(s) for your configuration. If you are daisy-chaining single-ended standard SCSI-2 devices together, use the following cables: • 92222A cable with 0.5 meter (1.6 feet) length • 92222B cable with 1.0 meter (3.2 feet) length • 92222C cable with 2.0 meter (6.6 feet) length If you are daisy-chaining fast, wide SCSI-3 devices together, use the following cable: • C2911A cable with 0.9 meter (3 feet) length • C2924A cable with 2.5 meter (8.2 feet) length • C2925A cable with 10.0 meter (32.8 feet) length • C2926A cable with 20.0 meter (65.6 feet) length NOTICE: See “Determining SCSI Bus Length” later in this Appendix to determine the total length of your cables. Connectors and Terminator Any single-ended standard SCSI-2 device connecting to the system board must use a 50-pin high-density thumb screw connector on the end connecting to the system board, and a 50-pin low-density bail lock connector on the other end. If you attach a second SCSI-2 device, the cable must have low-density connectors on each end. Any fast, wide SCSI-3 device connecting to the system board must use a 68-pin high-density thumb screw connector on both ends. The last device connected to the SCSI bus must be terminated with a SCSI terminator. All of the devices listed ship without terminators. If you do not already have a SCSI terminator, you must order terminator K2291 (for 50-pin connectors) or C2905A (for 68-pin connectors) from Hewlett-Packard. 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 additional device. This workstation offers the following types of SCSI bus, each with its own configuration constraints: • single-ended standard SCSI-2 bus • fast-wide, SCSI-3 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 system. Table C–3 shows configuration constraints for each single-ended standard SCSI-2 device type. If the system has internal hard disk drives or a floppy disk drive, you must count them as SCSI-2 devices. Table C–3. Single-Ended SCSI-2 Bus Configuration Constraints Single-Ended SCSI-2 Devices Maximum Number of Each Type of Device Allowed Hard Disk Drives (internal and external) Floppy Disk Drives CD-ROM Drives 4-mm DDS Tape Drives (one internal) 9-track Tape Drives 650-MB Magneto-Optical Drives Magneto-Optical Autochangers (see notice below) 7 1 1 2 2 1 1 Maximum Number of SCSI-2 Devices 7 NOTICE: Magneto-Optical Autochangers use three SCSI-2 drive addresses. 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 SCSI-3 Bus Configuration Constraints Fast, wide SCSI-3 does not work with the single-ended standard SCSI-2. Table C–4 shows the configuration constraints for each fast, wide SCSI-3 device type. Table C–4. Fast, Wide SCSI-3 Bus Configuration Constraints External Fast, Wide SCSI-3 Devices Maximum Number of Each Type of Device Allowed SCSI-3 Drive (fast, wide disk drives only) SCSI-3 Disk Arrays (addressed as single drive) 15 7 Determining SCSI Bus Length CAUTION: Do...
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