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Sun Enterprise 6500/5500/4500 Systems Installation Guide

Connecting External SCSI Devices

External SCSI-2 devices connect to your system through the built-in single-ended Fast/Wide SCSI-2 port on I/O+ boards (except for the board in slot 1), or through FSBE/S, DSBE/S, SWIS/S, or DWIS/S SBus cards installed on I/O+ boards.

Note -

The onboard SCSI-2 bus on the I/O+ board in slot 1 controls internal media tray devices. Therefore, the external SCSI connector on the I/O+ board in slot 1 must always have a terminator installed.

Note -

The maximum combined length for a string of SCSI cables is 6 meters for non-differential cables. For differential SCSI cables, the maximum is 25 meters. When calculating the total length of a SCSI string, include external cables, internal cables, and printed traces. Table 2-2 lists internal measurements for the Enterprise servers.

Table 2-2 Internal SCSI Lengths

Location  

Internal Length 

Comments 

Enterprise 6500 slot 1 

3.7 meters 

Includes I/O+ board traces and cables to media tray 

Enterprise 5500 slot 1 

3.7 meters 

Includes I/O+ board traces and cables to media tray 

Enterprise 4500 slot 1 

1.4 meters 

Includes I/O+ board traces and cables to media tray 

SBus+ I/O board 

0.43 meter 

Includes board traces only 

Graphics+ I/O board 

0.43 meter 

Includes board traces only 

Disk board 

0.64 meter 

Includes board traces only 

For information on device addressing, priorities, and slot assignments, refer to Appendix D, "Rules for System Configuration in the Sun Enterprise 6500/5500/4500 Systems Reference Manual, part number 805-2632.

Caution - Caution -

Risk of equipment damage. Do not assign the same SCSI address to two devices sharing the same SCSI bus or SBus card.

To connect an external SCSI device to your system:

  1. Connect a SCSI cable to the appropriate SCSI-2 host on the I/O+ board.

    • For the I/O+ board in slot 1, use an SBus card. The onboard SCSI-2 port is reserved for the cable to the media tray.

    • For I/O+ boards in slots 2 through 15, use the onboard SCSI-2 port (Figure 2-11) or an SBus card.

    Figure 2-11 Onboard Single-ended SCSI Connector on the I/O+ Board

    Graphic

  2. For Enterprise 6500/5500 systems only: route the cable from the I/O+ board down along the left mounting rail inside the cabinet.

    Use tie wraps to secure the cable to the left mounting rail.

  3. Connect the other end of the SCSI cable to the external SCSI-2 device.

  4. For Enterprise 6500/5500 systems only: replace the rear door and kick panel.

This concludes the hardware installation for the standalone server. You can now power on the system and test the server.