Operating instructions

7.10 SCSI Problems
SCSI problems are generally manifested as data corruption, boot
problems, or poor performance.
Check SCSI bus termination.
• Cable is properly seated at system board or option connector.
• Bus must be terminated at last device on cable or at physical cable end.
• No terminators in between.
• Old 50-pin (narrow) devices must be connected with wide-to-narrow adapter
(SN-PBXKP-BA). Do not cable from the connector on the card.
• Using 50-pin devices on the bus may significantly degrade performance.
Any external drives must be connected to their associated card, and these cards
must have no internal drives connected to them. Use a separate external
controller card.
• Ultra-wide SCSI has strict bus length requirements.
• SCSI bus itself cannot handle internal plus external cable.
• Use a separate card for external devices and terminate properly.
7-14 DS25 Owner’s Guide