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Table 26: Parallel SCSI device not detected
Problem
Solution
Device not detected
• Check that the HBA supports multiple LUNs and this feature is
enabled. If not, only the tape drive will be detected.
• Check for conflicting SCSI IDs.
• Power on the device before powering on the host computer.
• Make sure that the library does not have the drive off line and that
the library is not running a test.
• Attach the device to an LVDS SCSI host adapter/bus.
• The parallel SCSI cable length might be too long. Use a shorter
cable or remove other devices from the bus.
• Parallel SCSI bus not properly terminated. See
problems after installing a parallel SCSI drive
on page 147.
• Check that the device is fully powered up and is not in an error
state.
• Check the parallel SCSI connector and terminator for bent pins.
Detection problems after installing a parallel SCSI drive
on
page 147 for more detailed troubleshooting help.
Changed drive SCSI ID, but the
host server does not recognize the
new ID.
• Make sure that all parallel SCSI devices on the same bus have
unique SCSI ID numbers.
• Only SCSI IDs 0 through 7 are available on a narrow (50 pin) bus. If
the device is on a narrow bus and has a SCSI ID of 8 or greater, the
host server will not detect the drive. If you must use SCSI IDs 8 or
greater, use a wider bus.
• Reboot the host server.
156
Troubleshooting information and procedures