58 Diagnostics and Troubleshooting Chapter 4
SCSI ID
Changed drive SCSI ID, but
the host server does not
recognize the new ID.
■ Make sure that all SCSI devices on the same bus have unique ID
numbers.
■ If the SCSI bus is narrow (50-pin) only SCSI IDs 0 through 7 are
available.
■ Make sure that you cycle power on the autoloader after
changing the SCSI ID.
■ Reboot the host server.
Autoloader performance
The autoloader is not efficiently
backing up data.
■ Check the network bandwidth from the host computer if you are
backing up data over a network. Consider comparing to a local-
only backup.
■ Make sure that the autoloader is on its own SCSI bus and not
daisy-chained to another tape drive or to the hard drive being
backed up.
■ Clean the tape drive. See Cleaning the Tape Drive on page 36
for instructions.
■ Try a new cartridge. A marginal cartridge can cause
performance problems due to bad spots on the tape requiring
retries.
■ Make sure that the data is being compressed.
■ Check the size of the files. Small file size can impact
performance.
■ Confirm that the backup application is utilizing block sizes of at
least 32KB, preferably 64KB. Refer to the backup application
documentation for details.
Table 4 Troubleshooting Table
Problem Solution
