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Chapter 4. Configuring the Library
50
SCSI Initiator
Set the SCSI Initiator mode from the second configuration screen; to get there from the
main screen, press Config > More.
Unless specifically recommended by the backup software vendor, leave the SCSI
Initiator on. When the SCSI Initiator is on, the library communicates with the drives via
the SCSI bus. The library queries the drives before and after tape loads and unloads,
and it returns the status of the drive to the host. When SCSI Initiator is off, the host
system is responsible for determining the status of the drives.
• Touch the + and - symbols to toggle the SCSI Initiator on and off.
• Touch Save Parms > No, because it is not necessary to restart the library for these
changes to take effect.
SCSI Bus Mode
Set the bus mode (most often left at the default of 0) from the second configuration
screen; to get there from the main screen, press Config > More. This setting determines
the maximum data transfer rate.
The following table indicates the maximum SCSI bus transfer rate for specified SCSI
Bus Mode settings. The SCSI Bus Mode setting of 0 is the default.
Note: Some HBAs do not function properly with Ultra SCSI transfer rates
(40 MB/sec, AIT-2 libraries only). Libraries with AIT-2 tape drives
are shipped from the factory with the SCSI Bus Mode set to 0.
If your system experiences problems with the higher transfer rate,
you can experiment setting it to SCSI Bus Mode 1 to force fast
wide transfers.
To change the SCSI bus mode, set the configuration option in the third Configuration
screen. Be sure to save the parameters and restart the library.
SCSI Bus Mode AIT-2 Setting AIT-3 Setting
0 40 MB/sec 80 MB/sec
1 20 MB/sec 40 MB/sec
2 16.1 MB/sec 32.2 MB/sec
3 13.2 MB/sec 26.4 MB/sec
4 11.4 MB/sec 22.8 MB/sec
5 10 MB/sec 20 MB/sec