actiLib Autoloader 1U
– User and Service Guide
Page 74 of 97
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 loader after
changing the SCSI ID.
Reboot the host server. Tape loader Performance The
loader is not efficiently backing up data.
Make sure the loader and tape drive are on their own SCSI
bus and not daisy-chained to another tape drive or to the
hard drive being backed up.
Make sure the loader is connected to a LVDS SCSI bus
and there are no SE devices on the same bus, because
this will cause the entire bus to negotiate down to SE
speed.
Use an Ultra320 SCSI bus and high-quality cabling with
the loader.
Do not connect the loader to a narrow SCSI bus.
Bad performance
Try a new cartridge. A marginal cartridge can cause
performance problems due to bad spots on the tape
requiring retries.
Backing up data that compresses poorly or is already
compressed will lower performance.
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.
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 the backup server has enough memory to
handle the bandwidth of the backup or restore.
Clean the tape drive. See ”Cleaning the tape drive” on
page 69 for instructions.
