Actidata actiLib Autoloader 4U, User'S And Service Manual

Page: 74 / 103

actiLib Library 4U
– User and Service Guide
Page 74 of 103
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 Library after
changing the SCSI ID.

Reboot the host server. Tape Library Performance The
Library is not efficiently backing up data.

Make sure the Library 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 Library 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 Library.

Do not connect the Library 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.