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Optimizing performance
Various factors can affect autoloader performance, particularly in a network environment or if
the drive is not on a dedicated SCSI bus.
If your autoloader is not performing as well as expected, consider the following points before
contacting HP Support at
www.hp.com/support.
• Is the autoloader connected to a suitably-rated built-in SCSI bus or HBA, see “Why is the
SCSI bus type important?” on page 3. Suitably-rated means an Ultra Wide or higher SCSI
specification, such as an Ultra 160 SCSI Host Bus Adapter.
• Is the autoloader on a dedicated SCSI bus? For optimum performance, we recommend that
the autoloader is the only device on the SCSI bus. If it is not, ensure other devices are the
same SCSI specification as your autoloader model. If they are single-ended, the bus will
switch to single-ended mode with a lower transfer speed.
• Do not put autoloaders and hard disks on the same SCSI bus.
• Is the SCSI bus terminated correctly. The last device on the SCSI bus must be terminated.
• Have you installed the correct device drivers for your operating system and backup
application? See “Backup software and drivers” on page 5.
• Are you backing up across a network? The network load may be affecting the speed of
transfer or your backup application may only be appropriate for a single-server
environment.
• Is the backup application writing buffers at the correct speed? You may need to tune the
transfer, buffer and block size settings to optimize the speed that the application writes data
to the autoloader. HP StorageWorks DAT autoloaders have an internal buffer of 8 MB.
autoload_master-frame6.fm Page 38 Monday, December 29, 2003 9:39 AM