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Configuring for a Backup DDS Tape Drive
You will need to use a backup device if you have local disks connected to the
Model V743 VXI controller. This section contains instructions for con guring
an external DDS drive on HP-UX to use for backup.
Tape Selection
The DDS (\Digital Data Storage") tape drive is a sequential-access, read-write
device using removable DDS cassettes. Although DDS drives are similar
to DAT players in the audio industry, DDS and DAT cassettes are
interchangeable. There are two major di erences:
1. Audio cassette tapes transfer data in streaming mode, that is, they are
left in motion for periods of minutes. Tapes used for data are continually
starting, stopping and repositioning, which is stressful to the tape. DDS
tapes are made rugged enough to withstand this kind of treatment. Audio
tapes are not expected to perform this well, and as a result they fail very
quickly in a data environment.
2. DDS cassettes have a much tighter case-dimension speci cation than DAT
cassettes. As a result, DAT cassettes can get stuck in a DDS drive, requiring
the drive to be disassembled. For this reason, only Hewlett-Packard
supported or properly certi ed DDS tape cartridges should be used. Use of
DAT tapes intended for audio use could void your warranty.
Do not attempt to extricate a DAT cassette which is stuck
Caution
in a DDS drive. You may damage the drive. Have the drive
disassembled by someone quali ed to do so.
Configuring HP-UX for a DDS Tape Drive
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