FINAL TRIM SIZE : 7.0 in x 8.5 in
5
Caution Indicator
The DDS drive continually monitors the n
umb er of errors it has to correct
when reading or writing a tape. This information is presen
ted to the user
through the Caution Indicator (see ab o
vechart).
A caution indication has t
wo common meanings:
The tap e heads need cleaning.
The tap e itself is approac
hing the end of its useful life.
Maximum Usage of DDS Cassettes
Under optimal environmental conditions (50% relativehumidity,22

C),
Hewlett-Packard DDS cassettes are currently specied to 2000 passes over
any part of the tap e. In operational terms, this can b e translated in
to
approximately 200 to 300 backup operations. This takes into account that,
during a backup, an area of tape mayhave several passes because streaming
cannot be maintained, or b ecause the backup software requires that certain
areas of the tap e are accessed frequently.
Under certain conditions, the recommended numb er of backup op erations needs
to b e reduced. These conditions are as follows:
Sustained use at lowhumidity.
Use in a low-p erformance workstation, requiring an increased number of
passes.
Backup software requiring certain areas of the tap e being accessed frequen
tly.
As a guideline, HP recommends that the numb er of backup op erations should
be limited to 100 per cassette in extreme cases of the ab o
ve conditions.
In Case of Difficulty
If you experience any problems with the op eration of the new drive, contact
your HP service representative for assistance.
DRAFT
2/5/97 11:31
Configuring HP-UX for Printers and Drives 5-31
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