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6-6
Troubleshooting and Diagnostic
62-0162-01
Why the Use Cleaning Tape LED Gets
Turned ON
The
Use Cleaning Tape
LED will be turned on whenever the
drive has determined that low level error performance has
degraded to a point where drive head cleaning is absolutely
required. It does this by counting the number of C3 (soft)
errors as well as the RAW (Read After Write) errors over a
number of Mbytes. When a predetermined error rate
threshold is reached, the drive displays the warning. Some
drives display the warning after a specified number of hours
of tape motion have been logged. When a tape is loaded, it
may take several minutes for the indication to come on
because the drive will wait for a specific number of bytes to be
written. A hard (non-recoverable) error will cause the
warning to be displayed immediately.
The most common reasons that the
Use Cleaning Tape
LED
gets turned on for, in order of highest rate of occurrence, are
listed below:
•
Dirty ("Stained") heads.
A cleaning cycle must be executed to clear this indication.
•
Worn tape.
DLT tapes are rated at 500,000 passes. Applications that
overwrite small blocks of data cause "shoe shining" of the
tape against the head and will reach the 500,000 passes
sooner than might be expected.
•
Bad environment.
Data errors result from a number of factors, each of which
subtract from the margin between good data recovery
and an error. Electrical or magnetic interference can
decrease this margin. High levels of dust contamination,
high humidity, and heat can also be significant factors.
Placing a CRT monitor on top of, or directly next to, a
4000/7000DLT Series should always be avoided.
•
Worn heads.
The tape heads will eventually wear out causing the time
between cleanings to get shorter and shorter. Tape head
failure is usually predicted at about 12% of the MTBF
rating (10,000 hours).
•
Defective drive.
Drive amplifier settings could be off, causing error rate
degradation. The drive could simply have failed.
Summary of Contents for 4000 Enhanced
Page 1: ...The 4000 7000DLT Tabletop Series Installation and Operation Guide...
Page 8: ...viii Figures 62 0162 01...
Page 10: ...x Tables 62 0162 01...
Page 12: ...1 2 Introduction 62 0162 01...
Page 16: ...2 2 Description 62 0162 01...
Page 19: ...Description 2 5 Figure 2 1 7000DLT Front Panel...
Page 20: ...2 6 Description 62 0162 01 Figure 2 2 4000DLT Front Panel...
Page 26: ...2 12 Description 62 0162 01...
Page 27: ...3 Safety Safety Conventions 3 3 Precautions 3 4...
Page 28: ...3 2 Safety 62 0162 01...
Page 32: ...3 6 Safety 62 0162 01...
Page 34: ...4 2 Installation 62 0162 01...
Page 40: ...4 8 Installation 62 0162 01...
Page 42: ...5 2 Operation and Maintenance 62 0162 01...
Page 60: ...6 2 Troubleshooting and Diagnostic 62 0162 01...
Page 66: ...6 8 Troubleshooting and Diagnostic 62 0162 01...
Page 67: ...A Specification General Specification A 3...
Page 68: ...A 2 Specification 62 0162 01...
Page 72: ...B 2 Drive Configuration 62 0162 01...
Page 78: ...B 8 Drive Configuration 62 0162 01...
Page 80: ...C 2 Regulatory Notices 62 0162 01...
Page 88: ...in 10 Index 62 0162 01...