HP Integrity NonStop H-Series - Manual (Page 36)

Chapter Five - SCSI Bridge Electronics
Tandem 5142-xSE Rackmount Tape Subsystems User Guide 2 6
5.11.5 Setting the Error-Alert (ECC/Rewrite Percentages) Thresholds
The electronics allow you to set a numeric percentage for error-alert thresholds that, when
exceeded, cause the amber LED (the lower LED on the subsystem's front panel) to blink.
Enter error-alert thresholds by the Numeric Entry method. First, set the rewrite threshold
followed by the ECC threshold. Entries take the form
XX.X , so that you may enter values in
the range of 00.0 percent to 99.9 percent. Setting values less than 10.0 percent is
recommended. Lower values cause the amber LED to light and/or blink at a lower
percentage of error occurrences.
Note: Because the beginning of tape is written to every time a tape is unloaded, this area of the
tape tends to wear sooner than the rest of the tape media's length. As a result, it is not
unusual to experience rewrites or ECC's at the beginning of tape. If such occurs, the
predetermined thresholds may be exceeded early, but the percentage then drops below the
threshold as reading or writing moves further down the tape. To signal this, the error-alert LED
blinks when the error rates currently exceed the set values, but returns to a steady
illumination if, once exceeded, the error rate falls below the set value.
Rwr% 0.5
Ecc:80.5
PRESS to
Alter
Rwr% 0.5
Ecc:80.5
PRESS to
Incremnt
Rwr% 0.5
Ecc:80.5
PRESS to
Incremnt
Rwr%30.5
Ecc:80.5
PRESS to
Incremnt
Rwr%30.7
Ecc:80.5
PRESS to
Alter
Rwr%30.7
Ecc:20.5
PRESS to
Incremnt
Rwr%30.7
Ecc:24.5
PRESS to
Incremnt
Rwr%30.7
Ecc:24.2
PRESS to
Incremnt Rwr%30.7
Ecc:24.2
PRESS if
Done
Figure 34 Setting error-alert (ECC/Rewrite percentages) thresholds
5.12 Setup 2 Configuration Display Format Items
Enter
Set-Up 2
PRESS to
Select
Key:2.01
[288FEA]
*NOT sel
ectable*
Options:
00001401
PRESS to
Alter
BaudRate
9600 bps
PRESS to
Alter
EM: ----
NONE
*NOT sel
ectable*
Exit
Set-Up 2
PRESS to
Select
Figure 35 Setup 2 configuration items