Troubleshooting

Troubleshooting Devices and Media

If you receive media related errors during write operations, or if the medium is marked as poor, you can check the media.log file for media errors statistics. You can do this also when receiving media related errors during read operations.

Media.log file contains the following error statistics:

Error statistics

Explanation

 

 

errsubdel=n

errors corrected with substantial delays

 

 

errposdel=n

errors corrected with possible delays

 

 

total=n

total number of re-writes

 

 

toterrcorr=n

total number of errors corrected and

 

recovered while writing

 

 

totcorralgproc=n

total number of times correction

 

algorithm processed

 

 

totb=n

total bytes processed (write)

 

 

totuncorrerr=n

total number of uncorrected errors (write)

 

 

 

where n stands for number of errors.

 

If a parameter has the value -1, it means that the device does not

 

support this statistic parameter. If all parameters have the value -1, it

 

can either mean that during processing the tape quality statistics an

 

error occurred or the device does not support medium quality statistics

 

at all.

 

Although the tape statistical results are reported in bytes for total

 

bytes processed, this is not true for all devices. LTO and DDS devices

 

report data sets and groups, respectively, and not bytes.

Examples

Here are a few examples from the media.log file:

 

• Log sense write report for DLT/SDLT devices - total bytes processed.

 

Media ID from tape= 0fa003bd:3e00dbb4:2310:0001; Medium Label=

 

DLT10; Logical drive= dlt1; Errors corrected no delay= 0; Errors

 

corrected delay= 0; Total= 13639; Total errors corrected= 13639;

 

Total correction algorithm processed= 0; Total bytes processed=

 

46774780560; Total uncorrected errors= 0

 

46774780560 bytes of native data after compression were processed

 

(a full DLT8000 tape).

576

Chapter 12

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Image 606
HP B6960-90078 manual 576, Error statistics Explanation