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SCSI Commands: 21BLOG SENSE
3.9.6 Read Error Counters Log Page (03h)
3.9.7 Sequential Access Device Log Page (0Ch)
The Read Error Counters Log Page records read errors. The parameters on this
page can be reset to zero with the LOG SELECT command.
Page Code
03h
Parameter
Description
0
Errors corrected without substantial delay
1
Errors corrected with possible delay.
2
Total rereads. (Sum of Parameter 0003 and Parameter 0006)
3
Total errors corrected. This is total read retries less total unrecoverable errors.
(Parameter 0004 minus Parameter 0006, this is also the sum of Parameter
0000 and Parameter 0001)
4
Total times error correction processed. This is the total number of read retries.
5
Total bytes processed. This is the total data sets read.
6
Total uncorrected errors. This is the total unrecoverable read errors.
The Sequential Access Device Log Page tracks the flow of data to and from the
drive. It also signals when drive cleaning is necessary.
Page Code
0Ch
Parameter
Description
0000h
Number of data bytes received from application clients during WRITE
Command operations. This is the number of bytes transferred over the SCSI
interface before compression.
0001h
Number of data bytes written to the media as a result of WRITE Command
operations, not counting ECC and formatting overhead. This is the number of
data bytes transferred to media after compression.
0002h
Number of data bytes read from the media during READ command
Operations, not counting ECC and formatting overhead. This is the number of
data bytes transferred from media with compression.
0003h
Number of data bytes transferred to the initiator(s) during READ command
operations. This is the number of bytes transferred over the SCSI interface,
after decompression.
Cleaning required. A non-zero value of the cleaning required parameter
0100h
indicates that a condition requiring cleaning has been detected and a
subsequent cleaning cycle has not been completed. The cleaning required
parameter is persistent across hard resets and power cycles.
Page Length
38h
Page Length
3Ch
Page 55
Length
4
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Length
8
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8
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