IBM 3330 Series Reference Manual page 29

SENSE BYTE FORMAT 6 SUMMARY
FORMAT 6 - USAGE/ERROR STATISTICS
SENSE BYTES 8 thru 11 - BYTES READ/SEARCHED
These four bytes provide an accumulated count of the number of bytes processed by the storage
control in read or search operations. Bytes processed:during retry operations are not included in
this count. Only key and data field areas are accumulated.
SENSE BYTES 12 and 13 - CORRECTABLE DATA CHECKS
These two bytes provide an accumulated count of the number of ECC correctable data checks
which were detected by the storage control.
SENSE BYTES 14 and 15 - RETRY DATA CHECKS
These two bytes identify the number of ECC uncorrectable data checks which were successfully
retried by the storage control.
SENSE BYTES 16 and 17 - SEEKS
.
These two bytes provide a count of the number of access motions initiated by the channel.
SENSE BYTE 18
Bit 0 set to zero
=
bytes 20.23 contain information for interfaces A and B.
Bit 0 set to one
=
bytes 20-23 contain information for interfaces C and D.
SENSE BYTE 19 - SEEK ERRORS
Bits 0 thru 7
Identifies the total number of seek errors which were successfully retried by the storage control.
SENSE BYTE 20 - COMMAND OVERRUN A or C
Bits 0 thru 7 Provides a count of the number of command overruns which were retried by the storage control
for channel A or C.
SENSE BYTE 21- DATA OVERRUN AorC
Bits 0 thru 7
Provides a count of the number of data overruns which were retried by the storage control for
channel A or C.
SENSE BYTE 22 - COMMAND OVERRUN B or D
I
Bits 0 thru 7
Provides a count of the number of command overruns which were retried by the storage control
for channel B or D.
SENSE BYTE 23 - DATA OVERRUN B or D
Bits 0 thru 7
Provides a count of the number of data overruns which were retried by the storage control for
channel B or D.
MESSAGE TABLE - FORMATS
Sense byte 7-
bits 4 thru 7
=
0000 No message.
0001-1111 Not used.
Sense Data 27