Log Sense
96122 • Revision: F Chapter 6 SCSI Commands 99
Log Sense
The Log Sense command (4Dh) enables the library to report its error logs and
statistics to the initiator.
TABLE 6-14 Log Sense Command
Byte
Bit
76543210
0Operation Code (4Dh)
1 Ignored Reserved (0) PPC (0) SP (0)
2PC Page Code
3 Reserved (00h)
4 Reserved (00h)
5
to
6
(MSB)
Parameter Pointer
(LSB)
7
to
8
(MSB)
Allocation Length
(LSB)
9 Control Byte (00h)
Log Sense Command Definitions:
PPC Parameter Pointer Control is not supported (0).
SP Save Parameters feature is not supported (0).
PC The library accepts values of 0 or 1 in the Page Control field.
Page Code
■ 00h = List Supported pages
■ 07h = List Last n Error Events page
■ 2Eh = Informational Exceptions TapeAlert page (0 or 1 in the PC field)
Parameter Pointer The Parameter Pointer allows an initiator to request data starting at a specific
parameter code. This value is set to 00h for page code 0h.
Allocation Length Specifies the number of bytes the initiator has allocated for data returned from
the Log Sense command.
A value of 0 is considered an error.
The maximum data length for the log sense data that the library can return
is 3C4h bytes.
The length varies based on the Page Code selected.
■ 00h = List Supported pages; length is 7h
■ 07h = List Last n Error Events page; length is 3C4h
■ 2Eh = Informational Exceptions TapeAlert page; length is 144h
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