IBM Multiprise 3000, Reference Manual, Page: 205 / 264

Sense Byte 24–Logging and Message Control
The definitions in byte 24 are:
Bits 4 and 5–Logging Action: These bits show the error recovery procedure
(ERP) how to log this error. The definitions of these bits are:
The logging action is to be performed in addition to any other program action that is
specified. These bits are the only means to request sense data logging. A
program is not required to interpret other sense data to determine if logging is
required, but may interpret other bits to determine the format of the data to be
logged.
When bits 4–5 are ‘01’, the sense data is always logged.
When bits 4–5 are ‘10’, the sense data is logged once within a retry sequence on a
path whether or not the retry action is successful.
When bits 4–5 are ‘11’, the sense data is logged only if the error condition persists
through all retry actions on a path.
Bits 6 and 7–Operator Message Control: Bits 6 and 7 define the handling of an
operator message. Byte 28 contains a message code that, in combination with the
exception class in byte 22, identifies a unique message to be sent.
The definition of the bits are:
The message action is to be performed in addition to any other program action that
is specified in the sense. These bits are the only means to request a specific
Table 6-4. Byte 24 – 32-Byte Sense
Bits Definition
0–3 Reserved
4–5 Logging action
6–7 Operator message control
Table 6-5. Byte 24 Bits 4 and 5 Values
Value Definition
00 Do not log
01 Log (unconditional)
10 Log only once
11 Log only if persistent on this path
Table 6-6. Byte 24 Bits 6 and 7 Values
Value Definition
00 Send no message to the operator
01 Send a message to the operator (unconditional)
10 Send a message to the operator once
11 Send a message to the operator only if the error persists on this path
Chapter 6. ECKD 32-Byte Sense Data
6-7