Direct access storage device-service information message (DASD-SIM) record

A SIM record is recorded on the logrec data set to show a symptom code associated with a failure. A sense record, requesting logging as an A3 record, is produced when information about maintenance requirements needs to be presented. A SIM record contains the following information:
Table 1. Format of the SIM record
Offset Size (bytes) alignment (bits) Field name Description
Dec Hex
0 (0) 1 A3KEY1 Class/Source:
    1010 0011   Service Information Message Record; type = X'A3'.
1 (1) 1 A3KEY2 System/release level:
    100. ....   OS/VS2 and later MVS™ systems.
    ...x ....   Reserved.
    .... xxxx   Release level (0-1F).
2 (2) 1 A3SMS Record-independent switches:
    1... ....   More records follow.
    0... ....   Last record.
    .1.. ....   Time-of-day (TOD) clock instruction issued.
    ..1. ....   Record truncated.
    ...1 ....   370 XA mode record.
    .... 1...   TIME macro used.
    .... .xxx   Reserved.
3 (3) 3   Record-dependent switches:
    Byte 0 A3SW1  
    0001 ....   SIM record.
    .... xxxx   Severity Code.
    .... 0000   Severity not defined.
    .... 0001   Information provided as part of PD or repair activity.
    .... 0010   Degradation or intermittent failures for nonfunctional unit.
    .... 0100   Permanent failure in nonfunctional unit.
    .... 1000   No immediate performance impact. Expected loss or degradation of function if no action taken.
    .... 1001   Degradation or intermittent failures for functional unit.
    .... 1100   Permanent failure causing loss of function.
    .... 1111   Permanent failure in functional unit which has redundant hardware.
    Byte 1 A3SW2  
    1... ....   CHPID is incorrect.
    .xxx xxxx   Reserved.
    Byte 2 A3SW3 Reserved.
6 (6) 1 A3RCDCT Record count:
    xxxx ....   Sequence number of this physical record.
    .... xxxx   Total number of physical records in this logical record.
7 (7) 1   Reserved.
8 (8) 8 A3DT System date and time of incident:
8 (8) 4 A3DATE System date of failure.
12 (C) 4 A3TIME System time of failure.
16 (10) 8 A3CPUID Central processor identification.
16 (10) 1 A3VER Machine version code:
    xxxx xxx.   Reserved.
    .... ...0   Version I central processors.
    .... ...1   Version II central processors.
17 (11) 3 A3SER Central processor serial number.
20 (14) 2 A3MOD Central processor machine model number (3033, 4341, etc.).
22 (16) 2 A3CEL Reserved.
        END OF STANDARD HEADER
24 (18) 7   Reporting unit type or 0s. Type and model of device reporting the error.
31 (1F) 7   Control unit type or 0s. Type and model of control unit of device reporting the error (included if the reporting unit is connected to a control unit).
38 (26) 1   Manufacturer identity or 0s. Identity of device manufacturer.
    0000 0001   IBM®.
39 (27) 9   Unique identifier or 0s. The manufacturing plant and serial number of the reporting device.
48 (30) 1   Length of SSI data field beginning at end of SI field. >
49 (31) 3 A3SECUA Byte 0 contains the channel path ID (CHPID) and Bytes 1 and 2 contain the reporting device number. (No retry is performed for DASD X'A3' records.)
52 (34) 1   Device type for the device associated with the error.
    Byte 0    
    1... ....   Byte 1 contains a control unit ID.
    .xxx xxxx   Reserved.
    Byte 1   Control unit ID if (Byte 0(Bit 0))=1. Otherwise system dependent data unused by EREP.
    Byte 2   Device class code.
    Byte 3   Device type code.
56 (38) 1   Length of SI data field.
57 (39) 3 A3PCUA This field contains the device number.
60 (3C) Variable   SI data. Device dependent information from control program. Bytes 0-5 include the VOLID if it is contained in the record.
Var. Var.     SSI data. Device dependent information from reporting subsystem.
Parent topic: Automatic problem reporting