System ending (EOD) record

An EOD record is recorded on the logrec data set when either of the following occur:

The system operator enters the HALT EOD command to end the system. The system operator usually enters the HALT EOD command before one of the following conditions:
- When the power is turned off.
- When the system is going to enter a long wait state.
An abnormal end occurs because of a serious error that requires operator intervention (such as hot I/O).

For a normal end, the record consists of the 24-byte header. For an abnormal end, the header is followed by fields containing data related to the error.

Table 1. Format of the EOD record
Offset		Size (bytes) alignment (bits)	Field name	Description
Dec	Hex	Size (bytes) alignment (bits)	Field name	Description
0	(0)	1	CLASRC	Class/Source:
		1... ....		EOD record; type=X'80'.
		1... ...1		System end (non-restartable); type=X'81'.
		1... .1..		EOD from IOS (restartable wait state); type=X'84'.
1	(1)	1	OPSYS	System/Release level:
		100. ....		OS/VS2.
		bits 3-7
		0-1F		Release level 0-31.
2	(2)	4	SW1	Record switches:
		Byte 0
		1... ....		More records follow.
		0... ....		Last record.
		.1.. ....		Time-of-day (TOD) clock instruction issued. Used in conjunction with date and time values at displacements 8 and 12.
		..1. ....		Record truncated. (Not used for EOD record.)
		...1 ....		Record created by MVS/SP Version 2, 3, or 4.
		.... 1...		TIME macro used.
		.... .xxx		Reserved.
		Bytes 1 and 2		Not used for EOD record.
		Byte 3		Incremental release number (alphanumeric) of operating system.
6	(6)	2		Not used for EOD record.
8	(8)	4	DATE	System date of condition.
12	(C)	4	TIME	System time of condition.
16	(10)	1	VERNO	Machine version code.
17	(11)	3	CPUSER	Central processor serial number.
20	(14)	2	CPUMODEL	Central processor machine model number.
22	(16)	2	MCELLNG	Reserved.
				END OF STANDARD HEADER
24	(18)	40		EOD extension (see note).
24	(18)	4		Length of user data plus 8.
28	(1C)	4		Wait state code.
32	(20)	32		User data.
				Note: If the wait state code is X'110', X'111' or X'112', hot I/O recovery processing writes this ending record. The 32-byte user data field contains the SCD entry for the channel with the “hot” condition. See z/OS® MVS™ Data Areas in http://www.ibm.com/systems/z/os/zos/bkserv/ for a detailed description of the SCD. For other wait state codes that use the EOD extension, the length of the data field and the extension may vary.