Each operating system writes error and operational records to its error-recording data set (ERDS). The records are created for the hardware (processors and devices) that makes up the environment, although the operating system also creates some records to document its own processing.
The ERDS is different for each operating system.
| OP. SYSTEM | ERDS DESCRIPTION |
|---|---|
| MVS | The system data set ERDS resides on the system
residence volume. The default name of the ERDS is SYS1.LOGREC. In
MVS releases 5.1 and later, the name can be modified at installation.
For MVS/XA* or MVS/ESA*, LOGREC can be another cataloged data set
and does not need to be on the system residence volume. The data
set is initialized by the IFCDIP00 service aid during system generation
and can be reinitialized at IPL.  This dataset is
not EAS eligible on EAV devices. |
| VM | The error-recording area is assigned on the system residence volume and initialized during system generation. |
| VSE | The system logical unit SYSREC (file name IJSYSRC) resides on the SYSRES disk. The data set is initialized by the IPL command SET RF=CREATE. |