IBM System/370 145 Manual page 214

logout provided by the DOS CCH rout~ne is handled by a set of completely
new CCH ERP routines. The DOS CCH ERP's are an addition to the current
set of
DOS
ERp·s. The latter are used without modification.
When a channel or
an
I/O device error occurs on a Model 145, the
appropriate ERP is scheduled to perform recovery procedures. If the
error is corrected, operations continue normally. If the error cannot
be
corrected (it is permanent), error recording occurs. If a user-
written permanent error handling routine is not present, the affected
task is abnormally terminated. The operator is notified of permanent
I/O errors.
RECOVERY MANAGEMENT SUPPORT RECORDER (RMSR) FOR DOS VERSION 4
The recovery management support recorder (RMSR), new in DOS Version 4,
is a generalized error recording routine that. replaces the error
recording functions provided in DOS version 3. RMSR provides more
comprehensive error recording than the recording routines in DOS Version
3 and writes records in SYSREC that are compatible in format with those
written in the OS error recording data set SYS1.LOGREC. This enables a
SYSREC file created by DOS Version 4 and a SYS1.LOGREC file created
by
OS MFT or MVT to be processed by the same Model 145 diagnostic routines.
This capability was not previously available since a SYSREC file created
by DOS Version 3 recording routines is not compatible in format with
SYS 1 • LOGREC.
RMSR is given control to record the following types of error records:
• Records created by MCAR and CCH for permanent and intermittent
machine and channel errors
• unit check records that RMSR creates to provide statistics about
permanent I/O device errors. This type of data is recorded by the
OBR routine in DOS Version 3.
• Counter overflow records that contain statistics about the number of
retries performed in correcting temporary I/O device errors. SDR
handles this recording in DOS Version 3.
• Tape error statistics records that the TEBV routine records in DOS
Version 3. The functions provided by the TEBV and EVA routines are
handled by the tape error statistics portion of RMSR,.
• IPL records that indicate the reason for this IPL and EOD records
that are written when the operator issues the ROD command
• Miscellaneous data recordings for errors specific to a device, such
as 3211 printer buffer errors and 3330-series disk storage buffer
errors
ENVIRONMENT RECORDING, EDIT, AND PRINT PROGRAM (EREP) FOR DOS VERSIONS 3
AND 4
The EREP routine of DOS Version 3 is a special purpose utility that
can
be
initiated as a job step via job control statements in the input
stream or by an operator command entered via the console. Its function
is to edit and print all error records contained in the SYSREC recorder
file. EREP handles all status records written by DOS Version 3 Model
145 recovery routines and is included in all DOS Version 3 operating
systems generated for the Model 145. Three versions are provided. One
to print only System/370 records, one to print only System/360 records,
and one to print both System/370 and System/360 records.
204
A Guide to the IBM System/370 Model 145