Error reporting and recovery
249
Mainframe Features and Support
EREP uses the information in these records to produce many types of
reports. There are three System Exception Reports applicable to disk
media errors with the Symmetrix system. These reports are listed
below in the order you use them to identify and handle a media error
situation:
◆ System error summary (Part 2) — This report lists permanent I/O
errors (data or equipment checks) and identifies each error by job
name and time.
◆ Subsystem exception DASD — This report lists accumulated
permanent and temporary I/O errors.
◆ DASD data transfer summary — This report presents details on
data checks.
Note: Refer to the IBM EREP User's Guide and Reference for information on
how to define report requests to meet your needs.
Error handling
As part of your routine maintenance procedure, you should generate
System Exception Reports daily. From these reports, you can
determine whether errors are permanent or temporary, the number of
errors that have occurred, and their frequency.
If your system reports permanent errors occurring on the Symmetrix
system, save the Subsystem Exception DASD report output and
contact your EMC Customer Engineer.
If your system reports that temporary data check errors are occurring
on the Symmetrix system, and you consider the number of temporary
errors for a volume to be excessive, notify your EMC Customer
Engineer.
Table 32 on page 249 describes the error handling process you should
follow for the Symmetrix system.
Table 32 Error handling steps
Step Task Tools Actions
1 Detect error occurrence System Error Summary (Part 2) report
(permanent errors)
Subsystem Exception DASD report
(temporary errors)
If permanent error, or if temporary error
requires investigation, perform step 2.
2 Determine source of
errors using EREP
Subsystem Exception DASD report If the source is hardware, call the EMC
Customer Engineer.
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