When the BER file is full, the next BER to arrive overwrites the oldest BER (or
BERs) in the BER file. No count is kept of such overwrites. The BER file may
store several hundred BERs.
BER Storage when the Disk is not Operational: When the disk is not opera-
tional, the MOSS keeps the BERs in a buffer in the MOSS RAM. This buffer is
preserved during MOSS IML (see Chapter 7). When the buffer is full, new BERs
are lost, but a count of lost BERs is kept in a byte of the buffer. This is called the
lost record count.
When the disk becomes operational again, MOSS stores the buffer in the BER file
on disk, together with a BER giving the number of lost BERs in the event/error
description line.
BER File Erasure: The entire BER file can be erased by using the
DUMP/DPLY/DEL utility program. The BER file should not be erased, except in
exceptional cases, since:
It is not possible to erase individual BERs in the file, but only the entire BER
file.
The service personnel may need old BERs for history purposes.
The BER file, when full, writes the most recent BERs on the disk space used
by the oldest BERs (wraparound file). When the BER file is erased, a BER is
logged to that effect in the file. For more details, see
Service Functions,
SY33-2069.
BER Display
Normally, you may access the BER file on the MOSS disk using the 'ELD Function'
from the console. For more details on 'How to', see
Service Functions.
The ELD detail display screen gives you the main information (also called 'fields')
on the event represented by the BER.
Some of the fields may not appear on the ELD detail display, but they are part of
the BER and they are listed as they appear in the BER file. See the section 'BER
Formats on Disk' page 11-112. For more details, refer to
Service Functions
manual.
11-8
IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference
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