IBM SAN512B-6, Installation, Service And User Manual

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Using the wwnrecover utility
The
wwnrecover
utility permits a recovery of WWN card data in the event of
corruption. Recovery is not possible if hardware issues prevent access to either
WWN card or if the primary and backup copy of the license ID on either card is
corrupted.
Identical data must be maintained on each WWN card at all times so that if one
card fails, the system can use the other card to provide valid system operation. To
maintain data and ensure its integrity, the system audits both WWN cards one
hour after the first system boot-up, every 24 hours after boot-up, and any time a
WWN card is inserted to compare the critical data.
If a data mismatch is detected during the audit, messages in the RASlog will
provide a summary of all errors detected and prompt you through a data recovery
process. The data recovery mechanism may vary depending on the error
encountered and the data being compared. Problems such as a mismatch between
license IDs cannot be fixed with
wwnrecover , and the output will direct you to call
Technical Support. For other problems, running wwnrecover can pinpoint the
problem and, in some cases, permit you to fix it. Mismatched data can be resolved,
and corrupt data can sometimes be recovered.
The following table lists RASlog messages that can occur during the WWN card
audit routine.
Table 20. RASlog messages from WWN card audit
Error message Issue
[EM-1220]...M1, ERROR ... A problem was
found on one or both CID cards (x), please
run the wwnrecover tool to get more
information and recovery options. Some kind of error or mismatch has been
detected in the WWN card audit.
[EM-1221], ... M1, INFO, ... A WWN card has
been inserted, a WWN verification audit will
be run to detect any mismatches or other
problems. A second WWN card is enabled and the
WWN card audit will be run. If an error is
detected during the audit, EM-1220 and
EM-1222 messages are generated.
[HIL-1650], CHASSIS, ERROR...Unable to
detect WWN card in chassis. Access to
WWN halted... WWN card has been removed from the
device. Replace as soon as possible since
system is in degraded state.
[EM-1222], ... M1, WARNING, ... A WWN
card access problem has been encountered,
please run the wwnrecover tool to get more
information and recovery options. An error is detected during normal access to
the WWN cards; typically, one of the cards
is corrupted or inaccessible.
Recovery is not possible. Please contact
Technical Support for replacement of the
corrupted or inaccessible WWN(s). The license ID on the two WWN cards do
not match.
The
wwnrecover
utility must be used to maintain data integrity when replacing one
or both WWN cards using instructions in the WWN card removal and replacement
section. To run
wwnrecover
, log in as admin and enter the following command:
switch:admin# wwnrecover
For more information on
wwnrecover
and command syntax, refer to the Fabric OS
Command Reference.
Chapter 10. WWN Cards
151