Brocade Communications Systems DCX Backbone, Hardware Installation Manual, Page: 106 / 167

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. This utility is not
available in Fabric OS prior to v7.4.0.
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 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
Brocade 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 13 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 chassis. 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 Brocade 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 Brocade Fabric OS Command Reference .
Verifying the need for replacement
Before replacing a WWN card, verify that the replacement is necessary. Any of the following events can indicate that the card requires
replacement:
• Status LEDs on the WWN bezel not reflecting the actual status of the components.
• Power or Status LEDs on WWN card (beneath logo plate) indicate a problem.
• Problems viewing or modifying the data stored on the WWN card.
• Error messages regarding WWN units #1 or #2 from the chassisshow output.
• If an EM-1220 or EM-1222 error message occurs in the RASlog and WWN card recovery is not successful using
wwnrecover .
WWN card removal and replacement
Brocade DCX Backbone Hardware Installation Guide
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