IBM Storage Networking SAN256B-7 Installation, Service And User Manual page 172

• Electrostatic discharge (ESD) grounding strap
• No. 1 Phillips screwdriver
• Workstation computer
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 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 32. RASlog Messages from WWN Card Audit
Error Message
[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.
[EM-1221], ... M1, INFO, ... A WWN
card has been inserted, a WWN
verification audit will be run to
detect any mismatches or other
problems.
[HIL-1650], CHASSIS, ERROR...Unable to
detect WWN cards in chassis. Access to
WWN halted...
[EM-1222], ... M1, WARNING, ... A WWN
card access problem has been
encountered, please run the wwnrecover
tool to get more information and
recovery options.
Recovery is not possible. Please
contact Brocade Technical Support for
replacement of the corrupted or
inaccessible WWN(s).
148 IBM Storage Networking SAN256B-7: SAN256B-7 Installation, Service, and User Guide
Issue
Some kind of error or mismatch has been detected
in the WWN card audit.
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.
The WWN card has been removed from the device.
Replace the card as soon as possible since the
system is in a degraded state.
An error is detected during normal access to the
WWN cards; typically, one of the cards is corrupted
or inaccessible.
The license ID on the two WWN cards does not
match.