WWN Card Overview

Two WWN cards are located behind the WWN bezel (logo plate) between the power supplies on the nonport side of the device. WWN 1 is located on the left side, and WWN 2 is located on the right side. The WWN cards store critical configuration data, such as WWN, IP addresses, part and serial numbers, and license IDs for the device.

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 bootup, every 24 hours after bootup, 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 wwnrecover utility permits recovery of WWN card data in the event of corruption. 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. For more information on the wwnrecover utility, see Using the wwnrecover Utility.