IBM SAN512B-6, Installation, Service And User Manual

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Chapter 10. WWN Cards
This chapter provides the following information:
v “WWN card overview”
v “Precautions specific to WWN cards” on page 148
v “WWN card fault indicators” on page 148
v “WWN card replacement task guide” on page 150
v “Time and items required for replacement” on page 150
v “Using the wwnrecover utility” on page 151
v “Preparing for WWN card replacement” on page 152
v
“Hot-swap replacement” on page 153
v “Cold-swap replacement” on page 154
v “Removing the WWN card and bezel” on page 156
v “Configuring airflow direction on WWN cards” on page 157
v “Verifying WWN card operation” on page 159
WWN card overview
Two WWN cards are located behind the WWN bezel between the power supplies
on the nonport side of the device. WWN 1 is located on the left side and WWN 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 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
wwnrecover utility permits a 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
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, refer to “Using the wwnrecover utility” on page 151.
Note: The device will operate with one WWN card, but will be in degraded
condition. If you have removed a card, be sure to replace as soon as possible.
WWN card location and numbering
WWN card are located behind the WWN bezel on the nonport side of the device
between the power supplies. The bezel must be removed to access the card trays.
The following figure illustrates WWN card location and numbering.
© Copyright IBM Corp. 2017
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