HP StorageWorks 4/16 HP StorageWorks DC and DC04 SAN Backbone Director Switche - Page 187

Figure 71 Blower assembly Replacing the WWN bezel (logo plate) and WWN card The World Wide Name (WWN) cards contain fully redundant circuits and normally do not require replacement. Two WWN cards are located beneath the WWN bezel (logo plate). Allow approximately 20 minutes to replace a WWN card. The following items are needed to replace a WWN card: • ESD grounding strap • #2 Phillips screwdriver (required only for some versions of the WWN card) • If a serial console session is used: serial cable and a workstation computer with a terminal emulator application (such as HyperTerminal for Windows systems or TIP for Solaris systems) How to determine whether or not to replace a WWN card Before replacing a WWN card, verify that the replacement is necessary. Any of the following events can indicate that the card requires replacement: • Status LED on WWN card (beneath the bezel) is steady amber • Problems viewing or modifying the data stored on the WWN card, see Table 37 • Error messages regarding WWN units #1 or #2, see Table 38 To determine the status of a WWN card: HP StorageWorks DC and DC04 SAN Backbone Director Switches 187