HP Cisco MDS 9120 Cisco MDS 9000 Family Fabric Manager Configuration Guide, Re - Page 326

Maintaining Supervisor Modules Chapter 15 Software Images Send documentation comments to [email protected] Replacing Supervisor Modules To avoid packet loss when removing a supervisor module from a Cisco MDS 9500 Series Director, take the supervisor modules out of service before removing the supervisor module. Note You must remove and reinsert or replace the supervisor module to bring it into service. Standby Supervisor Module Boot Variable Version If the standby supervisor module boot variable images are not the same version as those running on the active supervisor module, the software forces the standby supervisor module to run the same version as the active supervisor module. If you specifically set the boot variables of the standby supervisor module to a different version and reboot the standby supervisor module, the standby supervisor module will only load the specified boot variable if the same version is also running on the active supervisor module. At this point, the standby supervisor module is not running the images set in the boot variables. Standby Supervisor Module Bootflash Memory When updating software images on the standby supervisor module, verify that there is enough space available for the image . It is a good practice to remove older versions of Cisco MDS SAN-OS images and kickstart images. To verify the space on the standby supervisor using Device Manager, follow these steps: Step 1 Step 2 Click Admin > Flash Files. Select the standby supervisor from the Partition drop-down list. At the bottom of the Flash Files dialog box, you see the space used and free space. Standby Supervisor Module Boot Alert If a standby supervisor module fails to boot, the active supervisor module detects that condition and generates a Call Home event and a system message and reboots the standby supervisor module approximately 3 to 6 minutes after the standby supervisor module moves to the loader> prompt. The following system message is issued: %DAEMON-2-SYSTEM_MSG:Standby supervisor failed to boot up. This error message is also generated if one of the following situations apply: • You remain at the loader> prompt for an extended period of time. • You do not set the boot variables appropriately. 15-14 Cisco MDS 9000 Family CLI Configuration Guide OL-16184-01, Cisco MDS SAN-OS Release 3.x