Cisco MDS-9124 Troubleshooting Guide - Page 62

Troubleshooting Cisco SAN-OS Software System Reboots Chapter 2 Troubleshooting Installs, Upgrades, and Reboots Send documentation comments to [email protected] Table 2-5 Problem Power-on or Switch Reboot Hangs (continued) Possible Cause The BIOS is corrupted. The kickstart image is corrupted. Boot parameters are incorrect. The system image is corrupted. Solution Replace this module. Contact your customer support representative to return the failed module. Interrupt the boot process at the >loader prompt. Update the kickstart image. See the "Recovery from the loader> Prompt on Supervisor-2 Modules" section on page 2-19. Verify and correct the boot parameters and reboot. Interrupt the boot process at the switch#boot prompt. Update the system image. See the "Recovery from the switch(boot)# Prompt" section on page 2-21. Corrupted Bootflash Recovery All switch configurations reside in the internal bootflash. If you have a corrupted internal bootflash you could potentially lose your configuration. Be sure to save and back up your configuration files periodically. The regular switch boot goes through the following sequence (see Figure 2-2): 1. The basic input/output system (BIOS) loads the loader. 2. The loader loads the kickstart image into RAM and starts the kickstart image. 3. The kickstart image loads and starts the system image. 4. The system image reads the startup configuration file. Figure 2-2 Regular Boot Sequence Loads loader 1. BIOS Loads kickstart image 2. Loader Loads kernel, basic drivers, and system image Login prompt 3. Kickstart image 4. System image 79952 If the images on your switch are corrupted and you cannot proceed (error state), you can interrupt the switch boot sequence and recover the image by entering the BIOS configuration utility described in the following section. Access this utility only when needed to recover a corrupted internal disk. Caution The BIOS changes explained in this section are required only to recover a corrupted bootflash. 2-14 Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x OL-9285-05