Cisco MDS-9124 Troubleshooting Guide - Page 63

Chapter 2 Troubleshooting Installs, Upgrades, and Reboots Troubleshooting Cisco SAN-OS Software System Reboots Send documentation comments to [email protected] Recovery procedures require the regular sequence to be interrupted. The internal switch sequence goes through four phases between the time you turn on the switch and the time the switch prompt appears on your terminal-BIOS, boot loader, kickstart, and system. (See Table 2-6 and Figure 2-3.) Table 2-6 Recovery Interruption Phase Normal Prompt1 Recovery Prompt2 Description BIOS loader> No bootable device The BIOS begins the power-on self test, memory test, and other operating system applications. While the test is in progress, press Ctrl-C to enter the BIOS configuration utility and use the netboot option. Boot loader Kickstart Starting kickstart loader> Uncompressing switch(boot)# system The boot loader uncompresses loaded software to boot an image using its file name as reference. These images are made available through bootflash. When the memory test is over, press Esc to enter the boot loader prompt. When the boot loader phase is over, press Ctrl-]3 (Control key plus right bracket key) to enter the switch(boot)# prompt. If the corruption causes the console to stop at this prompt, copy the system image and reboot the switch. System Login: - The system image loads the configuration file of the last saved running configuration and returns a switch login prompt. 1. This prompt or message appears at the end of each phase. 2. This prompt or message appears when the switch cannot progress to the next phase. 3. Depending on your Telnet client, these keys may be reserved, and you need to remap the keystroke. Refer to the documentation provided by your Telnet client. Figure 2-3 Regular and Recovery Sequence Regular Power sequence on 1 BIOS 2 Bootloader 3 Kickstart image 4 System image Access switch Interrupt regular sequence Power on No No No Ctrl-C bootable device Yes Yes Esc No Starting Yes kickstart CTRL-] No Un- Yes compressing Access image switch Yes No Yes No Recovery BIOS configuration Hanging state loader> prompt Hanging state Switch (boot)# prompt 3 = Kickstart image Power on and Ctrl-C 3 = Kickstart image Power on and Esc 4 = System image 79950 OL-9285-05 Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x 2-15