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2-14
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 2 Troubleshooting Installs, Upgrades, and Reboots
Troubleshooting Cisco SAN-OS Software System Reboots
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
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.
The BIOS is corrupted. Replace this module. Contact your customer support
representative to return the failed module.
The kickstart image is corrupted. 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.
Boot parameters are incorrect. Verify and correct the boot parameters and reboot.
The system image is corrupted. 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.
Table 2-5 Power-on or Switch Reboot Hangs (continued)
Problem Possible Cause Solution
Loads loader
Loads kickstart image
Loads kernel,
basic drivers, and
system image
Login prompt
1. BIOS
2. Loader
3. Kickstart image
4. System image
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