Znyx Networks bh5700 manual Booting Without the Overlay File, Properly attach the console cable

properly attach the console cable.

Booting Without the Overlay File

If you cannot telnet into the switch and Linux fails to boot, it is likely that a change saved by zsync has left the switch in an inaccessible state. To allow users to recover from mistakes saved in the overlay file system, a boot argument of –ipassed to the init process will stop the untarring of the saved overlay files. As a result, the system boots to the factory-shipped configuration.

1.Connect through the console port. During boot up, the system displays the Linux boot string. Linux/PPC load: for 5 seconds. During the 5 second pause, enter the boot option -iand press Return

Linux/PPC load: root=/dev/ram init=/sbin/init -i

2.Initiating the –ioption of zbootcfg. zbootcfg –d 1 –i

3.Reboot the system. After the reboot, clear the –ioption from the boot string. Enter the following command:

zbootcfg –d 1

4.The reboot command will also take -ias an option and pass it to the Linux boot, reboot -i

5.When the system boots, the overlay file system is returned to the factory-installed configuration. At this point, you have a few options.

Caution: All changes you have made and saved prior to the zsync command will be lost when the command executes.

a)Enter zsync, and the factory-installed system will be restored to your flash.

b)Restore particular files from the existing overlay. Use the zmnt command to mount the overlay in a designated directory and copy back just the changes you want to keep from the existing overlay.

For example, if you wanted to recover your /etc/hosts file from the existing overlay, use zmnt to mount the overlay in a designated directory, like /tmp, then copy /tmp/etc/hosts to /etc/hosts. Lastly, use zsync to save your changes (as follows).

zmnt /tmp

cp /tmp/etc/hosts /etc/hosts

zsync /etc/hosts

6. Reboot the system.

Ethernet Switch Blade User's Guide release 3.2.2j page 158