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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 –i passed 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
-i and press Return
Linux/PPC load: root=/dev/ram init=/sbin/init -i
2. Initiating the –i option of zbootcfg.
zbootcfg –d 1 –i
3. Reboot the system. After the reboot, clear the –i option from the boot string. Enter the
following command:
zbootcfg –d 1
4. The reboot command will also take -i as 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