Znyx Networks bh5700 - Manual (Page 141)

Booting with the –i option
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.
• 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
• Initiating the –i option of zbootcfg.
zbootcfg –d 1 –i
• Reboot the system. After the reboot, clear the –i option from the boot string. Enter the
following command:
zbootcfg –d 1
The reboot command will also take “-i” as an option and pass it to the Linux boot,
reboot -i
• When the system boots, the overlay file system is returned to the factory-installed
configuration. At this point, you have a few options.
• Run zsync and the factory-installed system will be restored to your flash.
NOTE: All changes you have made and saved prior to the zsync command will
be lost.
• 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.
zmnt /tmp
cp /tmp/etc/hosts /etc/hosts
zsync /etc/hosts
• Reboot the system.
Ethernet Switch Blade User's Guide release 3.2.2j page 141