How to umount initrd?

[Pan ruochen]

>2009/10/30 Vladimir Dronnikov <dronnikov at gmail.com>:
>
> First try without umount -n /old_root. When after /sbin/init is run
> you are in console, try umount /old_root manually. Does it work?
>
> BTW, what is "-n" option for umount?
>
> --
> Vladimir
>

umount /old_root manually in the console doesn't work.
All underlying files and directories except old_root itself can be removed.

-n means doesn't update /etc/?tab by the manpage.

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PRC