Historically those DIRs contained all utils/tools to manage the system
and fix problems etc. when you are unable to get /usr up, i.e. when it's
remote. The rootfs basically contained all the core system-tools minus
all the apps, which usually were managed centrally. 

With bbox of course one could mimic this to a certain point easily
within an initramfs though.

Regards

-Sven


On Mon, 2011-08-01 at 15:45 +0300, Samuli Suominen wrote:

> "Historically /bin, /sbin, /lib had the purpose to contain the utilities
> to mount /usr. This role can now be taken by the initramfs. Because the
> initramfs knows, where to find the root partition (which includes /etc),
> it can parse /etc/fstab and other configuration files and mount /usr
> before it finally switches the root partition and executes
> /usr/bin/init. From this point on init mounts the remaining partitions
> in /etc/fstab and the system starts as usual."
> 
> >>
> >> Cheers,
> >> Kacper
> >>
> > 
> > 
> 
> 



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