[Voyage-linux] aufs: Sync to flash with our reboot ?

[Kim-man 'Punky' TSE]

Hi Mike,

Currently it is not support, at least not the same way you can do like 
0.5.2.  There are some problem on it once 0.6 is now using aufs.

The /var/log you see in 0.6 is an aufs filesystem, which is mounted 
using two branches.  At the bottom the read-only /var/log and at the top 
a tmpfs /lib/init/rw/var/log.  All changes goes to /lib/init/rw/var/log.

The problem is since there are running process are using files in 
/var/log, so you cannot unmount or remount /var/log after sync operations.

I am exploring a way to have a new options that all writes will go to a 
standalone tmpfs using mount --bind options, so that when setup /var/log

1. mount /var/log to elsewhere say, /ro/var/log
2. copy /ro/var/log to /lib/init/rw/var/log
3. mount --bind /lib/init/rw/var/log /var/log
4. then you can do sync from /var/log to /ro/var/log periodically.
5. Before reboot, sync /var/log to /ro/var/log.

Regards,
Punky


Mike O'Connor wrote:
> Hi All
>
> Any ideas about how I might be able to sync the aufs to flash with our a
> reboot ?
>
> Mike
>
> _______________________________________________
> Voyage-linux mailing list
> Voyage-linux at list.voyage.hk
> http://list.voyage.hk/mailman/listinfo/voyage-linux
>   


-- 
Regards,
Punky

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