Aufs Doesn't Seem To Work

[paulguy]

So, I'm trying to use an AUFS union on / so I don't end up filling the nand when I install stuff, so I created an 8 gig ext2 image on my SD card, at /media/mmcblk1p1/unionfs.img using default settings.

I then mount it on /media/union, since nothing seems to be mounted there anyway:

mount -t ext2 -o loop /media/mmcblk1p1/unionfs.img /media/union

I then try to mount the union on /:

mount -t aufs -o br=/media/union=rw:/=ro none /

When I write any files, they go to NAND, though. They don't appear in /media/union, I only see lost+found there. It appears as mounted when I execute mount. It also can't be unmounted like this, though I am probably doing this wrong:

umount.aufs /

I just get "Inappropriate ioctl for device".

I've searched around for information, and couldn't find anything, so I'm wondering if I'm doing something wrong or something is just screwed up.

 

[illusionx]

You can't just remount / as an aufs I tried to do the same thing. You can probably do it with all the directories under / but not / itself due to it being 'special'

 

[urjaman]

Yeah dont try to AUFS '/'. (' to not say slashdot ). It is possible, but If i were you I wouldnt go building an initramfs just yet...

 

[paulguy]

Hmm, OK, I figured it was something like that. I guess I'll just aufs home and usr.