> Yes, the xino is stored on the /cow.  I think other things
> are probably using /cow as well since *any* modified files
> are automatically put on the /cow.

Actually, if you remounted the aufs root / as ro, then nothing else
has write access to your /cow any longer EXPECT the aufs (due to
xino).

So please first try to mount aufs with the xino option, to ensure xino
file is NOT on your /cow

you can do it this way:
mkdir /memory
mount -t tmpfs tmpfs /memory
mount -t aufs -o xino=/memory/xino ...etc  (I don't remember current
aufs mount options)
// add branches here etc

Then when you remount, do as you did:
mount -o remount,ro /
#set all aufs branches as readonly (I don't remember command for that)
#mount -o remount,ro /cow


> Maybe after setting /
> to (ro), I should attempt to disable the xino file somehow?

nope, that's not possible. You must put the xino file to another
filesystem (eg to memory, as explained above) during you INITIALIZE
your aufs root (eg at the boot time)

> The /cow is definitely in use...

use 'lsof' command to see what files are opened then...



Tomas M
slax.org

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