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Having files on btrfs subvolumes requires to give mount options. Add boot params archisoflags= and cow_flags= for this purpose. Boot parameters could look like this: ... archisodevice=/dev/sdaX archisoflags=subvolume=isos cow_device=/dev/sdaX cow_flags=subvolume=persist ... Signed-off-by: Christian Hesse <mail@eworm.de>
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