Comment 3 for bug 1279660

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Phillip Susi (psusi) wrote : Re: luks+lvm+btrfs raid1 confuses linux

I believe this is just lvm: there is no user friendly way to shut it down so you can unplug an external lvm disk. You will need to manually run lvchange -an on the logical volumes residing on the disk, or better yet; don't use lvm on an external disk.