Re: [dm-devel] Device removal handling

[Alasdair G Kergon <agk redhat com>]

If you want to remove a dm device forcibly, replace it with an 'error' target
that will return I/O errors.  (dmsetup remove -f)

(But devices should be removed from the top down, obviously, and if
it's your main filesystem, you could e.g. set up a ramdisk do do
this from.)

Alasdair