I'm using plain dmcache for SSD cache - unmount procedure goes this way:
umount fs
suspend cache device
remove cache device
close lvm
close LUKS
shutdown
However sometimes dmsetup doesn't allow me to remove cache device throwing Device busy error, even if everything is synced before umount. Usual "fix" is to not suspend cache, sync everything and remove active cache device - but is it safe? Or can it result in data corruption?
