On Mon, Nov 18, 2019 at 03:08:00PM +0800, Qu Wenruo wrote: > On 2019/11/18 下午1:32, Qu Wenruo wrote: > > On 2019/11/18 上午10:09, Nathan Dehnel wrote: > >> I have a 10-disk raid10 with a missing device I'm trying to replace. I > >> get this error when doing it though: > >> > >> btrfs replace start 1 /dev/bcache0 /mnt > >> ERROR: target device smaller than source device (required 1000203091968 bytes) > >> > >> I see that people recommend resizing a disk before replacing it, which > >> isn't an option for me because it's gone. > > > > Oh, that's indeed a problem. > > > > We should allow to change missing device's size. > > I have CCed you with a patch to allow user to *shrink* the missing device. > > You can also get the patch from patchwork: > https://patchwork.kernel.org/patch/11249009/ > > Please give a try, since the device size is pretty small, I believe with > that patch, we can go quick shrink, that means "btrfs fi resize" command > should return immediately. So it can be recteated eg. on loop devices, where some of them are slightly smaller, then go missing and replace is started, right?
