On Jan 30, 2014, at 2:43 PM, Hugo Mills <h...@carfax.org.uk> wrote: > On Thu, Jan 30, 2014 at 09:27:55PM +0000, Maziarz, Jeremy M. wrote: >> Everyone, here is a noob question: how do completely delete a btrfs >> filesystem (RAID10)? > > wipefs, on each device, is the precision approach -- it will very > carefully damage the magic number in the first superblock on each > device, which is enough to make most tools ignore the filesystem. > > Alternatively, the nuclear approach is simply to overwrite the > first megabyte or so of the filesystem with zeros, with something like: > > dd count=1k bs=1k if=/dev/zero of=/dev/sda
Yes with the older btrfs-progs, it indicates maybe equally old linux-utils so wipefs -a might not be up to date to delete all of the super block magics. It's worth knowing especially because mkfs.ext4 resurrects the latent btrfs back to life if the wipefs -a doesn't remove all super blocks. Also fwiw, it's possible to use wipefs -a /dev/sd[abcd] in a single command for all drives. Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
