Hallo, David, Du meintest am 27.02.12:
[deleting btrfs partition] >> OK, the real problem you're seeing is that when btrfs removes a >> device from the filesystem, that device is not modified in any way. >> This means that the old superblock is left behind on it, containing >> the FS label information. What you need to do is, immediately after >> removing a device from the FS, zero the first part of the partition >> with dd and /dev/zero. > A correction here: if the device being removed is writable, the > superblock is cleared so it's not recognized as a part of any other > fs: [...] > Doing this manually means zeroing 4k block at all offsets up to > partition size: > Superblock 0 offset 65536 > Superblock 1 offset 67108864 > Superblock 2 offset 274877906944 > Superblock 3 offset 1125899906842624 > Superblock 4 offset 4611686018427387904 My actual experiments: dd if=/dev/zero of=/dev/sdxn bs=16M count=1 seems to be enough. Perhaps deleting the first 16 MByte is too much. Viele Gruesse! Helmut -- 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
