Hello, i'm trying to test the new btrfs filesystem in opensuse factory. i have currently followin kernel and btrfs packages installed: kernel-default-2.6.30-10.1 btrfsprogs-0.19-2.2 i'm running this in VirtualBox 3.0.2 i can create btrfs on /dev/sdb1 but when i mount it , i get following error : linux-m4pt:/home/luc # mount -vvvv /dev/sdb1 /data mount: fstab path: "/etc/fstab" mount: mtab path: "/etc/mtab" mount: lock path: "/etc/mtab~" mount: temp path: "/etc/mtab.tmp" mount: UID: 0 mount: eUID: 0 mount: spec: "/dev/sdb1" mount: node: "/data" mount: types: "(null)" mount: opts: "(null)" mount: you didn't specify a filesystem type for /dev/sdb1 I will try type btrfs mount: mount(2) syscall: source: "/dev/sdb1", target: "/data", filesystemtype: "btrfs", mountflags: -1058209792, data: (null) mount: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so looking in dmes , i see following : [ 3086.053308] device fsid 3446bae7efc3e33f-daf4e58f9a3617ae devid 1 transid 7 /dev/sdb1 [ 3086.054435] BTRFS: couldn't mount because of unsupported optional features (1). [ 3086.054593] btrfs: open_ctree failed checking the device seems to be ok linux-m4pt:/home/luc # btrfsck /dev/sdb1 found 28672 bytes used err is 0 total csum bytes: 0 total tree bytes: 28672 total fs tree bytes: 4096 btree space waste bytes: 23875 file data blocks allocated: 0 referenced 0 Btrfs Btrfs v0.19 luc -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-factory+help@opensuse.org