Am 2015-08-26 00:58, schrieb Eric Sandeen:

On 8/25/15 5:53 PM, Marko Weber|8000 wrote:

quoted

eric,
i rebootet the machine and created a new logical volume.
i formatted the lv with mkfs.xfs
i tried to mount it on the new kernel:

Aug 26 00:47:17 backupserver kernel: XFS (dm-2): Version 5 superblock 
detected. This kernel has EXPERIMENTAL support enabled!
Aug 26 00:47:17 backupserver kernel: Use of these features in this 
kernel is at your own risk!
Aug 26 00:47:17 backupserver kernel: XFS (dm-2): Superblock has 
unknown read-only compatible features (0x1) enabled.
Aug 26 00:47:17 backupserver kernel: XFS (dm-2): Attempted to mount 
read-only compatible filesystem read-write.
Aug 26 00:47:17 backupserver kernel: Filesystem can only be safely 
mounted read only.
Aug 26 00:47:17 backupserver kernel: XFS (dm-2): SB validate failed 
with error 22.

l
http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F
...

quoted

this happens with the newly created logical volume.

the other 2 lvm partitions with xfs are fine.

any idea?

Without any actual information (i.e. kernel versions or userspace 
version),
I'll have to assume that you have recent xfsprogs which sets some 
features by
default which older kernels cannot understand.

ok, what info do you need?

on gentoo-linux:

xfsprogs: v 3.2.4 (Useflag, nls readline)
kernel:   3.14.51

quoted

Aug 26 00:47:17 backupserver kernel: XFS (dm-2): Superblock has 
unknown read-only compatible features (0x1) enabled.

#define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)         /* free inode 
btree */

mkfs.xfs with -m crc=0,finobt=0 to turn off these features if you have
an older kernel which
doesn't understand them.

-Eric

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