Cant mount xfs lvm. Experimental Features?

[Marko Weber|8000]

hi eric,

Am 2015-08-25 20:18, schrieb Eric Sandeen:
> On 8/25/15 11:51 AM, Marko Weber|8000 wrote:
>> 
>> dave,
>> 
>> Am 2015-08-25 13:54, schrieb Dave Chinner:
>>> On Tue, Aug 25, 2015 at 10:25:16AM +0200, Marko Weber|8000 wrote:
>>>> 
>>>> Hello List, Hello Dave...
>>>> 
>>>> 
>>>> i try to mount on my backup server an Lvm Partition and get errors
>>>> in stdout and log:
>>>> 
>>>> /var/log/messages:
>>>> 
>>>> Aug 25 10:20:31 backupserver kernel: XFS (dm-2): Version 5
>>>> superblock detected. This kernel has EXPERIMENTAL support enabled!
>>>> Aug 25 10:20:31 backupserver kernel: Use of these features in this
>>>> kernel is at your own risk!
>>>> Aug 25 10:20:31 backupserver kernel: XFS (dm-2): Superblock has
>>>> unknown read-only compatible features (0x1) enabled.
>>>> Aug 25 10:20:31 backupserver kernel: XFS (dm-2): Attempted to mount
>>>> read-only compatible filesystem read-write.
>>>> Aug 25 10:20:31 backupserver kernel: Filesystem can only be safely
>>>> mounted read only.
>>>> Aug 25 10:20:31 backupserver kernel: XFS (dm-2): SB validate failed
>>>> with error 22.
>>> 
>>> You need to run the same version kernel on both servers. The primary
>>> has a more recent kernel and feature set than your older backup
>>> server is running.
>>> 
>>> Cheers,
>>> 
>>> Dave.
>> 
>> you was right.
>> There was new kernel built. /usr/src/linux pointed to new kernel 
>> source.
>> But machine was not rebooted. So kernel version before kernel built 
>> was loaded.
>> I rebooted machine.
>> i renoved logical volume
>> i created logical volume
> 
> Hope it landed back in the same place!
> 
>> i tried to mount it and get:
>> 
>> Aug 25 18:43:15 backupserver kernel: md4: unknown partition table
>> Aug 25 18:43:15 backupserver syslog-ng[1417]: Internal error, 
>> alarm_set() called while an alarm is still active;
>> Aug 25 18:43:56 backupserver kernel: md4: unknown partition table
>> Aug 25 18:44:01 backupserver kernel: XFS (dm-2): Invalid superblock 
>> magic number
>> 
>> pvdisplay shows:
>> 
>> # pvdisplay
>>   --- Physical volume ---
>>   PV Name               /dev/md4
>>   VG Name               VolGroup01
>>   PV Size               2.69 TiB / not usable 1.25 MiB
>> 
>> 
>> so what is XFS missing?
> 
> what does blkid /dev/md4 say?
> 
> It looks like you might have a storage problem, now, and xfs can't
> even find a proper magic number on that device.

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.


this happens with the newly created logical volume.

the other 2 lvm partitions with xfs are fine.

any idea?

marko








> 
> -Eric