[linux-lvm] Thin dump errors on snapshot of lvm metadata

[shankha]

I tried out the latest version (device-mapper-persistent-data-0.5.5-2)
of thin dump ().
I still get the error message :

"metadata contains errors (run thin_check for details).
perhaps you wanted to run with --repair"

so I assume something is wrong with taking the snap

dmsetup message /dev/mapper/VG-POOL-tpool 0 release_metadata_snap

Thanks
Thanks
Shankha Banerjee


On Tue, Nov 24, 2015 at 11:03 AM, shankha <shankhabanerjee at gmail.com> wrote:
> I am trying to run thin dump on the snapshot of lvm thin pool metadata.
>
> The commands used to generate the snapshot and take the thin dump output are:
>
> dmsetup message /dev/mapper/VG-POOL-tpool 0 reserve_metadata_snap
> block_no=`dmsetup status /dev/mapper/VG-POOL-tpool | cut -f 7 -d " "`
>
> thin_dump -f xml /dev/mapper/VG-POOL_tmeta -m $block_no
>
> dmsetup message /dev/mapper/VG-POOL-tpool 0 release_metadata_snap
>
> While creating the snapshot I am dumping data to the thin volume.
>
> The error message I get is:
> "metadata contains errors (run thin_check for details).
> perhaps you wanted to run with --repair"
>
> Is there something wrong with the way I am using the commands ?
>
> Thanks