Re: LVM snapshot and log record CRC mismatch

[Eric Sandeen <sandeen@xxxxxxxxxxx>]

On 5/26/16 6:17 AM, Gionatan Danti wrote:
> On 26/05/2016 12:23, Emmanuel Florac wrote:
>> Le Wed, 25 May 2016 09:37:41 +0200
>> Gionatan Danti <g.danti@xxxxxxxxxx> Ãcrivait:
>>
>>> The snapshot is accomplished using the following commands:
>>>
>>> lvcreate -s hypervisor/KVM_Storage --name Backup_SNAP
>>> lvchange -ay -K hypervisor/Backup_SNAP
>>> mount -o nouuid /dev/hypervisor/Backup_SNAP /mnt/lvm/
>>>
>>
>> You need to use xfs_freeze to make the filesystem coherent before
>> snapshot:
>>
>> xfs_freeze /dev/hypervisor/KVM_Storage
>> lvcreate -s hypervisor/KVM_Storage --name Backup_SNAP
>> xfs_freeze -u /dev/hypervisor/KVM_Storage
>> lvchange -ay -K hypervisor/Backup_SNAP
>>
> 
> It was my understanding that filesystem freezing was automatically managed by 
> LVM, and integrated into VFS long ago.
> 
> I am missing something?

Nope, you are correct.  lvm snapshots handle fs quiesce.

-Eric