[GLLUG] LVM / KVM Question

Ken Smith kens at kensnet.org
Tue Feb 15 17:25:08 UTC 2022

Andy Smith via GLLUG wrote:
> Hi,
> On Tue, Feb 15, 2022 at 10:19:32AM +0000, Ken Smith via GLLUG wrote:
>> I'm contemplating a system where I pass a LVM LV through to a KVM VM.
>> On the host I'm thinking that I could do a backup of the LV using a LVM
>> snapshot.
>> What am I missing, is this a mad idea?
> Many people do this. However:
> - Backed up data from the snapshot won't contain working data from
>    within the memory of the processes in the VM, so if you restored
>    from it, it would be like coming up after a power loss.
> - Lots of other KVM disk backends can do snapshots so LVM isn't
>    required to do this.
> Cheers,
> Andy
Thank you Andy, I agree a backup 'in flight' like this may have 
compromised integrity.

I'm also looking at QCOW snapshots.

:-) Ken

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