[pve-devel] [RFC docs 13/13] vzdump: add section about backup fleecing

DERUMIER, Alexandre alexandre.derumier at groupe-cyllene.com
Thu Jan 25 17:41:54 CET 2024

Hi Dietmar !

>>Stupid question: Wouldn't It be much easier to add a simple IO-buffer
>>with limited capacity, implemented inside the RUST backup code?

At work, we are running a backup cluster on remote location with hdd , 
and a production cluster with super fast nvme,
and sometimes I have really big write spikes (in GB/s), so it's
impossible for the backup storage or network to handle it without
increase latency or saturate link.

So with limited capacity (how much ? in memory ?), I don't think it
solve the problem. If the buffer is full, the vm write will hang.

> +WARNING: Theoretically, the fleecing image can grow to the same size
> as the
> +original image, e.g. if the guest re-writes a whole disk while the
> backup is
> +busy with another disk.
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