Re: [pve-devel] [PATCH-SERIES v8 pve-storage/qemu-server] add external qcow2 snapshot support

["DERUMIER, Alexandre via pve-devel" <pve-devel@lists.proxmox.com>]

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From: "DERUMIER, Alexandre" <alexandre.derumier@groupe-cyllene.com>
To: "pve-devel@lists.proxmox.com" <pve-devel@lists.proxmox.com>, "t.lamprecht@proxmox.com" <t.lamprecht@proxmox.com>
Subject: Re: [PATCH-SERIES v8 pve-storage/qemu-server] add external qcow2 snapshot support
Date: Thu, 17 Jul 2025 08:01:01 +0000
Message-ID: <ed658e13ad9c6e02454ba29f462ca0515d8234da.camel@groupe-cyllene.com>

>>
>>
>>Wolfgang now applied all patches and some follow-ups, we test this a
>>bit
>>more internal, but if nothing grave comes up this should be included
>>in
>>upcoming PVE 9 - great work!

Fantastic !  I would like to thank you guys for your support ! So
thanks Fiona, Fabian, Wolfgang, Thomas for the help, review, ideas, and
for your time on this ! 


>>btw. and mostly out of interest: What was the status for using qcow2
>>for
>>thin-provisioning idea again? I know there was some discussion, but
>>could
>>not quickly find what the last status was.

for lvm+qcow2 provisionning, it's really early POC/RFC. (I have sent
some patches 1year ago). 
https://lore.proxmox.com/all/mailman.400.1724670042.302.pve-devel@lists.proxmox.com/

I'll try to work on it after this summer for pve9.1.
The main thing to work is how to handle cluster storage lock for lvm
resize.

Qemu send an event when the used size reach a threshold to qmeventd,
Pvestatd can also sent an event on disk full by security 

Then, some kind of daemon need to resize the lvm with a global lock.
I think we can use a local daemon on each node, then maybe use lock
through pmxcfs, with some kind of queue file with error/retry handling.

 




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