[pve-devel] [PATCH SERIES v2 pve-storage/qemu-server] add external qcow2 snapshot support

[Esi Y]

Thank you, Alexandre, for the background / historical information.

On Tue, Oct 22, 2024 at 4:54 PM DERUMIER, Alexandre
<alexandre.derumier at groupe-cyllene.com> wrote:
>
> -------- Message initial --------
> De: Esi Y via pve-devel <pve-devel at lists.proxmox.com>
> Répondre à: Proxmox VE development discussion <pve-
> devel at lists.proxmox.com>
> À: Proxmox VE development discussion <pve-devel at lists.proxmox.com>
> Cc: Esi Y <esiy0676+proxmox at gmail.com>
> Objet: Re: [pve-devel] [PATCH SERIES v2 pve-storage/qemu-server] add
> external qcow2 snapshot support
> Date: 22/10/2024 11:51:31
>
> > wasting developers time that then, among other things, delays actual
>
> >>I hoped this would bump it up for Alexandre to get a response.
> As far I remember, when we have implement snapshot for qcow2 (I think
> in 2010~2011, I'm becoming old ^_^ ) , only internal snapshot was
> possible,
> because they were no block-commit job. (to merge data in parent on
> snapshot deletion).

I just found it relevant to point out that historical Wiki on Live snapshots
were approaching this with the external-first in mind - when I look at
revisions [1], already in 2011:

"Internal snapshots to images which support internal snapshots (QCOW2 & QED)
are not expected to be supported initially."

> That mean that we don't have a clean snapshot solution currently for
> shared san/nas without api.

And that it is overdue at least since 2017 (the original forum attempt
at discussion,
not mine).

Anyhow, good that is now being reviewed. There's enough interested in the said
forum for this already.

NB I don't believe I should have been asked to take that supporting
input elsewhere.

[1] https://wiki.qemu.org/index.php?title=Features/Snapshots&diff=5964&oldid=1405