Re: [pve-devel] Proposal: support for atomic snapshot of all VM disks at once

[Ivaylo Markov via pve-devel <pve-devel@lists.proxmox.com>]

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From: Ivaylo Markov <ivaylo.markov@storpool.com>
To: Max Carrara <m.carrara@proxmox.com>, pve-devel@lists.proxmox.com
Subject: Re: Proposal: support for atomic snapshot of all VM disks at once
Date: Wed, 20 Nov 2024 18:10:01 +0200
Message-ID: <de35bf0d-5637-40a5-8286-a391807ab1d9@storpool.com>

Hello,

I've been caught up in other things and it's been a while, but as I was 
collating and testing my proposed changes, I came across this again and 
thought I'd clarify something.

On 08/10/2024 13:50, Max Carrara wrote:
>> I was directed here to discuss this proposal and my implementation idea
>> after an initial post in Bugzilla[1]. The goal is to give storage
>> plugins the option to perform atomic crash-consistent snapshots of the
>> virtual disks associated with a virtual machine where the backend
>> supports it  (e.g. Ceph, StorPool, and ZFS) without affecting those
>> without such a feature.
> Since you mentioned that the backends without such a feature won't be
> affected, will the disks of the storage types that *do* support it still
> be addressable individually? As in: Would it be possible to run both
> group snapshots and individual snapshots on a VM's disks? (I'm assuming
> that they will, but still wanted to ask.)
>
Do you mean this this as "you can snapshot the whole VM (all disks) at 
once *or* each disk individually" or "when making a snapshot of the 
entire VM, the user can chose between individual/group snapshot of all 
drives". What I have so far matches the first description, but I just 
realized you might have meant the second one, so I thought I'd ask and 
potentially create more work for myself :)

-- 
Ivaylo Markov
Quality & Automation Engineer
StorPool Storage
https://www.storpool.com

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