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

[Daniel Berteaud via pve-devel <pve-devel@lists.proxmox.com>]

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From: Daniel Berteaud <dani@lapiole.org>
To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>
Subject: Re: [pve-devel] Proposal: support for atomic snapshot of all VM disks at once
Date: Mon, 7 Oct 2024 09:12:46 +0200 (CEST)
Message-ID: <1324502869.237.1728285166262.JavaMail.zimbra@lapiole.org>



----- Le 4 Oct 24, à 17:13, Dietmar Maurer dietmar@proxmox.com a écrit :

> We already make sure that shaphots of a group of volumes are atomic at qemu
> level (VM is halted while snapshots are created), so I wonder
> if there is any real advantage here?

I think there could be one advantage : reduce the freez time during snapshot. I take regular snapshots of my VM, and it causes timeshifts of a few seconds (which chronyd inside the guest takes a bit a time to correct). It's just a 1-4 sec, but it can cause issues. One example is minio, when used with an OIDC login (as minio doesn't support any clock skew, login can fail if minio lags just a few seconds behind the IDP)

++

-- 
Daniel Berteaud



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