[PVE-User] BIG cluster questions

JR Richardson jmr.richardson at gmail.com
Sat Jun 26 14:59:43 CEST 2021

That is a big cluster, I like it, hope it works out. You should separate the
corosync/heartbeat network on its own physical Ethernet link. This is
probably where you are getting latency from. Even though you are using 25Gig
NICs, pushing all your data/migration traffic/heartbeat traffic, across one
physical link bonded or not, you can experience situations with a busy link
where your corosync traffic is queued, even for a few milli seconds, this
will add up across many nodes. Think about jumbo frames as well, slamming a
NIC with 9000 byte packets for storage, and poor little heartbeat packets
start queueing up in the waiting pool.

In the design notes for proxmox, it's highly recommended to separate all
needed networks on physical NICs and switches as well.

Good luck.

JR Richardson
Engineering for the Masses
Chasing the Azeotrope
JRx DistillCo
1'st Place Brisket
1'st Place Chili

This is anecdotal but I have never seen one cluster that big. You might want
to inquire about professional support which would give you a better
perspective for that kind of scale.

On Thu, Jun 24, 2021 at 10:30 AM Eneko Lacunza via pve-user <
pve-user at lists.proxmox.com> wrote:

> ---------- Forwarded message ----------
> From: Eneko Lacunza <elacunza at binovo.es>
> To: "pve-user at pve.proxmox.com" <pve-user at pve.proxmox.com>
> Cc:
> Bcc:
> Date: Thu, 24 Jun 2021 16:30:31 +0200
> Subject: BIG cluster questions
> Hi all,
> We're currently helping a customer to configure a virtualization 
> cluster with 88 servers for VDI.

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