Re: [PVE-User] Corosync and Cluster reboot

[Gilberto Ferreira <gilberto.nunes32@gmail.com>]

1. Because the value is automatically calculated is better to increase
the value "retransmits_before_loss_const" (or decrease the "token"
value) than to set a constant (200 milliseconds for example)?

Well... as I said in my scenario, I just add the line token with the value
200.
I'm afraid I lack the proper knowledge to go deeper.

2. If I alter this value and in the future a node will be added/removed,
the value will remain the same or it will be recalculated?

Yes! The corosync.conf in /etc/pve will be sinc to any new server add to
the cluster, via pmxcfs.

Best regards
---


Em ter., 7 de jan. de 2025 às 11:06, Iztok Gregori <iztok.gregori@elettra.eu>
escreveu:

> On 07/01/25 13:33, Gilberto Ferreira wrote:
> > Just to clarify, I had a similar issue in a low latency network with 12
> > nodes cluster, all with 1G ethernet card.
> > After adding this token_retransmit to corosync.conf, no more problems.
> > Perhaps that could help you.
> >
> >
> >
> >
> >
> >
> > Em ter., 7 de jan. de 2025 às 09:01, Gilberto Ferreira <
> > gilberto.nunes32@gmail.com> escreveu:
> >
> >> Try to add this in corosync.conf in one of the nodes:  token_retransmit:
> >> 200
> >>
>
> Hi and thank you for your suggestion!
>
> Right now this is the configuration of the token in our cluster:
>
> > root@aaa:~# corosync-cmapctl | grep token
> > runtime.config.totem.token (u32) = 12750
> > runtime.config.totem.token_retransmit (u32) = 3035
> > runtime.config.totem.token_retransmits_before_loss_const (u32) = 4
>
> The token_retransmit is calculated automatically by the formula
>
> token / (token_retransmits_before_loss_const + 0.2)
>
> and in our case is 3035 miliseconds. I have 2 questions:
>
> 1. Because the value is automatically calculated is better to increase
> the value "retransmits_before_loss_const" (or decrease the "token"
> value) than to set a constant (200 milliseconds for example)?
> 2. If I alter this value and in the future a node will be added/removed,
> the value will remain the same or it will be recalculated?
>
>
> Thanks
> Iztok
>
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