[PVE-User] Losing quorum - cluster broken

Michael Rasmussen mir at miras.org
Thu Apr 23 17:34:45 CEST 2015

On Thu, 23 Apr 2015 16:06:48 +0200
Nicolas Costes <nicolas.costes at univ-nantes.fr> wrote:

> # apt-get install ethtool
> # ethtool --show-offload  vmbr0
> # ethtool --offload  vmbr0 rx off  tx off
> [...]
> [udp sum ok] 
> Thanks, i've learnt something. Not sure if this will help the cluster staying 
> up, right ?
It should since the udp checksum is now correct. What you have
experiencing is checksum failures which effectively means that your
multicast traffic was broken since checksum failure will cause the nics
to drop the packages.

So why did it work before and not now?

1) the driver was loaded before with checksum offload disabled by
default and now it is by default loaded.
2) A regression in the network driver which have broken checksum

What nics are you using?

Michael Rasmussen

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