[PVE-User] Adding a cluster node breaks whole cluster

Sten Aus sten.aus at eenet.ee
Tue Apr 14 11:02:02 CEST 2015

9000 MTU is based only on storage VLANs, which use 10G interfaces.

All Proxmox cluster communication uses VLAN15, MTU1500.

Rebooted Linksys switch, no good. Swapped to another dumb switch without 
VLANs - again no good.

cman restart in one node
*service cman restart*
Stopping cluster:
    Stopping dlm_controld... [  OK  ]
    Stopping fenced... [  OK  ]
    Stopping cman... [  OK  ]
    Unloading kernel modules... [  OK  ]
    Unmounting configfs... [  OK  ]
Starting cluster:
    Checking if cluster has been disabled at boot... [  OK  ]
    Checking Network Manager... [  OK  ]
    Global setup... [  OK  ]
    Loading kernel modules... ERROR: could not insert 'configfs': Exec 
format error

On 14.04.15 11:58, Dietmar Maurer wrote:
>> As I told you, we used dumb Linksys switch for cluster communication and
>> it all worked for weekend and yesterday. And yesterday evening whole
>> cluster is red again
>> Yesterday's log: http://pastebin.com/sLpnGgeS
>> Pure corosync log: http://pastebin.com/TzyUdYaJ
> Maybe a problem with packet fragmentation. Do you use special MTU sizes?

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