[Linux-cluster] corosync ring failure

[Yvette S. Hirth, CCP, CDP]

On 07/24/2014 12:30 AM, C. Handel wrote:

> the switch has no load, interface utilization is below 10%, no crc
> errors on the ports and no errors in the log. On the same switch a
> second cluster (four machines, similiar config) is running fine.

hi,

did you vlan the switches so the two clusters are "logically separate"? 
  if they're on the same VLAN they might interfere with each other...

also i second Michael Schwartzkopff's suggestion of looking into 
Spanning Tree Protocol (STP).  if your switches (i'm assUming you're 
using two) are not stacked(1), you may be running into that, as well.

hth
yvette

(1) - stacking switches allows for double bandwidth operations, and can 
eliminate the need / requirement for STP - tho STP may still be in use.