[Linux-cluster] Starter Cluster / GFS
gordan at bobich.net
Thu Nov 11 09:23:45 UTC 2010
Jankowski, Chris wrote:
> Digimer wrote:
>>>> Both partitions will try to fence the other, but the slower
>>>>will lose and get fenced before it can fence.
> Well, this is certainly not my experience in dealing with modern
> rack mounted or blade servers where you use iLO (on HP) or DRAC (on Dell).
> What actually happens in two node clusters is that both servers
> issue the fence request to the iLO or DRAC. It gets processed
> and *both* servers get powered off. Ouch!! Your 100% HA cluster
> becomes 100% dead cluster.
Indeed, I've seen this, too, on a range of hardware. My quick and dirty
solution was to doctor the fencing agent to add a different sleep() on
each node, in order of survivor preference. There may be a setting in
cluster.conf that can be used to achieve the same effect, can't remember
off the top of my head.
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