[Linux-HA] Fencing prevents resource from failing over
beekhof at gmail.com
Mon Nov 26 01:13:37 MST 2007
On Nov 26, 2007, at 6:25 AM, <abhishek.bagchi at wipro.com> <abhishek.bagchi at wipro.com
> I've a 2 node active/passive cluster ( active node=>active , passive
> node=>standby) using heartbeat 2.0.8 . I recently enabled stonith .
> stonith device is an rsh device that tries to restart the cluster
> However, something that used to work with stonith disabled has stopped
> working now ; Node failover on network cable disconnection. I believe
> since the stonith device uses the network, the stonith fails and hence
> the resource is left wherever it was running.
correct. the cluster will not start anything until it can verify the
node is truly dead (with a successful stonith operation)
this is how a stonith enabled cluster is supposed to work and is why
IP-based stonith modules are not a great idea.
> Can anyone please help resolve this problem (this is probably not a
> problem and this is how stonith is expected to work )? I would like to
> know if there's anyway to tell the passive (currently active node) to
> give up trying to stonith and then start the resource.
by design - no.
> I've attached my
> cib file and logs from the passive when cable is disconnected.
> I've no problem both nodes running the resource as active is anyway
> cut-off from network and can't do any damage.
if thats truly the case, then you may not need stonith.
> The standby log seems to
> say it has quorum
2-node clusters always have quorum, so the value is meaningless...
> but it makes me wonder why it doesnt start the
> resources , inspite of the following evident from the logs.
> 1. Standby marks active unclean
> 2. Standby has quorum
> 3. Standby tries to move resources back to standby
> Thanks in advance,
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