From: Lon Hohberger <lhh@redhat.com>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] qdisk and fence race
Date: Mon, 18 Feb 2013 14:33:13 -0500 [thread overview]
Message-ID: <512281F9.9080901@redhat.com> (raw)
In-Reply-To: <24E144B8C0207547AD09C467A8259F7557A510DA@lisa.maurer-it.com>
On 02/13/2013 12:32 PM, Dietmar Maurer wrote:
> The following example is copied from 'man qdisk':
>
> <cman two_node="0" expected_votes="3" .../>
> <clusternodes>
> <clusternode name="node1" votes="1" ... />
> <clusternode name="node2" votes="1" ... />
> </clusternodes>
> <quorumd interval="1" tko="10" votes="1" label="testing">
> <heuristic program="ping A -c1 -w1" score="1" interval="2" tko="3"/>
> </quorumd>
>
> Is it true that this can still result is a fence race?
>
> If so, what is the suggested way to avoid that? Should I configure with master_wins="1" instead?
It's best to use master_wins over a heuristic. Ping as a tiebreaker
seems good in practice, but the problem is that there are certain
network failures where two nodes can see the thing they're pinging - but
not each other (e.g. some switch loops).
master_wins protects against this.
-- Lon
next prev parent reply other threads:[~2013-02-18 19:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-13 17:32 [Cluster-devel] qdisk and fence race Dietmar Maurer
2013-02-18 19:33 ` Lon Hohberger [this message]
2013-02-19 4:51 ` Dietmar Maurer
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