interface checking for heartbeat
Michael E Brown
michael_e_brown at dell.com
Tue Feb 6 11:07:11 MST 2001
On Tue, 6 Feb 2001, Jos Visser wrote:
> I receive a flood of replies from various hosts on my subnet. If I only
> see myself answering, either the netic is down, or there are no other
> hosts up in the entire network (unlikely).
I am helping evaluate a commercial clustering app that uses precisely this
method to determine interface healthiness, and let me tell you, I don't
think it is reliable. The main thing is that you need to know your network
setup. In the setup we were testing, we had an isolated subnet for the
cluster, and there were many times where a broadcast ping would get no
reply. (Mainly when your partner is down) This leads to all sorts of
weirdness in cluster state.
If you know that broadcast ping will work in your environment, then that
is great. But don't hardcode that in as a test (Like this commercial app),
or you are asking for trouble.
Linux Systems Group
Dell Computer Corp
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