[Ocfs2-users] What happens if Ethernet connection dies

[Sunil Mushran]

In a two node situation, if the nodes miss network hbs, but
still can see each other on disk, the higher node will fence itself.

Weller, Michael wrote:
> Dear List,
>
> I now have a different problem, which might cause us to stop using
> o2cfs.
>
> We still have two HP-machines, redundantly connected to an HP-san with
> an EVA 6000. Each has two network cards which are bundled with bonding.o
> as active-standby. They are connected to a switch.
>
> Now, if there is a problem with the network, or if one machine is
> disconnected from the switch: Both machines are self-fencing!
>
> Installed are:
> rhenad:~ # rpm -q ocfs2-tools
> ocfs2-tools-1.1.4-0.5
> rhenad:~ # rpm -q ocfs2console
> ocfs2console-1.1.4-0.5
>
> We cannot really make an update, at least not a kernel update, as we
> will loose SAN certification and experiments show, that the SAN and
> failover won't work than. Oh yes, all this is from SLES9 SP3
>
> Question: Of course, our main idea to use ocfs was, that if one node
> crashes or looses network connection or something, that the other one
> survives. At the moment it seems, that if one node has problems, both
> are self-fencing.
>
> What is the official opinion here, and what can we do to address that
> problem?
>
> Would having each link of the fault-tolerent pairs on a different lan
> switch (for redundancy) help? This way, a lan-switch lockup (as it
> happened on us) won't be a problem, however, if one(!) machine crashes
> or looses network connection, is there a chance for an ocfs2 cluster to
> survive?
>
> Thanks in advance,
> Michael.
>
> ---
>
> Dr. Michael Weller
>
> ITZ Informationstechnologie GmbH
> Consulting/Systemengineering
> Bismarckstrasse 57
> D-45128 Essen
>
> Phone Office  +49 201 24714 28
> FAX   Office  +49 201 24714 33
> Phone Mobile  +49 172 2178078
> E-Mail        mailto:michael.weller at itz-essen.de
>
>
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