winchell at mclinux.com
Wed Jul 5 09:13:56 MDT 2000
"Hergott, Jean-Philippe" wrote:
> Hi all,
> I was reading with great interest mails concerning kimberlite-piranha
> projects. I've got concern with the shared bus technology, and was asking
> myself about the stonith method. What is it ? ok I found answer at
> linux-ha.org/stonith.html and at the present time I'm a little bit
> disappointed because if I understand well ( english is not my mother
> language ) to share a bus in kimberlite solution you need to 'shot the other
> node in the head' so you only have one active node at the time. So it seems
> to me that is a shared bus only for the surviving node and if both of the
> system are not dead ( Risk associated with STONITH paragraph ). Am I right ?
With no failures, one can boot two nodes and form a two node cluster
with kimberlite. Services can be run on both of the nodes at once.
For example, one can run NFS services on node A and node B, where different
file systems are exported on the two nodes. Or, one can run independent
instances of oracle on the two nodes. With Oracle OPS one can have instances of
oracle on both nodes operating on the same database. Its only when a failure
is detected that a node is shot. Services that were handled by the shot node
are automatically restarted on the survivor. After this, the shot node may reboot
and join the cluster. At this point, depending on settings, services may
automatically migrate back to the new member.
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