[Linux-cluster] fence device
sdake at redhat.com
Mon Aug 17 00:31:46 UTC 2009
On Mon, 2009-08-17 at 01:14 +0200, Jerome Fenal wrote:
> Le mercredi 12 août 2009 à 09:08 +0200, LEROUX Ludovic a écrit :
> > i have a linux redhat cluster with two redhat 5.3 nodes.
> > I have a shared iscsi disk with gfs.
> > And i created an oracle service which mounts the gfs file system and
> > start an oracle instance in fail over mode.
> > I have two questions:
> > 1°) I don't have a fence device. Is it possible to create a cluster
> > without a fence device?
> Having a fencing device is mandatory for supportability.
> You can open a support ticket to get directions in order to correct this
> with your actual setup.
> > 2°) is it possible to create a high available cluster with two or more
> > nodes which works together (for example http server).
> You mean multiple processes across multiple nodes for one service ?
It is possible using the cpg C programming interface but requires custom
development of the server application. If you are developing your own
server application, you may find this method of HA (replicated state)
man evs_overview to see the programming model. man -k cpg will show a
list of the apis.
Looks like we need a cpg_overview man page.
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