[Linux-cluster] fence device

[LEROUX Ludovic]

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? 
2°) is it possible to create a high available cluster with two or more nodes which works together (for example http server).
Thanks.
Ludo
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