On Mon, 2007-10-29 at 00:20 +0000, Andrew Hole wrote:
> Hello!
>
> II want to create a very basic cluster of two nodes to configure
> failover of a service. This
> service is very simple, without shared storage. Basically if the
> service fails in a node, I want
> to ensure availability on the other node.
> I would like to clarify some doubts:
> - I need to use quorum disk?
If you have no shared storage, then a quorum disk is rather
impossible ;) (You don't need one.)
> - And about fince device? I need to setup a fince device?
Under most circumstances, you do not need a fence device if you do not
have any shared storage, but it can be helpful. Fencing exists to
prevent data corruption on shared media.
ex: node A goes to sleep with a write lock held...
node B thinks node A is dead, takes over, and acquires the same lock
a-> node A wakes up still thinking its lock is valid
b-> node A continues writing
(doom)
Power fencing prevents (a) (and therefore (b))
SAN-level fencing prevents (b)
> - Exists some example of using Cluster to configure a simple two nodes cluster?
http://sources.redhat.com/cluster/faq.html
http://sources.redhat.com/cluster/doc/nfscookbook.pdf
-- Lon
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