[Linux-cluster] SCSI PR fencing

[Rajeev P]

Ryan,

thank you.

Rajeev


On 2/6/09, Ryan O'Hara <rohara at redhat.com> wrote:
>
> On Fri, Feb 06, 2009 at 12:10:34AM +0530, Rajeev P wrote:
> > Hi,
> >
> > Consider a two node RHEL5 cluster that is configured with SCSI PR fencing
> > but without a qdisk. In the event of network split, nodes will attempt to
> > fence the other one. One of the node's (node that lost the race) key will
> be
> > successfully removed from the disk and key of the node that won race will
> be
> > present on the disk.
>
> This is correct.
>
> > The question I have is that, in the event of a network split, is there a
> > possibility (even remote) for both the nodes to "successfully" fence each
> > other? That is key of both the nodes are successfully removed from the
> > disk.
>
> It should not be possible for both nodes to remove the other node's
> key. The first "unregister" command to hit the scsi device will
> determine the winner. The reason this works is due to the fact that
> a node must be registered with a device in order to remove keys.
>
> Ryan
>
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