[Pacemaker] Does pingd works on openais?

Serge Dubrouski sergeyfd at gmail.com
Wed Mar 19 09:00:05 EDT 2008

On Wed, Mar 19, 2008 at 3:20 AM, Atanas Dyulgerov
<atanas.dyulgerov at postpath.com> wrote:
>  -----Original Message-----
>  From: Lars Marowsky-Bree [mailto:lmb at suse.de]
>  Sent: Tuesday, March 18, 2008 4:59 PM
>  To: The Pacemaker cluster resource manager
>  Subject: Re: [Pacemaker] Does pingd works on openais?
>  On 2008-03-10T11:13:51, Atanas Dyulgerov <atanas.dyulgerov at postpath.com> wrote:
>  >> STONITH brutally shutdowns a node. To do that you need redundant
>  >> communication lines, smart power devices and definitely a local
>  >> cluster. For geographically separated cluster with remote nodes
>  >> STONITH is not applicable.  The method is called Node Fencing and as I
>  >> said it has too many obstacles.
>  >
>  >All fencing methods require a means of communicating with the device; in
>  >case of WAN clusters, the link between the (replicating) storage arrays
>  >(for example) will also be cut - resource fencing is unavailable for the
>  >same reasons as STONITH is.
>  The case when node loses connectivity to the cluster but it still remains
>  connected to the shared resource. Then the other nodes which retain quorum
>  can lock the shared storage resource to stop the errant node from accessing
>  it. This fencing method does not require communication with the failed node.
>  That's what RHCS do I believe.

I don't know about RHCS 4.0 but 3.0 used to kill a diconnected node.
In fact it was shipped with a STONITH module :-) HP
ServiceGuard,Veritas VCS and Oracle RAC killed a failed node as well.
Though it was done through halt on a disconnected node when it wasn't
able to lock a shared device.

Serge Dubrouski.

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