[Pacemaker] Few questions

Dejan Muhamedagic dejanmm at fastmail.fm
Mon Feb 9 03:36:27 EST 2009


On Mon, Feb 09, 2009 at 01:26:56PM +0530, Glory Smith wrote:
> Hi All,
> Anybody worked on stonith external/sbd?? if yes please reply to my following
> mail.
> On Fri, Feb 6, 2009 at 2:27 PM, Glory Smith <xx2glory at gmail.com> wrote:
> > Hi All,
> > I am New to this list.  i have few questions related to stonith external
> > sbd plugin .
> >
> >  i saw that document says that read/write to thd sbd device is single point
> > of failure . if we configure multipath then this should not be SPOF anymore
> > . Right??

Right. Provided your local rat community doesn't consider the
cables edible.

> >  it says that other nodes can write fence request to the errant node's
> > mailbox and the errant node gets fenced.
> >  can any one explain when it will happen .

Whenever the CRM decides a node should be fenced. It has nothing
to do with sbd.

> > According to my understanding so far, as long as the node is having access
> > to sbd device it will not get fenced and once it looses access to the sbd
> > device it will reset itself . so when  other nodes will get chance to fence
> > a node by writing fence request?

Not true. A node may also get a "poison pill" from another node,
just as you mentioned yourself in the previous paragraph.



> >
> > Thanks
> >

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