On 2008-09-12T15:15:00, NAKAHIRA Kazutomo <[EMAIL PROTECTED]> wrote:
> Hi, Lars
>
> Please let me question on SBD function.
>
> SBD is effective to the node fencing without the hardware control
> board (such as RSA, iLO, etc..), but SBD seems not to have the
> function for exclusive execution control.
>
> It seems that the SBD kills each other at the same time according to
> the timing of the STONITH execution. Is this recognition right?
>
> Please point it out if SBD has exclusive execution control function or
> is something a extra setting necessary to prevent mutual hit of
> STONITH.
That is not different at all from any other STONITH device, actually;
except of course those which only allow a single session, which are not
all that common.
But: that first requires a split-brain, which redundant comm paths
should render rare. Then, it requires the side previously without a DC
to detect that the other nodes are gone, elect a DC, go through the
processes of PE->TE->STONITH, within 1s of the time it takes the
partition with a DC already to fence the other side.
That is not exactly "highly probable" in practice.
But if you have an idea of how to implement that, I'm all ears.
(SCSI reservations could deliver slightly more than this, but that is
not exactly trivial to implement right.)
Regards,
Lars
--
Teamlead Kernel, SuSE Labs, Research and Development
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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