On 2014-02-27T11:05:21, Digimer <[email protected]> wrote:
> So regardless of quorum, fencing is required. It is the only way to
> reliably avoid split-brains. Unfortunately, fencing doesn't work on stretch
> clusters.
For a two node stretch cluster, sbd can also be used reliably as a
fencing mechanism.
It essentially uses the standard iSCSI protocol as a quorum mechanism.
Export one (1MB or so) iSCSI LU from each site to the other, and in the
best case, host one at a 3rd site as tie-breaker. Then run SBD across
these.
booth is striving to address even longer distances, where each site is a
truly separate cluster (e.g., independent corosync/pacemaker setups,
totem not running across the gap).
Regards,
Lars
--
Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB
21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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