[DRBD-user] Pacemaker unable to start DRBD

[Robert Altnoeder]

While we're at it, a cluster should generally have redundant cluster
links (two physically separate network links with corresponding
interface sections in the corosync configuration), especially if one of
those links is also used as the DRBD replication link. Otherwise, any
loss of communication on the single link that runs both, the cluster
communication and DRBD replication, will typically cause a split brain
situation.
Additionally, fencing should be present to deal with any other
situations where either a node fails or network communication fails.
Fencing devices should be connected using an additional physically
separate link, so that it still works if the cluster links do not.

Best regards,
-- 
Robert ALTNOEDER - Software Developer
robert.altnoeder at linbit.com

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