[ClusterLabs] principal questions to a two-node cluster
lists at alteeve.ca
Mon Apr 20 14:54:42 EDT 2015
On 20/04/15 01:21 PM, Michael Schwartzkopff wrote:
> APCs have an advantage over ILO. ILO will not answer if the power is gone. So
> the cluster will not continue. That missing feedback is much more unlikely
> from with an APC.
Use both, set IPMI (iLO) to run first. When IPMI fencing succeeds, you
are 100% sure the node is off. With PDU fencing, you are only sure of
the outlets being off. If someone messed up the wiring, the node could
actually still be on (so strap down and label the cables!).
Also, if you have redundant networking, you can use IPMI on switch 1 and
PDUs on switch 2 for additional protection.
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