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Old 11-10-2010, 05:01 PM   #1
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Cluster storage power fencing help

I currently have a GFS/cman cluster setup for data storage. Now to make it truly redundant I'm adding a external fencing (power fencing)mechanism into the cluster.

Now this is where my question begins.

Let say for example, I have Node 1 and 2. Node 2 unexpectedly crashes, so Node1 detects an issue within the cluster. Now node1 will attempt to power fence node2.

Q1) Does power fencing require a ACK from the fencing device ? Let say the power switch had crashed. When node sends the fencing signal to the power switch, there is no response coming back from the fencing device. In this case, does node1 will wait until it receive a response from the fencing device before continuing the cluster operations ?

Q2) Does the cluster operation resume right after the power fencing starts? Or does it wait until it hears something back from node2 or a fencing timeout before it resumes operation ?

Q3) Which power fencing device is the most reliable ? I assume APC power switches ?



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