Red Hat Cluster and fence problem
I have two nodes with Red Hat Cluster Suite, when I shutdown one of the two nodes (use the command shutdown -h now) the cluster balancing for the other node correctly.
But when I disconnect the network wire, cluster dont balancing to the other node.
Do I have to use a fence?
I dont configure a fence for the cluster, because I dont have any device for fencing. Is it necessary for the correct balancing?
I have seen that there is a manual option for the fence, working properly and it's automatic?
A 'true' cluster has an uneven amount of nodes (3,5,7 etc). If you want to set up a cluster with an even amount of nodes you do need a quorum disk. This is needed because otherwise it is not possible to find out the bad node(s) and a split brain situation can also arise.
True fencing is a hardware solution that can power-off one (or more) nodes if needed to protect the integrity of the data.
The manual fencing is there to provide a test environment. It is _not_ automatic (and it cannot be) and not meant to be used in production environments. Manual fencing will print a message in the log that something is wrong and a human has to take the appropriate action(s).
Here are 2 URL's that could be of interest:
Red Hat Cluster Suite
Red Hat Cluster FAQ
Hope this clears things up a bit.
Hi I was going through the posted thread I found it relevant to me.
My query is what method should I use for implement 3 cluster nodes should I use quorum disk for quorum votes because reason is i have 3 nodes cluster configured with HP ILO fence device and dlm as locking machnism sometimes it cluster service got crash when i execute clustat it says cluster is not quorate.
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