What is the best two-node network & fencing configuration?
In a two node cluster (where you are using two_node=”1″ in the cluster configuration, and w/o QDisk), there are several considerations you need to be aware of: If you are using per-node power management of any sort where the device is not shared between cluster nodes, it must be connected to the same network used by CMAN for cluster communication. Failure to do so can result in both nodes simultaneously fencing each other, leaving the entire cluster dead, or end up in a fence loop. Typically, this includes all integrated power management solutions (iLO, IPMI, RSA, ERA, IBM Blade Center, Egenera Blade Frame, Dell DRAC, etc.), but also includes remote power switches (APC, WTI) if the devices are not shared between the two nodes. It is best to use power-type fencing. SAN or SCSI-reservation fencing might work, as long as it meets the above requirements. If it does not, you should consider using a quorum disk or partition If you can not meet the above requirements, you can use quorum disk
