After a period of time experimenting with a cluster composed of 3 physical nodes hosting 5 XEN guests, both physical and virtual nodes being part of their respective cluster, with shared storage based on iSCSI and GFS, I am quite satisfied with the system stability and performances. My concern now is with the management of the startup of the cluster (and possibly also shutdown, imagine an UPS stating that the energy is finished!). When the physical cluster starts up, and the nodes are operational, the virtual nodes are started in an unordered mode, e.g. the allocation to the physical nodes is not predetermined. If the physical cluster nodes come up at different times, the first operational node of the physical cluster tries to bring up all the virtual guests, even if the available memory is not sufficient. This causes some instabilities at system startup, and requires some manual intervention in order to distribute the xen guests among the physical cluster nodes. Is there some way to prevent this kind of behaviour ? Another aspect is related to system shutdown. My system is powered by an UPS, but once in a year due to maintenance on the power supply it may happen that there is need to shutdown the system, or in case of blackout with a long time. How is it possible to completely shutdown the cluster by UPS command ? Thanks, Paolo -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
