On 15/06/14 08:54 AM, Alessandro Baggi wrote: > Another question is about fencing. I've ridden that a cluster must have > fencing to be considered as such. On CentOS 6.5 there is stonith that > concerns node level fencing. For this type of fencing I must have ilo, > ilom, drac, and other. It's possible to have fencing without Light-out > devices, blade power control device and other? There are other device > that can be used for fencing? Supposing a 2 node cluster with two server > assembled (no hp, dell, sun, ibm..) how I can implement fencing with > stonith? I can run a cluster without fencing and what implies do not use > fencing? A lot of odd problems go away once fencing is working. So this is a good time to sort this out, then go back and see if your problems remain. A very good way to fence machines without IPMI (etc) is to use an external switched PDU, like the APC AP7900 (or your country version on). http://www.apc.com/resource/include/techspec_index.cfm?base_sku=ap7900 If your budget is tight, I have seen these models frequently go on sale for ~$200 (Canadian). These work be allowing another node to log into the PDU and turn off the power going to the lost/failed node. Please do note that the brand of switched PDU you buy matters. For a device to work for fencing, it must be possible for the cluster to talk to it. This is done using a "fence handler", and there are many types that are supported (APC, Eaton, etc). So if you want to get a different make/model, please first make sure there is a fence handler. Once you get this setup, see if your problems remain. If so, there is a good clustering mailing list at: https://www.redhat.com/mailman/listinfo/linux-cluster And if you're on freenode, #linux-cluster is also very good. Cheers! -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?