No. For fencing to be worthwhile, it *must* work when the node is in any state. For this, it must be independent of node. A great way to see why is to test crashing the node (echo c > /proc/sysrq-trigger) or simply cutting the power to the node. With the node totally disabled, the surviving peer will fail to fence and, not being allowed to make assumptions, block. On 16/06/14 05:39 AM, Alessandro Baggi wrote: > Hi Digimer, > there is a chance to make fencing without hardware, but only software? > > > Il 15/06/2014 17:28, Digimer ha scritto: >> 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! >> > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- 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?