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! >