On 16/06/14 01:36 PM, John R Pierce wrote: > On 6/16/2014 2:39 AM, Alessandro Baggi wrote: >> Hi Digimer, >> there is a chance to make fencing without hardware, but only software? > > the most common fence in TCP connected systems is to disable the > ethernet ports of the fenced system, done via a 'smart ethernet > switch'. if you're using shared fiber storage, then you fence via the > fiber switch. a more extreme fence is to switch off the power to the > fenced system via a 'smart PDU'. Disconnecting a lost node from the network is a process called "Fabric Fencing". It is not the most common, at least not these days. In the past, fencing was done primarily at the fabric switch to disconnect the node from shared storage, however this isn't as common anymore. These days, as you say, you can do something similar by turning down managed switch ports. The main downside to fabric fencing is that the failed node will have no chance of recovering without human intervention. Further, it places the onus on the admin to not simply unfence the node without first doing proper cleanup/recovery. For these reasons, I always recommend power fencing (IPMI, PDUs, etc). digimer -- 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?