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Re: [Linux-cluster] linux-cluster



This talks about how manual fencing isn't actual fencing;

https://fedorahosted.org/cluster/wiki/Fence

There was a page where it was said that manual fencing was in no way supported, but I can't find it at the moment.

The reason it is not safe is that an admin is likely to issue it in a panic while trying to get a hung cluster back online. If this happens without first ensuring the peer node(s) is fenced, you can walk into a split-brain.

digimer

On 10/02/2012 09:43 AM, Parvez Shaikh wrote:
Hi Digimer,

Could you please give me reference/case studies of problem about why
manual fencing was dropped and how automated fencing is fixing those?

Thanks,
Parvez

On Tue, Oct 2, 2012 at 7:08 PM, Digimer <lists alteeve ca
<mailto:lists alteeve ca>> wrote:

    On 10/02/2012 04:00 AM, Parvez Shaikh wrote:

        What kind of cluster is this - an academic project or production
        quality
        solution?

        If its former - go for manual fencing. You wont need fence
        device but
        failover wont be automatic


    *Please* don't do this. Manual fencing support was dropped for a
    reason. It's *far* too easy to mess things up when an admin uses it
    before identifying a problem.


        If its later - yes you'll need fence device


    This is the only sane option; Academic or production. Fencing is an
    integral part of the cluster and you do yourself no favour by not
    learning it in an academic setup.


    --
    Digimer
    Papers and Projects: https://alteeve.ca
    "Hydrogen is just a colourless, odourless gas which, if left alone
    in sufficient quantities for long periods of time, begins to think
    about itself."




--
Digimer
Papers and Projects: https://alteeve.ca
"Hydrogen is just a colourless, odorless gas which, if left alone in sufficient quantities for long periods of time, begins to think about itself."


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