[Linux-cluster] linux-cluster

[Digimer]

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 at alteeve.ca
> <mailto:lists at 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."