[Pacemaker] Help with N+1 configuration

[Andrew Beekhof]

On Sat, Jul 28, 2012 at 4:00 AM, Cal Heldenbrand <cal at fbsdata.com> wrote:
> Would you be able to direct me to some documentation for configuring STONITH
> based on my environment?  The Clusters from Scratch document talks about a
> fence_ipmilan driver, which I seem to not have on my centos 6 install.   I
> only show the fence_pcmk driver.

You probably want the fence-agents package.
fence_pcmk is just some glue for people using cman.

> Reading the metadata for fence_pcmk, I don't quite understand how it should
> be configured.
>
> Thanks!
>
> --Cal
>
>
> On Fri, Jul 27, 2012 at 10:56 AM, Phil Frost <phil at macprofessionals.com>
> wrote:
>>
>> On 07/27/2012 11:48 AM, Cal Heldenbrand wrote:
>>>
>>> Why wouldn't my mem3 failover happen if it timed out stopping the cluster
>>> IP?
>>
>>
>> If a stop action fails, pacemaker can't know if the resource is running,
>> not running, or in some other broken state. The cluster is in an unknown
>> state, and there's no reasonable thing pacemaker can do. Since pacemaker
>> thinks a node is broken (it failed to stop a resource, as requested) but
>> isn't sure, the solution is to transition to a known state by powering the
>> node off, resetting it, or otherwise fencing it. Configure a STONITH
>> resource to do this. Without STONITH, your only option is to manually
>> address the cause of the failure (high load, in this case), then issue "crm
>> resource cleanup ..." on any failed resources to instruct pacemaker that it
>> is safe to try again.
>>
>
>
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