[Pacemaker] Fixed! - Re: Problem with dual-PDU fencing node with redundant PSUs

[Andrew Beekhof]

On 28/06/2013, at 5:22 PM, Lars Marowsky-Bree <lmb at suse.com> wrote:

> On 2013-06-27T12:53:01, Digimer <lists at alteeve.ca> wrote:
> 
>> primitive fence_n01_psu1_off stonith:fence_apc_snmp \
>>        params ipaddr="an-p01" pcmk_reboot_action="off" port="1"
>> pcmk_host_list="an-c03n01.alteeve.ca"
>> primitive fence_n01_psu1_on stonith:fence_apc_snmp \
>>        params ipaddr="an-p01" pcmk_reboot_action="on" port="1"
>> pcmk_host_list="an-c03n01.alteeve.ca"
> 
> So every device twice, including location constraints? I see potential
> for optimization by improving how the fence code handles this ... That's
> abhorrently complex. (And I'm not sure the 'action' parameter ought to
> be overwritten.)

I'm not crazy about it either because it means the device is tied to a specific command.
But it seems to be something all the RHCS people try to do...

> 
> Glad you got it working, though.
> 
>> location loc_fence_n01_ipmi fence_n01_ipmi -inf: an-c03n01.alteeve.ca
> [...]
> 
> I'm not sure you need any of these location constraints, by the way. Did
> you test if it works without them?
> 
>> Again, this is after just one test. I will want to test it several more
>> times before I consider it reliable. Ideally, I would love to hear
>> Andrew or others confirm this looks sane/correct.
> 
> It looks correct, but not quite sane. ;-) That seems not to be
> something you can address, though. I'm thinking that fencing topology
> should be smart enough to, if multiple fencing devices are specified, to
> know how to expand them to "first all off (if off fails anywhere, it's a
> failure), then all on (if on fails, it is not a failure)". That'd
> greatly simplify the syntax.

The RH agents have apparently already been updated to support multiple ports.
I'm really not keen on having the stonith-ng doing this.

> 
> Can you file a bugzilla/enhancement suggestion for that?
> 
>> The crm commands used to configure this were (edited, may contain typos):
> 
> BTW, for the crm shell, you don't need to provide these in addition to
> the configuration syntax you already pasted above, since that's a
> complete rendering of the commands needed to recreate the configuration
> already.
> 
> 
> Regards,
>    Lars
> 
> -- 
> Architect Storage/HA
> SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg)
> "Experience is the name everyone gives to their mistakes." -- Oscar Wilde
> 
> 
> _______________________________________________
> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> 
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://bugs.clusterlabs.org