[Pacemaker] resources not migrating when some are not runnable on one node, maybe because of groups or master/slave clones?

[Andreas Kurz]

On 06/21/2012 11:30 PM, David Vossel wrote:
> ----- Original Message -----
>> From: "Phil Frost" <phil at macprofessionals.com>
>> To: pacemaker at oss.clusterlabs.org
>> Sent: Tuesday, June 19, 2012 4:25:53 PM
>> Subject: Re: [Pacemaker] resources not migrating when some are not runnable on one node, maybe because of groups or
>> master/slave clones?
>>
>> On 06/19/2012 04:31 PM, David Vossel wrote:
>>> Can you attach a crm_report of what happens when you put the two
>>> nodes in standby please?  Being able to see the xml and how the
>>> policy engine evaluates the transitions is helpful.
>>
>> The resulting reports were a bit big for the list, so I put them in a
>> bug report:
>>
>> https://developerbugs.linuxfoundation.org/show_bug.cgi?id=2652
> 
> We're reporting pacemaker issues to bugs.clusterlabs.org now.
> 
> I took a look at the cib in case2 and saw this in the status for storage02.
> 
>       <transient_attributes id="storage02">
>         <instance_attributes id="status-storage02">
>           <nvpair id="status-storage02-probe_complete" name="probe_complete" value="true"/>
>           <nvpair id="status-storage02-master-drbd_nfsexports.1" name="master-drbd_nfsexports:1" value="10"/>
>         </instance_attributes>
>       </transient_attributes>
> 
> storage02 will not give up the drbd master since it has a higher score that storage01.  This coupled with the colocation rule between test and the drbd master, and the location rule to never run "test" on storage02 cause the "test" resource to never run.... "test" has to run with the drbd master, and the drbd master is stuck because of the transient attributes on a node "test" can't run on, so "test" can't start.
> 
> I don't understand why the transient attribute is there, or where it came from yet.

This is added by the RA with the crm_master command. For example the
drbd RA chooses this value from the current state of drbd to let
Pacemaker promote best candidate.

Regards,
Andreas

> 
> 
> -- Vossel
> 
> 
>> I've also found a similar discussion in the archives, though I didn't
>> find much help in it:
>>
>> http://oss.clusterlabs.org/pipermail/pacemaker/2010-November/008189.html
>>
>>
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> 
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