[Pacemaker] weird drbd/cluster behaviour

Andrew Beekhof andrew at beekhof.net
Fri Jun 28 01:21:30 UTC 2013 

On 27/06/2013, at 2:21 AM, Саша Александров <shurrman at gmail.com> wrote:

> Hi!
> 
> Fencing is disabled for now, the issue is not with fencing: the question is - why only one out of three DRBD master-slave sets is recognized by pacemaker,

Pacemaker knows nothing of drbd or any other kind of service.
All that knowledge is encapsulated in the resource agent, so thats where I'd start looking.

Maybe someone from linbit can chime in, since its their agent :)

> even though all three drbd resources are active and configured properly...
> 
> 
> 2013/6/26 Digimer <lists at alteeve.ca>
> I don't see fencing/stonith configured. Without it, your cluster will
> not be stable. You will get DRBD split-brains easily and depending in
> what you use DRBD for, you could corrupt your data.
> 
> On 06/25/2013 09:25 AM, Саша Александров wrote:
> > Hi all!
> >
> > I am setting up a new cluster on OracleLinux 6.4 (well, it is CentOS 6.4).
> > I went through http://clusterlabs.org/quickstart-redhat.html
> > Then I installed DRBD 8.4.2 from elrepo.
> > This setup is unusable :-( with DRBD 8.4.2.
> > I created three DRBD resources:
> >
> > cat /proc/drbd
> > version: 8.4.2 (api:1/proto:86-101)
> > GIT-hash: 7ad5f850d711223713d6dcadc3dd48860321070c build by
> > root at flashfon1, 2013-06-24 22:08:41
> >  0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
> >     ns:97659171 nr:0 dw:36 dr:97660193 al:1 bm:5961 lo:0 pe:0 ua:0 ap:0
> > ep:1 wo:f oos:0
> >  1: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
> >     ns:292421653 nr:16 dw:16 dr:292422318 al:0 bm:17848 lo:0 pe:0 ua:0
> > ap:0 ep:1 wo:f oos:0
> >  2: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
> >     ns:292421600 nr:8 dw:8 dr:292422265 al:0 bm:17848 lo:0 pe:0 ua:0
> > ap:0 ep:1 wo:f oos:0
> >
> > It appeared that drbd resource-agent script did not work. Debugging
> > showed that check_crm_feature_set() function always returned zeroes. Ok,
> > just added 'exit' as its first line for now.
> >
> > Next, I created three drbd resources in pacemaker, three master-slave
> > sets, three filesystem resources (and ip resources, but they are no
> > problem):
> >
> >  pcs status
> > Last updated: Tue Jun 25 21:20:17 2013
> > Last change: Tue Jun 25 02:46:25 2013 via crm_resource on flashfon1
> > Stack: cman
> > Current DC: flashfon1 - partition with quorum
> > Version: 1.1.8-7.el6-394e906
> > 2 Nodes configured, unknown expected votes
> > 11 Resources configured.
> >
> >
> > Online: [ flashfon1 flashfon2 ]
> >
> > Full list of resources:
> >
> >  Master/Slave Set: ms_wsoft [drbd_wsoft]
> >      Masters: [ flashfon1 ]
> >      Slaves: [ flashfon2 ]
> >  Master/Slave Set: ms_oradata [drbd_oradata]
> >      Slaves: [ flashfon1 flashfon2 ]
> >  Master/Slave Set: ms_flash [drbd_flash]
> >      Slaves: [ flashfon1 flashfon2 ]
> >  Resource Group: WcsGroup
> >      wcs_vip_local      (ocf::heartbeat:IPaddr2):       Started flashfon1
> >      wcs_fs     (ocf::heartbeat:Filesystem):    Started flashfon1
> >  Resource Group: OraGroup
> >      ora_vip_local      (ocf::heartbeat:IPaddr2):       Started flashfon1
> >      oradata_fs (ocf::heartbeat:Filesystem):    Stopped
> >      oraflash_fs        (ocf::heartbeat:Filesystem):    Stopped
> >
> > See, only one master-slave set is recognizing DRBD state!
> >
> > Resources are configured identically in CIB (except for drbd resource
> > name parameter):
> >
> >       <master id="ms_wsoft">
> >         <primitive class="ocf" id="drbd_wsoft" provider="linbit"
> > type="drbd">
> >           <instance_attributes id="drbd_wsoft-instance_attributes">
> >             <nvpair id="drbd_wsoft-instance_attributes-drbd_resource"
> > name="drbd_resource" value="wsoft"/>
> >           </instance_attributes>
> >           <operations>
> >             <op id="drbd_wsoft-interval-60s" interval="60s" name="monitor"/>
> >           </operations>
> >         </primitive>
> >         <meta_attributes id="ms_wsoft-meta_attributes">
> >           <nvpair id="ms_wsoft-meta_attributes-master-max"
> > name="master-max" value="1"/>
> >           <nvpair id="ms_wsoft-meta_attributes-master-node-max"
> > name="master-node-max" value="1"/>
> >           <nvpair id="ms_wsoft-meta_attributes-clone-max"
> > name="clone-max" value="2"/>
> >           <nvpair id="ms_wsoft-meta_attributes-clone-node-max"
> > name="clone-node-max" value="1"/>
> >           <nvpair id="ms_wsoft-meta_attributes-notify" name="notify"
> > value="true"/>
> >         </meta_attributes>
> >       </master>
> >       <master id="ms_oradata">
> >         <primitive class="ocf" id="drbd_oradata" provider="linbit"
> > type="drbd">
> >           <instance_attributes id="drbd_oradata-instance_attributes">
> >             <nvpair id="drbd_oradata-instance_attributes-drbd_resource"
> > name="drbd_resource" value="oradata"/>
> >           </instance_attributes>
> >           <operations>
> >             <op id="drbd_oradata-interval-60s" interval="60s"
> > name="monitor"/>
> >           </operations>
> >         </primitive>
> >         <meta_attributes id="ms_oradata-meta_attributes">
> >           <nvpair id="ms_oradata-meta_attributes-master-max"
> > name="master-max" value="1"/>
> >           <nvpair id="ms_oradata-meta_attributes-master-node-max"
> > name="master-node-max" value="1"/>
> >           <nvpair id="ms_oradata-meta_attributes-clone-max"
> > name="clone-max" value="2"/>
> >           <nvpair id="ms_oradata-meta_attributes-clone-node-max"
> > name="clone-node-max" value="1"/>
> >           <nvpair id="ms_oradata-meta_attributes-notify" name="notify"
> > value="true"/>
> >         </meta_attributes>
> >       </master>
> >
> > I am stuck. :-((((
> >
> > Best regards,
> > Alexandr A. Alexandrov
> >
> >
> > _______________________________________________
> > 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
> >
> 
> 
> --
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
> 
> 
> 
> -- 
> С уважением, ААА.
> _______________________________________________
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> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
> 
> Project Home: http://www.clusterlabs.org
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