[Pacemaker] Problem setting-up DRBD v8,4 with Pacemaker v1.1.6

Andreas Kurz andreas at hastexo.com
Wed Jul 4 20:52:37 UTC 2012


On 07/04/2012 09:16 PM, Irfan Ali wrote:
> Hi all,
> 
> We are trying to set-up an HA pair  on RHEL 6.2 using DRBD (v
> 8.4.1-2), Pacemaker (v 1.1.6-3) and Corosync (v 1.4.1-4). We could
> make DRBD work independently syncing the two machines of the pair. But
> our problem begins when we try to connect DRBD with Pacemaker. Even
> though Pacemaker was able to detect the resources corresponding to
> DRBD running on both the machines, it does not promoted any one of
> them as master. I have pasted the output from 'crm status' below, it
> shows that the resource 'ms-drbd' is running as slaves on both the
> machines of our HA pair.

Please, don't paste snippets ... only full configurations are useful ...
more inline

> 
> We fiddled a lot with the configuration for both Pacemaker and DRBD,
> but couldn't find anything to fix this problem. Any help / suggestions
> from you guys will be highly appreciated.
> 
> ===========================================================================================================
> 
> [root at c713 linbit]# crm status
> 
> ============
> 
> Last updated: Wed Jul  4 08:42:37 2012
> 
> Last change: Wed Jul  4 07:34:53 2012 via crm_resource on c710.siemlab.com
> 
> Stack: openais
> 
> Current DC: c710.siemlab.com - partition with quorum
> 
> Version: 1.1.6-3.el6-a02c0f19a00c1eb2527ad38f146ebc0834814558
> 
> 2 Nodes configured, 2 expected votes
> 
> 14 Resources configured.
> 
> ============
> 
> 
> 
> Online: [ c713.siemlab.com c710.siemlab.com ]
> 
> 
> 
> Clone Set: connectivity [ping]
> 
>      Started: [ c710.siemlab.com c713.siemlab.com ]

What is the drbd state in /proc/drbd? everything ok?

> 
> Clone Set: powerstatus [cpps0]
> 
>      Started: [ c710.siemlab.com c713.siemlab.com ]
> 
> Master/Slave Set: ms-drbd [drbd0]
> 
>      Slaves: [ c710.siemlab.com c713.siemlab.com ]
> 
> c713.siemlab.com-stonith       (stonith:fence_ipmilan):        Started
> c710.siemlab.com
> 
> c710.siemlab.com-stonith       (stonith:fence_ipmilan):        Started
> c713.siemlab.com
> 
> 
> 
> ===========================================================================================================
> 
> We are using the following CIB configuration related to DRBD:
> 
> <master id="ms-drbd">
> 
>         <meta_attributes id="ma-ms-drbd">
> 
>           <nvpair id="ma-ms-drbd-1" name="clone-max" value="2"/>
> 
>           <nvpair id="ma-ms-drbd-2" name="clone-node-max" value="1"/>
> 
>           <nvpair id="ma-ms-drbd-3" name="notify" value="yes"/>
> 
>           <nvpair id="ma-ms-drbd-4" name="globally-unique" value="false"/>
> 
>           <nvpair id="ma-ms-drbd-5" name="master-max" value="1"/>
> 
>           <nvpair id="ma-ms-drbd-6" name="master-node-max" value="1"/>
> 
>           <nvpair id="ma-ms-drbd-7" name="target-role" value="Master"/>
> 
>           <nvpair id="ma-ms-drbd-8" name="ordered" value="true"/>

remove that "ordered" attribute

> 
>           <nvpair id="ma-ms-drbd-crm-feature-set"
> name="crm-feature-set" value="3.0.5"/>
> 
>           <nvpair id="ma-ms-drbd-is-managed" name="is-managed" value="true"/>
> 
>         </meta_attributes>
> 
>         <primitive class="ocf" id="drbd0" provider="linbit" type="drbd">
> 
>           <instance_attributes id="ia-drbd">
> 
>             <nvpair id="ia-drbd-1" name="drbd_resource" value="var_nsm"/>
> 
>           </instance_attributes>
> 
>           <operations>
> 
>             <op id="op-drbd-1" interval="2min" name="monitor"
> role="Master" timeout="5min"/>
> 
>             <op id="op-drbd-2" interval="0" name="start" role="Master"
> timeout="4min"/>
> 
>             <op id="op-drbd-3" interval="0" name="stop" role="Master"
> timeout="4min"/>

you don't need roles for star/stop operations

> 
>           <op id="op-drbd-4" interval="3min" name="monitor"
> role="Slave" timeout="6min"/>
> 
>             <op id="op-drbd-5" interval="0" name="start" role="Slave"
> timeout="4min"/>
> 
>             <op id="op-drbd-6" interval="0" name="stop" role="Slave"
> timeout="4min"/>
> 
>           </operations>
> 
>         </primitive>
> 
>  </master>
> 
> ===========================================================================================================
> 
> The following is the content of drbd.conf:
> 
> global {
> 
>         usage-count no;
> 
> }
> 
> common {
> 
>                 net {
> 
>                                 protocol C;
> 
>                 }
> 
>       startup {
> 
>                 wfc-timeout 120;
> 
>                 degr-wfc-timeout 120;
> 
>       }
> 
> }
> 
> resource var_nsm {
> 
>                                 disk {
> 
>                                                 on-io-error detach;
> 
>                                                 no-disk-barrier;
> 
>                                                 no-disk-flushes;
> 
>                                                 fencing resource-only;
> 
>                                 }
> 
>                                 handlers {
> 
>                                                 fence-peer
> "/usr/lib/drbd/crm-fence-peer.sh";
> 
>                                                 after-resync-target
> "/usr/lib/drbd/crm-unfence-peer.sh";
> 
>                                 }
> 
>                                 net {
> 
>                                                 #rate 333M;
> 
>                                                 after-sb-1pri discard-secondary;

... you know that can discard valid data?


Regards,
Andreas

-- 
Need help with Pacemaker?
http://www.hastexo.com/now


> 
>                                                 max-buffers 8000;
> 
>                                                 max-epoch-size 8000;
> 
>                                                 sndbuf-size 0;
> 
>                                 }
> 
>                                 on c713.siemlab.com {
> 
>                 device /dev/drbd1;
> 
>          disk /dev/sdb3;
> 
>          address 192.168.2.2:7791;
> 
>          meta-disk internal;
> 
>       }
> 
>       on c710.siemlab.com {
> 
>                 device /dev/drbd1;
> 
>          disk /dev/sdb3;
> 
>          address 192.168.2.4:7791;
> 
>          meta-disk internal;
> 
>                                 }
> 
> }
> 
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> 
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