[PVE-User] Cluster HA withtou Fence Device !

admin-at-extremeshok-dot-com admin at extremeshok.com
Mon Jul 7 12:20:13 CEST 2014


Assuming he is using shared storage (NAS)...

The nas operates as a 3rd node, and the systems are fenced via the NAS.

As long as 1 node can communicate with the NAS, it will have a higher 
quorum, than the node that cant connect to the NAS.

Single point of failure is NAS, so its not HA.

On 7/7/2014 11:50 AM, Yannis Milios wrote:
>
> I tried the same config on a lab but does not work.
> I think its not possible to have HA without proper fencing.
> Im
>
> On Jul 7, 2014 12:40 PM, "Angel Docampo" <adocampo at dltec.net 
> <mailto:adocampo at dltec.net>> wrote:
>
>     What do you mean by "it works"?
>     Without fence mechanism, the cluster won't be aware there a node
>     down, and then you can continue writing modifications in both
>     sides and finish with a split brain.
>
>
>
>     El 05/07/14 21:49, Gilberto Nunes escribió:
>>     WOW
>>
>>     Even with just 2 nodes HA works fine!!!!
>>
>>     I have tested some minutes ago...
>>
>>     Is there something improvement on HA Code??
>>
>>     I would like to know...
>>
>>     Thanks
>>
>>
>>     2014-07-05 16:37 GMT-03:00 Gilberto Nunes
>>     <gilberto.nunes32 at gmail.com <mailto:gilberto.nunes32 at gmail.com>>:
>>
>>         Hi
>>
>>         Today I have deploy a tree node plus storage scenario in a lab.
>>         First at all, I image that I need configure fence device, as
>>         docs demand...
>>         So, I decide to use a MAnaged Switch (DLikn DES-3028).
>>         But, I realize that even without fence configuratio HA works
>>         properly and NICE, I might add..
>>
>>         Here's the configuration:
>>
>>         <?xml version="1.0"?>
>>         <cluster config_version="18" name="CLUSTER">
>>           <cman expected_votes="3"
>>         keyfile="/var/lib/pve-cluster/corosync.authkey"/>
>>            <quorumd allow_kill="0" interval="3" label="quorum"
>>         tko="10" votes="1">
>>            <heuristic interval="3" program="ping 10.90.90.100 -c1
>>         -w1" score="1" tko="4"/>
>>            <heuristic interval="3" program="ip addr | grep eth0 |
>>         grep -q UP" score="2" tko="3"/>
>>          </quorumd>
>>          <totem token="54000"/>
>>           <clusternodes>
>>             <clusternode name="pve01" nodeid="1" votes="1">
>>             </clusternode>
>>             <clusternode name="pve02" nodeid="2" votes="1">
>>             </clusternode>
>>             <clusternode name="pve03" nodeid="3" votes="1">
>>             </clusternode>
>>           </clusternodes>
>>           <rm>
>>            <failoverdomains>
>>              <failoverdomain name="serverfailover" ordered="1"
>>         restricted="0">
>>                <failoverdomainnode name="pve1" priority="1"/>
>>                <failoverdomainnode name="pve2" priority="2"/>
>>                <failoverdomainnode name="pve3" priority="3"/>
>>              </failoverdomain>
>>            </failoverdomains>
>>             <pvevm autostart="1" vmid="100"/>
>>           </rm>
>>         </cluster>
>>
>>
>>         I always though that I need fence device in order to make HA
>>         work...
>>
>>         Thanks
>>
>>         -- 
>>         Gilberto Ferreira
>>
>>
>>
>>
>>     -- 
>>     Gilberto Ferreira
>>
>>
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>
>     -- 
>
>
>     	
>     *Angel Docampo
>     *
>     *Datalab Tecnologia, s.a.*
>     Castillejos, 352 - 08025 Barcelona
>     Tel. 93 476 69 14 - Ext: 706
>     Mob. 670.299.381
>
>
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