[PVE-User] Cluster HA withtou Fence Device !

Gilberto Nunes gilberto.nunes32 at gmail.com
Mon Jul 7 12:59:54 CEST 2014


Well
I am using iSCSI for storage and quorum...
First I tried with 3 nodes plus storage...
I shutdown the node1 where VM was running and the VM restart on node2...






2014-07-07 7:20 GMT-03:00 admin-at-extremeshok-dot-com <
admin at extremeshok.com>:

>  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> 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>:
>>
>>>     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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>>
>
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-- 
Gilberto Ferreira
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