[PVE-User] Cluster HA withtou Fence Device !

Gilberto Nunes gilberto.nunes32 at gmail.com
Mon Jul 7 19:01:31 CEST 2014


Well.... Is just a simple ubuntu server with TGT installed...
I follow this website:
http://www.cyberciti.biz/tips/howto-setup-linux-iscsi-target-sanwith-tgt.html


2014-07-07 13:57 GMT-03:00 Jean R. Franco <jfranco at maila.net.br>:

> Hi Gilberto,
>
> What is the iSCSI solution you´re using?
>
> Thanks,
>
> ------------------------------
> *De: *"Gilberto Nunes" <gilberto.nunes32 at gmail.com>
> *Para: *"admin-at-extremeshok-dot-com" <admin at extremeshok.com>,
> pve-user at pve.proxmox.com
> *Enviadas: *Segunda-feira, 7 de julho de 2014 7:59:54
> *Assunto: *Re: [PVE-User] Cluster HA withtou Fence Device !
>
>
> 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
>>>
>>>
>>> _______________________________________________
>>> pve-user mailing listpve-user at pve.proxmox.comhttp://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
>>>
>>>
>>> --
>>>
>>>
>>>
>>> *Angel Docampo *
>>> *Datalab Tecnologia, s.a.*
>>> Castillejos, 352 - 08025 Barcelona
>>> Tel. 93 476 69 14 - Ext: 706
>>> Mob. 670.299.381
>>>
>>> _______________________________________________
>>> pve-user mailing list
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>>>
>>>
>>
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>
>
> --
> Gilberto Ferreira
>
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>


-- 
Gilberto Ferreira
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