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" <[email protected]
<mailto:[email protected]>> 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
<[email protected] <mailto:[email protected]>>:
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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