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Re: [Linux-cluster] DR node in a cluster



Chris,

All the nodes are connected to a single SAN at this moment through fibre.


@steven:

--
 If you don't have enough nodes at a site to allow quorum to be
established, then when communication fails between sites you must fence
those nodes or risk data corruption when communication is
re-established,
-----

Yes true, but in this case a single node can made the cluster quorate. (qdisk vote=3 ,node votes=3, total=6) which is not recommened I guess (?).


Steve


On Wed, Jul 6, 2011 at 11:46 AM, Jankowski, Chris <Chris Jankowski hp com> wrote:

Paras,

 

A curiosity question:

 

How do you make sure that your storage will survive failure of *either* of your site without loss of data and continuity of service?

What storage configuration are you using?

 

Thanks and regards,


Chris

 

From: linux-cluster-bounces redhat com [mailto:linux-cluster-bounces redhat com] On Behalf Of Paras pradhan
Sent: Thursday, 7 July 2011 02:15
To: linux clustering
Subject: [Linux-cluster] DR node in a cluster

 

Hi,

 

My GFS2 linux cluster has three nodes. Two at the data center and one at the DR site. If the nodes at DR site break/turnoff, all the services move to DR node. But if the 2 nodes at the data center lost communication with the DR node, I am not sure how does the cluster handles the split brain. So I am looking for some recommendation in this kind of scenario. I am usig Qdisk votes (=3) in this case.

 

--

Here is the cman_tool status output.

 

 

-

Version: 6.2.0

Config Version: 74

Cluster Name: vrprd

Cluster Id: 3304

Cluster Member: Yes

Cluster Generation: 1720

Membership state: Cluster-Member

Nodes: 3

Expected votes: 6

Quorum device votes: 3

Total votes: 6

Quorum: 4  

Active subsystems: 10

Flags: Dirty 

Ports Bound: 0 11 177  

Node ID: 2

Multicast addresses: x.x.x.244 

Node addresses: x.x.x.96 

--

 

Thanks!

Paras.

 


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