[Linux-cluster] DR node in a cluster

[Jankowski, Chris]

Paras,

With your SAN on one site, what is the point of having a stretched cluster?
If your datacenter, where the SAN is located, burns down, you've lost all your data.
The DR servers in the DR datacenter are kind of useless without the data on shared storage.

Regards,

Chris


From: linux-cluster-bounces at redhat.com [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Paras pradhan
Sent: Thursday, 7 July 2011 03:17
To: linux clustering
Subject: 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 at hp.com<mailto:Chris.Jankowski at 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 at redhat.com<mailto:linux-cluster-bounces at redhat.com> [mailto:linux-cluster-bounces at redhat.com<mailto:linux-cluster-bounces at 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 name: vrprd1.hostmy.com<http://vrprd1.hostmy.com>
Node ID: 2
Multicast addresses: x.x.x.244
Node addresses: x.x.x.96
--

Thanks!
Paras.


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