My only addition to the comments by the esteemed gentleman from Virginia is to make sure you have a solid practice in place to manage cluster ID when you go VLAN, as there may be cases when your network people “cross the streams”
From: veritas-ha-boun...@mailman.eng.auburn.edu [mailto:veritas-ha-boun...@mailman.eng.auburn.edu] On Behalf Of Eric Hennessey Sent: Wednesday, September 16, 2009 11:59 AM To: Jon Price; veritas-ha@mailman.eng.auburn.edu Subject: Re: [Veritas-ha] Cluster Interconnect cables: Direct connect orVLANs? The configuration you’re considering – running your cluster interconnects over two separate VLANs – is actually our preferred and recommended method, even when deploying a simple 2-node cluster. While using direct connections between cluster nodes is simple and convenient, it becomes problematic if you decide to add a node to the cluster. Rest easy with your design. :-) Eric From: veritas-ha-boun...@mailman.eng.auburn.edu [mailto:veritas-ha-boun...@mailman.eng.auburn.edu] On Behalf Of Jon Price Sent: Tuesday, September 15, 2009 3:58 PM To: veritas-ha@mailman.eng.auburn.edu Subject: [Veritas-ha] Cluster Interconnect cables: Direct connect or VLANs? Hi, For Veritas Cluster 5.0.... We also have Storage Foundation for Oracle. Currently we use direct connect cables between the two nodes in our Veritas Cluster for the "heartbeat". However, we are switching to new systems and running the direct connect cables is more difficult than it used to be. So, we are considering the use of two VLANs for this purpose. I believe that traffic on these two VLANs is limited to only Cluster heartbeat connections (though not just ours). What is the downside of using VLANs for the heartbeat? In what scenarios could problems develop? I'm concerned that if our network has a serious problem and "goes down" that each Node in the Cluster might be isolated and both Nodes import the disk groups, mount volumes, etc and thus data corruption. Is data corruption a possibility if the entire network goes down or in other scenarios? Does Veritas also use "quorum" or any other methods to protect against split brain induced damage? Thanks
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