Posted by: Preetam | March 11, 2007

Failover Cluster -Longhorn Cluster

I’ve gone through the Webcast : TechNet Webcast: Achieving High Availability with Windows Server “Longhorn” Clustering  (Level 200)

This webcast is actually a introduction to various features of Failover cluster(which was MSCS) and I would say it is worth going for organization who are about to decide if their next generations cluster should be based on Microsoft clustering technology. I’ve sum of what this Next generation technology has to offer.

  • Microsoft Cluster services has been renamed to Failover Clusters, so in effect it means you need to search KB article by this name going forward.
  • DHCP Support for all IPAddress on failover cluster nodes
  • Nodes can added in one go, rather validation cluster node one at a time and joining nodes one by one. However new nodes can be added later on.
  • Cluster Prep 2.0 tool which is now available will be integrated with Longhorn cluster installation
  • Cluster by default is not installed in Longhorn, as was the case with Windows 2003
  • Management of cluster node is made truly neat,easy using MMC 3.0, this brings it’s own advantage, you can see multiple clusters in your organizations, make changes from one console on multiple clusters.
  • In the same MMC, you would see cluster trace logs, no need to depend upon cluster.log file for diagnosis.
  • Migration tool from migrating exiting clusters to Failover clusters
  • As longhorn would be all Task-Based, same by default applies to failover clusters.
  • No cluster service account,Cluster service account would run under context of local system account. No password management hassles, No Pre-staged accounts,
  • Support for GPT disk is included and 2 TB LUN is now supported
  • With 64-Bit edition you can scale up node nos up to 16
  • You would no longer refer to Quoroum disk as Quroum disk, it is called Witness disk, Majority Quorum model is changed, which can allow cluster to work even if Witness disk goes down (details need to be checked) similiarly file share resources are called file share witness
  • Cluster.exe would be still used to manage failover clusters but same cluster.exe will not be able to manage Pre-Failover clusters and vice-versa

But it would be good idea to spend some time at least going through PPT of this Webcast.



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