May 20, 2011

Sun Cluster 3.2 experiment: boot two nodes without quorum device

Posted in Sun Cluster at 2:51 pm by alessiodini

Recently i did some experiment on my vmware toy-cluster where i have:

– two cluster nodes ( Solaris 10 – Sun Cluster 3.2u3 )
– quorum server on third system

I tried to boot both nodes with quorum server offline. In order i saw:

1) node1 tries to boot and he waits another node for form the cluster ( it’s ok cos the requirement to form/maintain a cluster is to have more than 50% of possible votes )

2) node2 joins the cluster ( in this moment the cluster haves 2 votes , more than 50% ). After some second both nodes panic because they lost quorum device. This was unexpectedly for me.

Thinking to this i worked a couple of days ago to a customer with similar scenario. They physically moved 12 systems from one location to another. We had Sun Cluster 3.0 , Solaris 8 and VxVM 3.2. On of three cluster booted up without any quorum device, and other 2 cluster were not able to do this.

My questions here are:

1) Why on my laptop both nodes panic during the boot? I think this is due to prevent something like amnesia.
2) Why 2 days ago i saw an older Sun Cluster that booted up in same scenario correctly?

>_<

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2 Comments »

  1. Hi Alessiodini,
    If More than two node cluster configured, then it doesn’t need the quorum device since with it has given more than 50% of possible votes… but in real world I always using quorum device although it configured with 2 more nodes cluster.

    • alessiodini said,

      Hi šŸ™‚
      I agree with you but i saw some cluster that was not able to boot without quorum device.
      I’m still asking to myself why šŸ˜‰


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