Few queries about fence working

"jayesh.shinde" <jayesh.shinde@xxxxxxxxxxxxx> · Wed, 25 Jan 2012 13:20:32 +0530



    Hi  all , 

      
      I have few queries about fence working. 

      
      I am using 2 different  the 2 node cluster with Dell and IBM
      hardware in two different IDC.

      Recently I came across the network failure problem at different
      time and I found my 2 nodes are power off state.

      
      Below is  how the situation happened with my 2 different 2 node
      cluster. 

      
      With 2 node 
      IBM  node
      cluster with SAN :--

      ==============================

      1)  Network connectivity  was failed totally for few minutes. 

      2) And as per the /var/log/messages both servers failed to  fence
      to each other and both server was UP as it is with all services. 

      3) But the "clustat" was showing serves are not in cluster mode
      and "regmanger" status was stop.

      4) I simply reboot the server. 

      5) After that I found both server in power off stat. 

      
      with another  2 node Dell server with DRBD  :--

      =================================

      1) Network
      connectivity  was failed totally. 

      2) DRAC ip was unavailable so fence failed from both server. 

      3) after some time I fond the servers are shutdown.

    
      In normal conditions both cluster work properly 

      
     my queries are
      now :--

       ===============

      1) What could be the reason for power off ? 

      2) Does cluster's fencing method  caused for the power off  of
      server ( i.e because of previous failed fence ) ?

      3) Is there any test cases mentioned on net / blog / wiki  about
      the fence , i.e different situation under which  fence works.

      
      Please guide. 

      
      Thanks & Regards

      Jayesh Shinde

      
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