[Linux-cluster] Few queries about fence working

[jayesh.shinde]

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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