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[Linux-cluster] cman_tool nodes shows different Inc numbers; should I be concerned?



Hello List Members,

I've just joined, so please forgive me in advance if I break some list etiquette :-)

I have a two node cluster (RHEL5) whereby running "cman_tool nodes" on each node net's the following results:

[root node01 ~]# cman_tool nodes
Node  Sts   Inc   Joined               Name
  1   M    512   2009-01-08 10:59:53  node01.example.com
  2   M    516   2009-01-08 10:59:54  node02.example.com

[root node02 ~]# cman_tool nodes
Node  Sts   Inc   Joined               Name
  1   M    516   2009-01-08 10:59:53  node01.example.com
  2   M    504   2009-01-08 10:35:59  node02.example.com

As you can see the "Inc" numbers are seen as different from both nodes.

First off, should I be concerned that they are different?

And secondly, what is the Inc number signify anyway? The man page for cman_tool doesn't directly describe what an Inc number is for. I think in my travels in trying to answer this question I found a vague reference to the fact that it's something to do with openais, but I wouldn't mind if someone could confirm this and/or hit me over the head with the clue stick.

From manpage for cman_tools:
<snip>
      Example:

In this example we have a five node cluster that has experienced a net- work partition. Here is the output of cman_tool nodes from all systems:
      Node  Sts   Inc   Joined               Name
         1   M   2372   2007-11-05 02:58:55  node-01.example.com
         2   d   2376   2007-11-05 02:58:56  node-02.example.com
         3   d   2376   2007-11-05 02:58:56  node-03.example.com
         4   M   2376   2007-11-05 02:58:56  node-04.example.com
         5   M   2376   2007-11-05 02:58:56  node-05.example.com

      Node  Sts   Inc   Joined               Name
         1   d   2372   2007-11-05 02:58:55  node-01.example.com
         2   M   2376   2007-11-05 02:58:56  node-02.example.com
         3   M   2376   2007-11-05 02:58:56  node-03.example.com
         4   d   2376   2007-11-05 02:58:56  node-04.example.com
         5   d   2376   2007-11-05 02:58:56  node-05.example.com

      Node  Sts   Inc   Joined               Name
         1   d   2372   2007-11-05 02:58:55  node-01.example.com
         2   M   2376   2007-11-05 02:58:56  node-02.example.com
         3   M   2376   2007-11-05 02:58:56  node-03.example.com
         4   d   2376   2007-11-05 02:58:56  node-04.example.com
         5   d   2376   2007-11-05 02:58:56  node-05.example.com

      Node  Sts   Inc   Joined               Name
         1   M   2372   2007-11-05 02:58:55  node-01.example.com
         2   d   2376   2007-11-05 02:58:56  node-02.example.com
         3   d   2376   2007-11-05 02:58:56  node-03.example.com
         4   M   2376   2007-11-05 02:58:56  node-04.example.com
         5   M   2376   2007-11-05 02:58:56  node-05.example.com

      Node  Sts   Inc   Joined               Name
         1   M   2372   2007-11-05 02:58:55  node-01.example.com
         2   d   2376   2007-11-05 02:58:56  node-02.example.com
         3   d   2376   2007-11-05 02:58:56  node-03.example.com
         4   M   2376   2007-11-05 02:58:56  node-04.example.com
         5   M   2376   2007-11-05 02:58:56  node-05.example.com
<snip>

At least in the man page example, node-01 consistently has Inc number 2372, as seen consistently from all nodes.

But as you can see in my cluster, both nodes register a different Inc number for themselves and the other.

Thanks in advance for any information you can provide me regarding this.

Kind Regards,

Stewart


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