[ClusterLabs] corosync-cfgtool -sb. What is the "n" indicating?

[Dr. Volker Jaenisch]

Hi Corosync Specialists!

I have a production cluster with two nodes (node0/1). And I have setup
for debugging this issue a completely virtual cluster also.

Both are showing the same pattern that I do not understand:

Printing link status.

Local node ID 0
LINK ID 0
    addr    = 192.168.2.132
    status    = 33
LINK ID 1
    addr    = 192.168.1.132
    status    = *n*3

What is this "n" indicating? The "n" occurs always at the second ring,
independent of the odering of the interfaces, oder the ring/IP
association, or the interface states.

Without the -b switch the status becomes even more unclear.

Printing link status.
Local node ID 0
LINK ID 0
    addr    = 192.168.2.132
    status:
        node  0:    link enabled:1    link connected:1
        node  1:    link enabled:1    link connected:1
LINK ID 1
    addr    = 192.168.1.132
    status:
        node  0:    link enabled:0    link connected:1
        node  1:    link enabled:1    link connected:1

What is an "enabled" vs. an "connected" link? At first I thought about
something like spanning tree, where some interfaces are deliberately are
shut down to prevent circles. But this does not correlate with my
findings when I disabled interfaces.

If I disable the interface 192.168.2.132 on Node0 I get on Node0

Local node ID 0
LINK ID 0
    addr    = 192.168.2.132
    status:
        node  0:    link enabled:1    link connected:1
        node  1:    link enabled:1    link connected:0
LINK ID 1
    addr    = 192.168.1.132
    status:
        node  0:    link enabled:0    link connected:1
        node  1:    link enabled:1    link connected:1

while I get on node1

Printing link status.
Local node ID 1
LINK ID 0
    addr    = 192.168.2.134
    status:
        node 0:    link enabled:1    link connected:0
        node 1:    link enabled:1    link connected:1
LINK ID 1
    addr    = 192.168.1.134
    status:
        node 0:    link enabled:1    link connected:1
        node 1:    link enabled:0    link connected:1

This is awkward.  I had assumed that both nodes indicate for Link0

        node 0:    link enabled:1    link connected:0

Any help appreciated.

Volker

corosync.conf

totem {
        version: 2

        cluster_name: mail

        token: 3000

        token_retransmits_before_loss_const: 10

        clear_node_high_bit: yes

        crypto_cipher: none
        crypto_hash: none

        interface {
            linknumber: 0
            knet_transport: udp
            knet_link_priority: 20
        }
        interface {
            linknumber: 1
            knet_transport: udp
            knet_link_priority: 10
        }

}

nodelist {
        node {
        ring1_addr: 192.168.1.132
        ring0_addr: 192.168.2.132
        nodeid: 0
        name: mail3
        }
        node {
        ring1_addr: 192.168.1.134
        ring0_addr: 192.168.2.134
        nodeid: 1
        name: mail4
        }
}




-- 
=========================================================
   inqbus Scientific Computing    Dr.  Volker Jaenisch
   Hungerbichlweg 3               +49 (8860) 9222 7 92
   86977 Burggen                  http://www.inqbus.de
=========================================================

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