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

[Jan Friesse]

Just for archival purpose, this issue is now worked on at gh 
https://github.com/corosync/corosync/issues/527

> 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
>          }
> }
> 
> 
> 
> 
> 
> 
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