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Checking Low Latency Transport operation

Use the lltstat command to verify that links are active for LLT. This command returns information about the links for LLT for the system on which it is typed. See the lltstat(1M) manual page.

In the following example, lltstat -n is typed on each system in the cluster.

 To check LLT operation

  1. Log into system01.

# lltstat -n

Output resembles:

LLT node information:
Node State Links
* 0 system01 OPEN 2

1 system02 OPEN 2

  1. Log into system02.

# lltstat -n

Output resembles:

LLT node information:
Node State Links
0 system01 OPEN 2

* 1 system02 OPEN 2


  Note   Each system has two links and that each system is in the open state. An asterisk (*) denotes the system on which the command is typed.


With LLT configured correctly, the output of lltstat -n shows all of the systems in the cluster and two links for each system. If the output shows otherwise, you can use the verbose option of lltstat. For example, type lltstat -nvv | more on a system to view additional information about LLT. In the following example, lltstat -nvv | more is typed on a system in a two-node cluster.

  1. Log into system01.

# lltstat -nvv | more

Output resembles:

Node State Link Status Address
*0 system01 OPEN lan1 UP 08:00:20:93:0E:34
lan2 UP 08:00:20:93:0E:34
1 system02 OPEN lan1 UP 08:00:20:8F:D1:F2
lan2 DOWN 08:00:20:8F:D1:F2

2 CONNWAIT
lan1 DOWN
lan2 DOWN

.

.

.
31 CONNWAIT
lan1 DOWN
lan2 DOWN


  Note   The output lists 32 nodes. It reports on the two cluster nodes, system01 and system02, plus non-existent nodes. For each correctly configured system, the information shows a state of open, a status for each link of up, and an address for each link. However, in the example above, the output shows that for node system02, the private network may have failed, or the information in /etc/llttab may be incorrect.


To obtain information about the ports open for LLT, type lltstat -p on any system. In the following example, lltstat -p is typed on one system in the cluster.

  1. Log into system01.

# lltstat -p

Output resembles:

LLT port information:
Port Usage Cookie
0 gab 0x0
opens: 0 1 3 4 5 6 7 8 9 10 11 12 13...
connects: 0 1


  Note   The two systems with node ID's 0 and 1 are connected.

See /etc/llthosts.