[LUDOC-480] Add enable/disable LNet MR/discovery settings, if not there.

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Assignee: Lustre Manual Triage
• Reporter: Oz Rentas

Description

In looking to disable LNet discovery, referred to the 2.x manual (continuous).  Was not able to discern which setting (0 or 1) would disable discovery.  Could we clarify in this section below, if not documented?  A section such as 9.1.7 would be perfect.  Thanks.

9.1.5.4. Configuration

Dynamic Discovery is very light on the configuration side. It can only be turned on or turned off. To turn the feature on or off, the following command is used:
lnetctl set discovery [0 | 1]
To check the current discovery setting, the lnetctl global show command can be used as shown in Section 9.1.2, “Displaying Global Settings”.

 

9.1.2. Displaying Global Settings

The active LNet global settings can be displayed using the lnetctl command shown below:
lnetctl global show
For example:

1. lnetctl global show
   global:
   numa_range: 0
   max_intf: 200
   discovery: 1
   drop_asym_route: 0
    

   9.1.7. Enabling and Disabling Routing

When an LNet node is configured as a router it will route LNet messages not destined to itself. This feature can be enabled or disabled as follows.
lnetctl set routing [0 | 1]

1. 0 - disable routing feature
2. 1 - enable routing feature
    

The reference below appears to provide two (2) correct ways to accomplish the task, but they are not the canonical resource:

https://pubs.cray.com/bundle/ClusterStor_E1000_Field_Installation_Guide_H-6203/page/Optional_Disable_Multi-Rail_and_Dynamic_Discovery.html