[LU-17519] Remove dead peers automatically

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Cyril Bordage
• Reporter: Cyril Bordage

Description

When a client is decommissioned, it stays forever in the peer list of the servers and generates a stream of messages like:

lnet_handle_recovery_reply()) peer NI (10.11.12.13@o2ib) recovery failed with -113
lnet_handle_recovery_reply()) Skipped 1234 similar messages

It is cleaner to remove it from the list of peers. It avoids the need to change the value of lnet_recovery_limit to remove LNetError messages about this removed client. Moreover, having this parameter changed can mask a problem on an active but faulty node.

However, it can be cumbersome to remove it manually. That is why an automatic deletion could be relevant.

This feature could use a parameter to enable it and to set the delay before a client is considered to be removed.