Post reboot, one of the NSX manager nodes is showing an LM to LM sync warning

Products

• VMware NSX

Issue/Introduction

• You are using a Federated infra and after recent rolling reboot of NSX managers on one of the sites, one of the manager nodes is showing an LM to LM sync warning
  
  
  
  
• There are no issues with connectivity between managers across sites from problem manager and data shows synced when when you run the command 'get site-replicator remote-sites' the remote site shows 'data synced' and If the alarm is manually resolved, it retriggers again.
  
  

Environment

VMware NSX

Cause

After a synchronization alarm validly triggers, if the leader of the ArAlarmService changes from an NSX Manager to another NSX Manager before the alarm resolves then the alarm stays uncleared 

Resolution

To resolve the alarm, restart the Async Replication service on the Local NSX Manager

1. SSH as admin user to any NSX Manager
   
   
2. Identify the leader of the Async Replicator service
   
   > get cluster status verbose | find ArAlarmService

In the section ASYNC_REPLICATOR, check for the UUID of the Ar Alarm Service
 ArAlarmService      1       SMALL     <node UUID>       1641194
   
   
3. ssh to this node if not already on it and restart the service
   
   # systemctl stop async-replicator-service
# systemctl start async-replicator-service
   
   
4. Resolve the Synchronization Alarm on the NSX UI

If the issue persists even after following the above steps, feel free to open a case with Broadcom Support Team