IM is slow responding while HA standby Hub is down

Document ID : KB000118803
Last Modified Date : 01/11/2018
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Issue:
We have Primary Hub and HA standby Hub in different DC.
Each DC also have multiple tunnel servers connected to customers' hub servers.
While is HA standby hub/tunnel servers were down, the Infrastructure Manager is very slow responding when connecting to the primary hub.
Our operation team reported the following issues while HA hub/tunnel servers are down.
1. can’t accept alarms from IM Alarm Console.
2. can’t check customer hub/robot status from IM.
3. can’t restart nas probe from Primary Hub server rraudcuimhub01 from IM.

How to troubleshoot the slow responding IM issues?
Environment:
UIM 9.0 and earlier
Distsrv 9.X and earlier
nas 9.x and earlier
 
Cause:
nas and distsrv had been setup to forward / replicate information to the HA hub.
when it was down this cause a slow down in these probes which affected IM.
 
Resolution:
explained to client he needed to disable forwarding of nas and distsrv while secondary hub is down.