IM is slow responding while HA standby Hub is down

Document ID : KB000118803
Last Modified Date : 01/11/2018
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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?
UIM 9.0 and earlier
Distsrv 9.X and earlier
nas 9.x and earlier
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.
explained to client he needed to disable forwarding of nas and distsrv while secondary hub is down.