One other thing to have in mind when configuring the HA probe is that the probe doesn't really offer any kind of HA functionality in today's definition of the term.
Consider the probe as a tool to automatically adjust some of the things that the hub it is installed on is doing to process some of the workload of another hub.
It is not in any way duplicating the existence of the other hub or masquerading.
This is of significant concern on your primary hub because many of the tasks it performs are singular and don't support any kind of availability. Like data_engine - you can only be running one instance of it. And sure, you can configure the HA probe to start it on the standby hub and it will continue to insert data in the database but anything on your network that's looking for data-engine will be looking for it on the primary hub and so it will appear down to those other probes until they are manually reconfigured (or reconfigured by a user configured script like is discussed in the doc that Luc posted - which is very good BTW.)
So you have to ask yourself if HA is even worth the effort given what works and what doesn't in a failure scenario.
What I can say is that the HA probe rarely saves downtime for me - mostly what it does is separate the UIM downtime into two pieces and then one of those pieces is experienced while your unexpected outage is occurring and then the second piece is experienced during "planned outages" that are required immediately following the restoration of normal function as you clean things up.
Original Message:
Sent: Nov 23, 2022 04:33 AM
From: PRAGYA KULSHRESHTHA
Subject: Should we put Secondary server attach queues in 'HA probe's queues to be disabled section'
Hello,
We have Primary hub called L, Secondary hub called M. alarms & qos communicated using attach queues on M & get queues on L
Q1. if L goes down (thereby get queues are down), will consecutive attach queues on M give queue_alert, will attach queue remain healthy?
Q2. In HA probe on Secondary Hub M; in 'Queues to disable section' should we add these attach queues to disable at the time of failover when HA is triggered?
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Pragya Kulshreshtha
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