What is the difference between High Availability On-Premise Pollers and On-Premise Poller Groups?
High Availability On-Premise Pollers and On-Premise Poller Groups are two different approaches to ensuring service continuity and reliability in a monitoring setup. Let's examine the differences and explore how to maintain service continuity using them.
A comparison between High Availability On-Premise Pollers and On-Premise Poller Groups
The table below highlights the differences between High Availability and On-Premise Poller Groups:
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High Availability On-Premise Pollers
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One-to-one (primary and standby)
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Many-to-many (group-based): one or more On-Premise Pollers assigned to more than one monitor based on standby
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The Standby On-Premise Poller takes over
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Any available On-Premise Poller in the standby list takes over
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No
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Yes
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Scalability
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Limited (per On-Premise Poller pair)
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High (multiple On-Premise Pollers per group)
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Achieving High Availability with On-Premise Poller Groups
You can achieve High Availability using On-Premise Poller Groups, but the mechanism is different from classic one-to-one High Availability.
In an On-Premise Poller Group, High Availability is accomplished through redundancy and load balancing. Multiple On-Premise Pollers are available to take over if any On-Premise Poller fails, providing both fault tolerance and continuous monitoring.
Unlike the strict primary-standby relationship in classic High Availability, On-Premise Poller Groups allow any On-Premise Poller in the group to assume the monitoring role, making the setup more flexible and scalable.
If any On-Premise Poller goes down, one from the standby pool automatically takes charge of the monitoring tasks. Any affected monitors associated with the On-Premise Poller that went down seamlessly resume polling through the new Standby On-Premise Poller. Once the unavailable On-Premise Poller becomes available again, it will become part of the standby group.
Related articles
- The High Availability feature for On-Premise Pollers
- On-Premise Poller Groups
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