High Availability Active-Active Setup

andrewl657 over 8 years ago

Hello,

I'm looking for more information of why Appian suggests Active-Passive setup vs Active-Active for High Availability. Our organization has to have Active-Active for our current setup but we are being told Appian 16.2 has an issue with Active-Active and it won't be fixed until the next scheduled release. Can you please give more information into what the problem is and how we monitor? Also if fixed in next release when will that be?

Thanks.

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0 juergeng over 8 years ago

Yes - the 50 ms is the max. response time of your network for the heart beat of the K-engines (Appian back-end engines - running as separate OS processes). In case of failover, the Backup Engines will step in to perform the necessary work. This demands that both Primary and Secondary Engines (Back-up Engines) share the same KDB-Files. It has nothing to do with Business Databases. If the Platform gets busy with handing over the work from Primary Engines to Secondary Engines because it thinks it is necessary (lag time of network) than it can be swapping back and forth and only less computing resources are left to respond properly to process execution. For more information please see: forum.appian.com/.../Hardware_Engine_Failover_Configuration.html and forum.appian.com/.../High_Availability_and_Disaster_Recovery_Configurations.html
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0 juergeng over 8 years ago

Yes - the 50 ms is the max. response time of your network for the heart beat of the K-engines (Appian back-end engines - running as separate OS processes). In case of failover, the Backup Engines will step in to perform the necessary work. This demands that both Primary and Secondary Engines (Back-up Engines) share the same KDB-Files. It has nothing to do with Business Databases. If the Platform gets busy with handing over the work from Primary Engines to Secondary Engines because it thinks it is necessary (lag time of network) than it can be swapping back and forth and only less computing resources are left to respond properly to process execution. For more information please see: forum.appian.com/.../Hardware_Engine_Failover_Configuration.html and forum.appian.com/.../High_Availability_and_Disaster_Recovery_Configurations.html
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