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I've been trying to find examples of on premises deployments of Dynamics AX that are not only highly available but also have zero downtime in a 24/7 production facility scenario. I haven't been able to find one so i was wondering if that is even possibly to achieve, or is it always the case that a minimal service window is needed during release update?
Zero downtime is not possible at the moment. There will be downtime when you apply updates.
Microsoft is aiming for "zero downtime" at least for the cloud version, and I would expect that the same improvements would be available in on-premises, too. If not at the same time, then later.
But I would expect even in the "zero downtime" there would be a moment where you can't have ongoing transactions in an AOS. Since the system must somehow switch from the old version to the new version.
And I don't know how they will get rid of the downtime that is needed for the database sync. New version might introduce new database fields, so the database must be synced before the application can access the new fields. If the application tries to access a field that is not in the database, you will get an excption. The sync would need to happen before updating the application.
Thanks Nikolaos for the quick reply. Although it's not the answer i would have hoped for it what i was fearing the case would be ;)
One last question if i may;
Would you know of any best practices to keep the downtime to a minimum during a service window? i.e. regular restarts of the AOS severs to keep tempdb's minimized, procedures for test and validation etc?
I don't think you have much control over the downtime duration. It's almost entirely in Microsoft's hands since they design the deployment process and scripts.
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