Latency, not to be confused with bandwidth, is a known factor since distance is key to determining latency – no matter how fast a connection, data must still physically travel the distance from cloud to machine and is constrained by the laws of physics 🙂 With this in mind, we can reduce the travel time by staying in one availability zone. Most of the clients we work with actually realize better performance after migrating to the cloud.
When working with clients on Cloud Migrations, the first step is to understand their environment. To do this, we start with a holistic view, formulating a detailed plan that serves as a roadmap. Using this roadmap, we work with the client to transfer and configure data (Database(s), Imagery, Flat Files etc.), working/project files (ArcMap/Pro documents, scripts, proprietary information), web applications and any third party integrations. After all configurations are complete, we validate the Cloud Environment through a client testing and QA/QC Phase to work out any and all issues. We then hand the keys over and GO LIVE!
Deploying and managing a 3-tier environment in the cloud is standard practice for many of the organizations we serve. Migration, when planned correctly can be a smooth and painless experience.
This really depends on the Esri software that is in use. You can find the specifications on Esri’s website. Here is a link to get you started: ArcGIS Server 10.8 system requirements—ArcGIS Enterprise system requirements | Documentation
There will always be challenges to overcome when encountering something different or unknown. If some of your data or technology is proprietary, you may not legally be able to deploy to the cloud. You may need to modify and/or map your application design and architecture to follow the cloud architecture. You could experience downtime due to technical outages (loss of power, maintenance, etc), but this would also be true on-premise
Migrating your GIS to AWS, Azure or any cloud solutions provider is accomplished in phases. Here is a brief overview of the methodology we use at ROK. Keep in mind that there are several steps within each phase, but this will give you an overview of what needs to take place.