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Your architectural and sizing requirements are a function of several considerations:
- Are documents reloaded at the same time that users are interacting with them? If yes, then consider deploying the QDS, QMS, a failover DSC and the Source Documents on separate fabric than the User-facing components. This is only possible if you do have a Publisher licence, otherwise all components must be on the same machine.
- Sizing the back-end Reload server depends on how many documents are reloaded at the same time, and how big those are. If using Loop & Reduce then double the memory requirements of those documents. Remember to install all required database connectivity packages/drivers and configure & test any ODBC System DSNs.
- Sizing the front-end server depends on how many documents will be in memory and interacted with at the same time, plus cache considerations for the active user community. Consider also that Concurrent Users require CPU core capacity for concurrent associative queries (each visible visualisation is recalculated at the same time whenever a field selection is made), and the Active Users (logged in and looking at a document but not necessarily waiting for queries to finish) causes additional RAM utilisation for cached objects. The front-end needs to be quite a bit larger than the back-end, and may contain IIS, QvS, primary DSC and User Document folders.
There is some relevant guidance at https://community.qlik.com/t5/Google-Documentation/QlikView-Server-amp-Publisher/ta-p/1526098 that can be used to guide any VM/Cloud deployment of QlikView.
See also https://help.qlik.com/en-US/qlikview/latest/Subsystems/Server/Content/QV_Server/QlikView-Server/QVSR...
Installation and Configuration is reasonably trivial. Migration from the older environment requires a little more care involving copying the files into similar locations and editing settings via QMC or directly in QVPR. I strongly recommend that you engage Qlik Consulting or a Qlik Implementation Partner for assistance, and the work should generally take only 1-2 days unless you are upgrading from a very old release, or have customised components (eg Visualisation Extensions) that need extensive revalidation on the latest product. The duration of the project will depend on how much rigour you need it to have, but the technology parts are not very complicated.