# General Considerations Regardless of the size of a Parallels RAS installation, redundancy among core components of your setup is recommended to ensure the greatest possible uptime. For small deployments, all roles can be installed on a single server, whereas role segregation is recommended for large setups. The physical location of a Parallels RAS farm, including RD Session Hosts and VDI hosts, must be selected based on the location of back-end resources, such as databases and file servers. This means that if a front-end application connects to a database or works with files on a file server, the RD Session Host on which it will be installed should be located close to the database (or the file server) on the intranet with fast, reliable, low latency LAN connections. For example, let's say you have a client-server application that you want to make available to your users. To do so, you will install the client part on an RD Session Host and publish it for your users. The database will continue to run on a dedicated server. To guarantee fast and reliable database access, the RD Session Hosts server and the database server must be close to each other on the local network. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.parallels.com/landing/ras-reference-architecture/v20/deployment-scenarios/general-considerations.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.