The values in the following table are minimum values for installations on a single server and for web, application, and cache servers that are running SharePoint Server 2019 in a multiple server farm installation.
For all installation scenarios, you must have sufficient hard disk space for the base installation and sufficient space for diagnostics such as logging, debugging, creating memory dumps, and so on. For production use, you also need to have additional free disk space for day-to-day operations. In addition, you should maintain two times as much free space as you have RAM for production environments.
NOTE
Hard disk space and number of drives depends on the amount of content and the way you choose to distribute data for a SharePoint environment.
