Add hardware requirements documentation (#922)

docs/_data/toc.yml

@@ -23,6 +23,8 @@ toc:
     subfolderitems:
       - page: Software Requirements
         url: /software-requirements.html
+      - page: Hardware Requirements
+        url: /hardware-requirements.html
       - page: Installation Guides
         url: /install.html
         subsubfolderitems:

docs/hardware-requirements.md

@@ -0,0 +1,46 @@
+---
+title: Hardware Requirements
+---
+
+Open XDMoD has few strict hardware requirements.  The hardware required to run
+Open XDMoD depends on the quantity of data it will process and store as well as
+the number of concurrent users.  The supported hardware configuration is a
+single server that will run both the web and database services.  This may be a
+physical server or a virtual machine; no containerization technologies are
+supported at this time.  For security reasons it is suggested, but not
+required, that no other services run on the same machine and that access is
+limited to system administrators.  All end user access should be restricted to
+the web portal.
+
+For example, a virtual machine with 4 (2018) processor cores and 16GB of memory
+is sufficient to serve an Open XDMoD instance with moderate user activity and
+28M jobs run over 11 years.
+
+## Processor Requirements
+
+While a lightly used Open XDMoD installation requires only a single processor
+core (the equivalent of an Intel Nehalem server processor from 2010 or better),
+it is recommended to use a 64 bit x86 processor with at least two cores. XDMoD
+instances supporting sites that process a large number of jobs or many
+concurrent users will require additional CPU resources.
+
+## Memory Requirements
+
+Open XDMoD requires a minimum of 256MB of RAM.  This would be sufficient for
+testing purposes, but any substantial amount of data will require more memory.
+For less than 1 million job records 4GB would be acceptable.  For less than 25
+million job records 16GB would be sufficient.  For over 100 million job records
+64GB would be desirable.
+
+## Storage Requirements
+
+The uncompressed size of the Open XDMoD package is roughly 150MB and
+dependencies will require additional space depending on what is already
+installed on your system.  In addition, temporary space is required for various
+Open XDMoD processes.  Roughly 300MB of disk space is required per each million
+jobs.
+
+## Graphics Card Requirements
+
+Open XDMoD does not require a graphics card and will not use any GPU in your
+server.