OpenDocMan DMS was designed to use MySQL.
There are a couple of reasons why a file you are trying to upload is failing due to file size restrictions. OpenDocMan has its own maximum file size setting which you can edit in the Admin->Edit Settings page. There may also be a need to re-configure your PHP server in order to accept larger files.
upload_max_filesize = 10M
post_max_size = 10M
OpenDocMan was created to run on Apache web servers, but we have many users that have successfully installed OpenDocMan on Microsoft IIS servers. Yes.
OpenDocMan is platform independent. What that means is it will run on any operating system (Linux, Unix, Windows, Mac,etc.) as long as that operating system can run PHP, MySql, and a web server.
In order for OpenDocMan to work properly you must make sure that you configure the “dataDir” value with a valid file path. This file path should be outside of the opendocman install folder and must be readable and writeable to the web server. If you are getting this message then you need to check these items.