<div dir="ltr">Upgrading involves three systems.<br><ul><li>The hardware every 4 years, if not virtualised or in the cloud.<br></li><li>The server software every 3 years.<br></li><li>The repository software each year.<br></li>
</ul><div><a href="http://wiki.lib.sun.ac.za/index.php/SUNScholar/Upgrading">http://wiki.lib.sun.ac.za/index.php/SUNScholar/Upgrading</a></div></div>