If you have a server with Nimbus it will be running on the CentOS operating system, which then your control panel (if you have one) sits on top of. In mid 2014 we moved to the newer CentOS 6 for all new servers.
CentOS 5 is being phased out in 2016, so if your server with us is running CentOS 5 you’ll need to look at moving to a newer server. You can check what version of CentOS your server is running by going to Services -> My Services -> (Server host name) -> Management Actions, or drop us a support ticket.
Unfortunately there is no way to directly upgrade from CentOS 5 to 6, so instead, we will fire you up a brand new CentOS 6 server to match your existing one, free for thirty days to move your sites over to. If you’d prefer us to handle, we’ll be happy to at our hourly rate of £80 plus VAT – the actual time it will take will depend on how big your sites are. Rest assured we’ll take our upmost care, and treat as a full migration, like when you first joined Nimbus.
You’ll not only get the benefit of a newer version of CentOS, but also the newer hardware too, so hopefully you’ll also see some improvements in traffic capacity/site speeds.