Depending on the upgrade that is performed your server with us may need to be rebuilt, rebooted or nothing may need to happen at all.
|RAM/CPU/Disk upgrades||Operating System Change||IP Address addition|
|Linux VPS||Reboot (1-2* Minutes Downtime)||Rebuild (15 - 20 Minutes downtime + Data Loss)||Reboot (1-2* Minutes Downtime)|
|Windows VPS||Reboot (3-5* Minutes Downtime)||Rebuild (20 - 30 Minutes downtime + Data Loss)||Reboot (3-5* Minutes Downtime)|
|Web/Reseller hosting||No Downtime||N/A||No Downtime|
* This may be longer if the server forces a disk check to be run
In most cases adding an IP address to a Linux or Windows system shouldn't cause any disruption, however if our Cloud Management system isn't able to log in to your server it will force a reboot to allocate the additional IP, so it's best to plan for this rather than be caught off guard.