|IS Version upgrading to||5.0.0-21||5.1.0-5||5.2.0-5||5.3||5.4|
|Upgrade by "Simple Reboot"||Yes||Yes||Yes||Yes||Yes|
|Upgrade by "Migrate and Reboot"||Yes||Yes||Yes||Yes||Yes*|
|Upgrade by "LiveUpgrade"||N/A||N/A||Yes||N/A||Yes*|
* Applicable only for CentOS 6 KVM/XEN
Yes - recommended by OnApp
N/A - not recommended by OnApp, will not update properly the Cloudboot OS or Integrated Storage
This upgrade method requires to reboot the CloudBoot compute resources with all VSs (Virtual Servers) powered off to apply security patches, kernel upgrades and updated drivers to the CloudBoot OS. Simple reboot is the fastest and the safest way to upgrade, but does result in some downtime for the Virtual Servers. Integrated Storage virtual disks do not become degraded. This upgrade method also upgrades the Integrated Storage platform as a component of the CloudBoot OS.
Migrate and Reboot
This upgrade method requires to reboot the CloudBoot compute resources to apply security patches, kernel upgrades and updated drivers to the CloudBoot OS and Integrated Storage platform. Your VSs will remain online, you only need to migrate them from the CloudBoot compute resources that will be rebooted. Keep in mind that it is required to repair any degraded virtual disks before proceeding with reboot.
This upgrade method upgrades the Integrated Storage platform only. Your VSs will remain online. There is almost no risk of data loss and zero downtime. However this method does not update the CloudBoot OS, you will not get the security patches, kernel upgrades and updated drivers if they are included in the release.