ESXi hosts can be upgraded from previous version or from ESXi 4.x in several ways. ESXi Installable 4.x hosts can be upgraded in one of three ways:
An interactive upgrade via an ESXi Installable image
A scripted upgrade, or using VUM. ESXi 5.0 hosts can be upgraded to 5.1
The
esxclicommand-line tool
While upgrading VMware ESXi hosts from a previous version of ESXi 4.x to the latest version of 5.x using any of the three supported approaches, 50 MB must be accessible on the local VMFS volume. This space is required to store the ESXi server's configuration data in temp mode.
The following table illustrates approaches for upgrading ESXi to the latest version:
|
Upgrade approaches |
From ESX/ESXi 4.x to ESXi 5.5 |
From ESXi 5.0 to ESXi 5.5 |
From ESXi 5.1 to ESXi 5.5 |
|---|---|---|---|
|
Using vSphere Update Manager |
Possible |
Possible |
Possible |
|
Using interactive upgrade from devices such as CD DVD or... |