VMware vSphere 4 Installation Guide download pdf (Page 73)

Upgrade to ESX 4.0 or ESXi 4.0 11

The upgrade procedures differ for ESX 4.0 and ESXi 4.0.

CAUTION

You must upgrade to vCenter Server before you upgrade ESX/ESXi. If you do not upgrade in the correct

order, you can lose data and lose access to your servers.

When you upgrade a host from ESX 3.x to ESX 4.x, the customized partitions in 3.x are not replicated in

4.x.

This chapter includes the following topics:

“Upgrade ESX Hosts,” on page 73

“Upgrade ESXi Hosts,” on page 75

Upgrade ESX Hosts

You can use vSphere Host Update Utility to upgrade ESX 3.x hosts to ESX 4.0.

vSphere Host Update Utility is meant for small deployments in which a host is being managed by a single

administrator. For example, the following scenario is not supported: Admin 1 starts to upgrade host1 using

vSphere Host Update Utility. Admin 2 starts the vSphere Host Update Utility, detects that host1 is running

ESX 3.5, and tries to upgrade the host. The vSphere Host Update Utility does not report that an upgrade is

already in progress.

VMware supports and recommends that you perform one upgrade at a time when you use vSphere Host

Update Utility. If you do upgrade multiple hosts simultaneously and the upgrade fails for one of the hosts,

you must close and restart vSphere Host Update Utility to retry the upgrade on the host that failed. In this

case, you must wait until the upgrade for all the hosts is complete before you restart the utility. For simplicity,

it is best practice to upgrade one host at a time.

IMPORTANT For large deployments and for environments with clustered hosts, VMware recommends that you

use vCenter Update Manager instead of vSphere Host Update Utility.

When you upgrade a host, no third-party management agents or third-party software applications are

migrated to the ESX 4.0/ESXi 4.0 host.

Prerequisites

Prepare the host before you upgrade it.

See “ESX Hardware Requirements,” on page 27 and “Recommendations for Enhanced ESX

Performance,” on page 29.

Make sure you are logged in to an account that has administrator permissions on your computer.

VMware, Inc.

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VMware vSphere 4 Installation Guide Page 73