VMware vSphere 4 Installation Guide download pdf (Page 81)

Roll Back an ESXi Update, Patch, or Upgrade

For purposes of rollback, the term update refers to all ESXi patches, updates, and upgrades. Each time you

update an ESXi host, a copy of the ESXi build is saved on your host. If you think an ESXi patch might be making

your host not work as expected in your environment, you can roll back the update.

ESXi permits only one level of rollback. Only one previous build can be saved at a time. In effect, each ESXi 4.0

host stores up to two builds, one boot build and one standby build.

When you manually boot into the standby build instead of the current boot build, an irreversible rollback

occurs. The standby build becomes the new boot build and remains the boot build until you perform another

update.

Procedure

1 Reboot the ESXi 4.0 host.

2 When the page that displays the current boot build appears, press Shift+r to select the standby build.

3 Press Shift+y to confirm the selection and press Enter.

The previous update rolls back. The standby build becomes the boot build.

Restore the ESX Host Configuration

If you backed up your ESX service console and VMFS files, you can restore your original ESX host configuration.

Procedure

1 Reinstall the original version of ESX on the host. See the Installation Guide.

2 Restore the backed-up service console and local VMFS files.

See http://www.vmware.com/resources/techresources/610.

Restore the ESXi Host Configuration

If you created a backup of the ESXi host configuration, you can restore the configuration.

To restore a configuration on a host, you must run the vSphere CLI virtual appliance from a remote host. When

you restore the configuration, the target host must be in maintenance mode, which means all virtual machines

(including the vSphere CLI virtual appliance) must be powered off.

For more information, see the ESXi and vCenter Server Setup Guide.

For more information about the VMware vSphere Command-Line Interface and the vicfg-cfgbackup

command, see the vSphere Command-Line Interface Installation and Reference Guide.

Procedure

1 Restore the ESXi software.

Reinstall the ESXi Installable software by using the Installation CD.

Recover the ESXi Embedded software by using the Recovery CD.

2 Install the vSphere CLI.

3 In the vSphere CLI, run the vicfg-cfgbackup command with the -l flag to load the host configuration

from a specified backup file.

Chapter 12 Postupgrade Considerations for Hosts

VMware, Inc. 81

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VMware vSphere 4 Installation Guide Page 81