VMware vSphere vCenter Server 4.0 - Manual (Page 63)

VMware DPM can use one of three power management protocols to bring a host out of standby mode:
Intelligent Platform Management Interface (IPMI), Hewlett-Packard Integrated Lights-Out (iLO), or Wake-On-
LAN (WOL). Each protocol requires its own hardware support and configuration. If a host does not support
any of these protocols it cannot be put into standby mode by VMware DPM. If a host supports multiple
protocols, they are used in the following order: IPMI, iLO, WOL.
N
OTE
Do not disconnect a host in standby mode or move it out of the DRS cluster without first powering it
on, otherwise vCenter Server is not able to power the host back on.
Configure IPMI or iLO Settings for VMware DPM
IPMI is a hardware-level specification and Hewlett-Packard iLO is an embedded server management
technology. Each of them describes and provides an interface for remotely monitoring and controlling
computers.
You must perform the following procedure on each host.
Prerequisites
Both IPMI and iLO require a hardware Baseboard Management Controller (BMC) to provide a gateway for
accessing hardware control functions, and allow the interface to be accessed from a remote system using serial
or LAN connections. The BMC is powered-on even when the host itself is powered-off. If properly enabled,
the BMC can respond to remote power-on commands.
If you plan to use IPMI or iLO as a wake protocol, you must configure the BMC. BMC configuration steps vary
according to model. See your vendor’s documentation for more information. With IPMI, you must also ensure
that the BMC LAN channel is configured to be always available and to allow operator-privileged commands.
On some IPMI systems, when you enable "IPMI over LAN" you must configure this in the BIOS and specify a
particular IPMI account.
VMware DPM using only IPMI supports MD5- and plaintext-based authentication, but MD2-based
authentication is not supported. vCenter Server uses MD5 if a host's BMC reports that it is supported and
enabled for the Operator role. Otherwise, plaintext-based authentication is used if the BMC reports it is
supported and enabled. If neither MD5 nor plaintext authentication is enabled, IPMI cannot be used with the
host and vCenter Server attempts to use Wake-on-LAN.
Procedure
1 Select the host in the vSphere Client inventory.
2 Click the Configuration tab.
3 Click Power Management.
4 Click Properties.
5 Enter the following information.
n User name and password for a BMC account. (The user name must have the ability to remotely power
the host on.)
n IP address of the NIC associated with the BMC, as distinct from the IP address of the host. The IP
address should be static or a DHCP address with infinite lease.
n MAC address of the NIC associated with the BMC.
6 Click OK.
Chapter 6 Using DRS Clusters to Manage Resources
VMware, Inc. 63