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consistent data-disk replica of the RDM volume to a virtual machine connected directly (via

iSCSI) to a CLARiiON storage system or a physical server. If the application data disk replica

needs to be assigned to the VMware ESX server, the LUN must be manually placed in the

VMware ESX server storage group, and the VMware administrator must then assign the replica

(application data disk) to an existing virtual machine.

For more information on using Replication Manager with VMware and CLARiiON storage systems, refer

to the EMC Replication Manager Administrator’s Guide available on Powerlink.

CLARiiON and VMotion

Migration with VMotion allows you to move a virtual machine between two ESX servers while the virtual

machine is powered on and performing transactions. When a migration with VMotion is performed, the

operations of the virtual machine can continue uninterrupted. The virtual machine must reside on a SAN

LUN accessible to both source and destination hosts. VMotion only moves the virtual machine

configuration file and memory contents to the alternate host. Any disks assigned to the VM are moved by

transferring their ownership.

The conditions for VMotion to work are:

• The VMware vCenter server and client must be installed on a Windows system.

• A Gigabit Ethernet connection is required between the two ESX Server hosts participating in VMotion

migration.

• The guest operating system must boot from a CLARiiON LUN. The virtual machine boot LUN and its

associated data disks must be shared between the source and destination hosts.

• VMware VMotion is supported with Fibre Channel and iSCSI connectivity to CLARiiON storage

systems. Furthermore, VMware VMotion is supported in a configuration where both of the following

occur:

• A single LUN is presented to two VMware ESX Server nodes.

• The ESX Server nodes are in a cluster in which one node accesses the LUN via FC and the other

node accesses the LUN via iSCSI.

CLARiiON storage systems preserve the LUN HLU number across both protocols. Therefore, when a

LUN is presented via FC to one host and iSCSI to another, a false snapshot is not detected.

• VMFS and RDM volumes are supported with VMotion.

• Both hosts must have identical CPUs (both CPUs are P4, for instance) unless VMware’s Enhanced

VMotion Compatibility mode is used. The CPUs must also be manufactured by the same vendor.

Migration with VMotion cannot occur when virtual machines are in a raw, clustered, or nonpersistent

mode.

Figure 20 shows two ESX servers with three NICs each. The recommended number of NICs is three;

two is the minimum requirement. A crossover or gigabit LAN connection should exist between the two

gigabit NICs on the two VMware ESX servers. For ESX 2.x, a virtual switch must be created with the same

network label on both servers for the two network cards to communicate. In VMware ESX 3.x/ESXi, a

VMotion VMkernel port group on a vSwitch must be created on both ESX servers for VMotion migration.

VMotion with VMFS volumes

In order to perform VMotion with VMFS volumes, the following prerequisites must be met:

• All VMFS volumes assigned to the virtual machine that is to be migrated must be shared by both ESX

servers.

• VMFS volumes must be in public access mode.

VMware ESX Server identifies VMFS-2 volumes by their label information. For VMFS-3 volumes, they

are identified by the Host LUN number. Hence, as a best practice (unless doing boot from SAN for the

EMC CLARiiON Integration with

VMware ESX Server

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