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Figure 21. VMware vCenter 4.0 management screen showing how VMotion migration is

initiated and completed

CLARiiON with VMware Distributed Resource

Scheduling and High Availability

Both VMware Distributed Resource Scheduling (DRS) and VMware High Availability (HA), when used

with VMotion technology, provide load balancing and automatic failover for virtual machines with

VMware ESX 4.0/3.x/ESXi. To use VMware DRS and HA, a cluster definition must be created using

VMware vCenter 2.0. The ESX hosts in a cluster share resources including CPU, memory, and disks. All

virtual machines and their configuration files on ESX servers in a cluster must reside on CLARiiON

storage, so that you can power on the virtual machines from any host in the cluster. Furthermore, the hosts

must be configured to have access to the same virtual machine network so VMware HA can monitor

heartbeats between hosts on the console network for failure detection.

The conditions for VMware DRS and HA to work are as follows:

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

associated data disks, and configuration files must be shared among all ESX servers in a cluster.

• VMware HA and DRS are supported with both Fibre Channel and iSCSI CLARiiON storage systems.

• Both VMFS and RDM volumes are supported and are configured exactly as they would be for

VMotion. See the “

CLARiiON and VMotion” section on page 34.

• DRS is based on the VMotion technology, therefore, ESX servers configured for a DRS cluster must

pass the CPU type check (identical CPUs, same manufacturer). VMware HA does not depend on CPU

type check.

EMC CLARiiON Integration with

VMware ESX Server

Applied Technology 37

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