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Features

ESX has several features that work with the CLARiiON storage system. The features discussed in this

paper are VMotion, Distributed Resource Scheduling and VMware HA, VMware Clustering, and

Consolidated Backup technology. The Distributed Resource Scheduling, VMware HA, and Consolidated

Backup features are enhanced in ESX 4.0/ESX 4i.

VMware VMotion

ESX Server version 2.0.1 was the first platform to support VMotion. With VMotion, VMware

administrators can move virtual machine partitions from machine to machine while real workloads run in

the partitions. System administrators can use VMotion, a systems management and provisioning product

that works through VMware vCenter, to quickly provision and reprovision servers with any number of

virtual machines.

VMotion technology provides the ability to migrate a running virtual machine from one physical ESX

server to another—without application service interruption—allowing for fast reconfiguration and

optimization of resources without impacting users. With VMotion, VMware allows administrators to move

virtual machine partitions from machine to machine on the fly, as real workloads run in the partitions. This

allows administrators to do hardware maintenance without interrupting applications and users. It also

allows the administrator to do dynamic load balancing to maintain high utilization and performance.

VMware Storage VMotion

This feature, available in ESX 4.0, ESX 3.x, and ESXi, allows you to migrate a virtual machine from one

storage system to another while the virtual machine is up and running. For example, using either the

VCenter GUI (available in vSphere 4.0) or RemoteCLI interface, virtual machine files can be moved from

one FC LUN to another FC LUN without taking the virtual machine offline. Storage VMotion is supported

for VMFS volumes and qualified for FC-to-FC storage or FC-to-iSCSI storage and vice versa. For more

information on VMFS, see the “

LUN partitioning” section.

Distributed Resource Scheduling and VMware High Availability

The VMware Distributed Resource Scheduling (DRS) feature improves resource allocation across all hosts

by collecting resource (such as CPU and memory) usage information for all hosts and virtual machines in

the cluster and generating recommendations for virtual machine placement. These recommendations can be

applied automatically or manually. Depending on the configured DRS automation level, DRS can display

or automatically implement recommendations. The result is a self-managing, highly-optimized, highly-

efficient computer cluster with built-in resource and load balancing. In ESX 4.0/ESX 3.x/ESXi, VMware’s

Distributed Power Management reduces power consumption by intelligently balancing a data center's

workload. Distributed Power Management, which is part of VMware DRS, automatically powers off

servers whose resources are not immediately required and returns power to these servers when they are

needed.

VMware High Availability (HA) detects ESX hardware failures and automatically restarts virtual machines

and their resident applications and services on alternate ESX hardware, enabling servers to recover more

rapidly and deliver a higher level of availability. Using VMware HA and DRS together combines automatic

failover with load balancing. This combination results in a fast rebalancing of virtual machines after HA

has moved virtual machines to different hosts. In VMware vSphere 4, enhanced HA provides support for

monitoring individual virtual machine failures, irrespective of the state of the underlying ESX host.

VMware HA can now be configured to restart the failed virtual machine or send a notification to the

administrator.

VMware fault tolerance

The fault-tolerance features introduced with ESX 4.0 provide higher availability than VMware HA. The

fault-tolerance features allow you to protect any virtual machine from losing data, transactions, or

connections when there is a host failure. A duplicate virtual machine called the secondary VM of the

production (or primary) VM is created on a different host. The VMware vLockStep method captures inputs

EMC CLARiiON Integration with

VMware ESX Server

Applied Technology 8

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