Dell AX4-5 Specifications download pdf (Page 9)

and events from the primary VM and sends them to the secondary VM, so the VMs are identical. The

secondary VM can take over execution from the primary VM, thus providing another level of fault

tolerance.

All hosts must have access to the primary VMs datastores and networks through a distributed switch.

When a VM is configured to be fault tolerant, the DRS feature is automatically disabled. For more details,

please see the vSphere Availability Guide available on

www.vmware.com.

VMware clustering

The ESX server can be clustered at a virtual machine level within a single ESX server (referred to as an in-

the-box-cluster) or between two or more ESX servers (referred to as an outside-the-box-cluster). The

cluster setup within a box is useful for providing high availability when software or administrative errors

are the likely causes of failure. Users who want a higher level of protection in the event of hardware

failures, as well as software/logical failures, benefit from clustering outside the box.

VMware N_Port ID Virtualization

N_Port ID Virtualization (NPIV) within the Fibre Channel protocol allows multiple virtual N_Port IDs to

share a single physical N_Port. In other words, you can define multiple virtual initiators through a single

initiator. This feature, available in ESX/ESXi, enables SAN tools that provide QoS at the storage-system

level to guarantee service levels for VM applications.

Within VMware ESX, NPIV is enabled for each virtual machine, so that physical HBAs on the ESX server

can assign virtual initiators to each virtual machine. As a result, within ESX Server, a virtual machine has

virtual initiators (WWNs) available for each HBA. These initiators can log in to the storage like any other

host. VMware NPIV support is limited to RDM volumes. For more details about this configuration, please

see the “

CLARiiON and VMware NPIV support” section.

VMware Site Recovery Manager (SRM)

VMware Site Recovery Manager (SRM) integrates various EMC replication software products (such as

MirrorView/S) to automate the failover process for virtual machines. SRM centralizes the creation and

management of the disaster recovery strategies that are implemented at the secondary site. SRM uses

EMC’s array-based snapshot technologies to test the failover process, and to ensure that the recovery image

is consistent.

SRM requires that the protected (primary) site and the recovery (secondary) site each have two independent

virtual infrastructure servers to facilitate the failover process. Array-based Site Recovery Adapters (SRAs)

are also installed at both sites; these SRAs communicate with the storage systems (arrays). For more

information about using SRM with CLARiiON storage systems, please see the “

CLARiiON and VMware

Site Recovery Manager (SRM)

” section.

EMC CLARiiON overview

The EMC CLARiiON family of networked storage systems brings best-in-class performance to the mid-tier

with a wide range of storage solutions—all based on the powerful, proven, eight generations of CLARiiON

architecture. They provide multiple tiers of storage (both Fibre Channel and SATA) in a single storage

system, which significantly reduces acquisition costs and management costs by allowing multiple tiers to

be managed with a single management interface. The next-generation CLARiiON systems, called the CX4

series with UltraFlex™ technology, deliver storage systems that you can easily customize by populating

your I/O slots with either Fibre Channel or iSCSI I/O modules. Products with multiple back ends such as

the CX4-240, CX4-480, and CX4-960 can support disks operating at both 2 Gb/s and 4 Gb/s

simultaneously.

EMC CLARiiON Integration with

VMware ESX Server

Applied Technology 9

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Dell AX4-5 Specifications Page 9

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