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VMFS-3 volume. Ensure that the VMFS-3 volume has enough space to accommodate the swap files. With

ESX 2.x, a single swap file is used for all virtual machines.

Application data disks residing on virtual machines should be aligned with the CLARiiON disk stripe, just

as they are on physical servers. When aligning RDMs, align them at the virtual machine level. For

Windows virtual machines, use diskpart from Windows 2003 SP1 to perform the alignment.

For VMFS-2 volumes, the alignment can be done at the ESX Server level and virtual machine level using

fdisk. VMFS-3 volumes are already aligned to 64KB during creation; however, for Intel-based systems

the virtual disks from a VMFS-3 volume need to be aligned at the virtual machine level. OS disks are

difficult to align, however they can be aligned using native or specialized software if needed.

Align app/data disks to a 64k. (This step will not be required on Windows 2008, Vista, or Windows 7,

because in these newer operating systems partitions are created on 1MB boundaries by default.) When

formatting the app/data NTFS partitions for Windows virtual machines:

• If you are running applications, follow the recommended allocation unit size if there is one.

• If there are no allocation unit recommendation, or if this is just a file share, use 8K or multiples of 8K.

For best performance, use VI Client or Virtual Infrastructure Web Access to set up your VMFS-3 partitions

instead of using the ESX 4.0 or 3.x service console. Using VI Client or VI Web Access ensures that the

starting sectors of partitions are 64K-aligned, which improves storage performance. Please review the

VMware white paper on alignment, available on vmware.com, for details. This white paper is at

http://www.vmware.com/pdf/esx3_partition_align.pdf.

Using CLARiiON metaLUNs, LUN migration, and Virtual

Provisioning technology with VMware ESX 4.0/3.x/ESXi and 2.x

CLARiiON virtual LUN technology provides an additional layer of abstraction between the host and back-

end disks. This technology consists of two features: CLARiiON metaLUNs and the CLARiiON LUN

migration that is available on the CLARiiON storage system. This section explains how CLARiiON

metaLUNs and CLARiiON LUN migration work with VMware ESX Server.

CLARiiON metaLUNs are a collection of individual LUNs. They are presented to a host or application as a

single storage entity. MetaLUNs allow users to expand existing volumes on the fly using the stripe or

concatenation method.

CLARiiON LUN migration allows users to change performance and other characteristics of existing LUNs

without disrupting host applications. It moves data—with the change characteristics that the user selects—

from a source LUN to a destination LUN of the same or larger size. LUN migration can also be used on a

metaLUN.

Virtual Provisioning, generally known in the industry as thin provisioning, increases capacity utilization for

certain applications and workloads. It allows more storage to be presented to an application than is

physically available. More importantly, Virtual Provisioning allocates physical storage only when the

storage is actually written to. This allows more flexibility and can reduce the inherent waste in

overallocation of space and administrative management of storage allocations. For more details on

CLARiiON Virtual Provisioning, please see the EMC CLARiiON Virtual Provisioning white paper

available on EMC.com and Powerlink.

CLARiiON metaLUNs, LUN migration, and Virtual Provisioning are supported with both VMFS and RDM

volumes.

Expanding and migrating LUNs used as raw device mapping

A LUN presented to VMware ESX Server (ESX 4.0, 3.x, or ESX 2.x) can be expanded with metaLUNs

using the striping or concatenation method. After the CLARiiON completes the expansion, rescan the

HBAs using either VMware vCenter for VMware ESX 3.x/ESXi or the Management User Interface for

EMC CLARiiON Integration with

VMware ESX Server

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