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Dell EqualLogic FS7500 – Unified block and file storage for virtual workloads

Sections

This white paper contains the following sections:

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Storage Options for VMware

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The Dell EqualLogic FS7500 storage solution for VMware

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Storage Performance

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Test Methodology

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Test Results

Storage Options for VMware

The VMware® vSphere™ suite provides a hypervisor that supports full operating system virtualization

within a virtual machine (VM). A VM operates exactly like a physical server; it has its own virtual

hardware including processor(s), memory, hard disks, and network interfaces. Each VM runs its own

operating system, whether it is Windows™ ® or Linux, just like a physical server. Most major

applications and databases, for example Microsoft® Exchange®, Microsoft® SQL Server®, Microsoft®

SharePoint® and Oracle® 11g, are fully supported in VMware virtual environments. Application

performance is just as important in a virtual environment as it is in a physical environment. The

storage option you choose to host your virtualized application workloads is critically important for a

good end-user experience.

VMware offers a variety of storage options in the vSphere product suite to host virtual workloads.

These storage options are available to host both the VMware hypervisor including the VMs and the user

data for the application running within the virtual machine. These storage options include:

1. Direct Attached Storage (DAS): A typical DAS system consists of one or more data storage devices

directly connected to a computer through a host bus adapter (HBA). These devices can be housed

in the server enclosure or in an external enclosure that is directly connected to one or more

servers. A DAS environment does not have network devices like hubs, switches, or routers. DAS

connections primarily use ATA, SATA or SAS block-based protocols

typically leverage the VMFS file system.

2. Storage Area Network (SAN): A typical SAN consists of a dedicated network of storage devices that

serves one or more consolidated logical units (also known as LUNs) such that the LUNs appear as

locally attached storage devices to the server operating system. A SAN typically has a dedicated

switching fabric independent from the client local area network (LAN). A SAN provides only block-

level abstraction of storage devices. Shared file systems on a SAN use block-level operations to

access the host operating system, or user data. Examples include the Microsoft Windows NT file

system (NTFS) and the Linux third extended file system (ext3). SAN connections primarily use Fibre

Chanel (FC), FC over Ethernet (FCoE) or iSCSI block-based storage networking protocols. VMware

SAN environments typically leverage the VMFS file system.

3. Network Attached Storage (NAS): A typical NAS is a storage device that uses file-based protocols

such as NFS or SMB/CIFS and provides file-level abstraction of storage to the network clients.

Unlike SANs, NAS systems share the client LAN. Applications running on physical or virtual

environments that are connected to NAS devices use file level operations to provide access to user

data. VMware can host virtual workloads on NAS devices using the NFS protocol.

Although Fiber Channel protocol can be used in a DAS device, it is primarily used in a SAN device.

. VMware DAS environments

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