vSphere Storage - ESXi 5.1 - Documentation - VMware
vSphere Storage - ESXi 5.1 - Documentation - VMware
vSphere Storage - ESXi 5.1 - Documentation - VMware
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Configuring Fibre Channel <strong>Storage</strong> 4<br />
When you use <strong>ESXi</strong> systems with SAN storage, specific hardware and system requirements exist.<br />
This chapter includes the following topics:<br />
n “<strong>ESXi</strong> Fibre Channel SAN Requirements,” on page 39<br />
n “Installation and Setup Steps,” on page 40<br />
n “N-Port ID Virtualization,” on page 41<br />
<strong>ESXi</strong> Fibre Channel SAN Requirements<br />
In preparation for configuring your SAN and setting up your <strong>ESXi</strong> system to use SAN storage, review the<br />
requirements and recommendations.<br />
n Make sure that the SAN storage hardware and firmware combinations you use are supported in<br />
conjunction with <strong>ESXi</strong> systems. For an up-to-date list, see the <strong>vSphere</strong> Compatibility Guide.<br />
n Configure your system to have only one VMFS volume per LUN.<br />
n Unless you are using diskless servers, do not set up the diagnostic partition on a SAN LUN.<br />
In the case of diskless servers that boot from a SAN, a shared diagnostic partition is appropriate.<br />
n Use RDMs to access raw disks. For information, see Chapter 18, “Raw Device Mapping,” on page 179.<br />
n For multipathing to work properly, each LUN must present the same LUN ID number to all <strong>ESXi</strong> hosts.<br />
n Make sure the storage device driver specifies a large enough queue. You can set the queue depth for the<br />
physical HBA during system setup. For information on changing queue depth for HBAs and virtual<br />
machines, see the <strong>vSphere</strong> Troubleshooting documentation.<br />
n On virtual machines running Microsoft Windows, increase the value of the SCSI TimeoutValue parameter<br />
to 60. This increase allows Windows to better tolerate delayed I/O resulting from path failover. For<br />
information, see “Set Timeout on Windows Guest OS,” on page 197.<br />
<strong>ESXi</strong> Fibre Channel SAN Restrictions<br />
When you use <strong>ESXi</strong> with a SAN, certain restrictions apply.<br />
n <strong>ESXi</strong> does not support FC connected tape devices.<br />
n You cannot use multipathing software inside a virtual machine to perform I/O load balancing to a single<br />
physical LUN. However, when your Microsoft Windows virtual machine uses dynamic disks, this<br />
restriction does not apply. For information about configuring dynamic disks, see “Set Up Dynamic Disk<br />
Mirroring,” on page 175.<br />
<strong>VMware</strong>, Inc. 39