Qlogic QLE2740L-DEL, Руководство пользователя

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3–Fibre Channel Configuration
Configuring Virtual Ports (NPIV)
49 BK3254601-00 C
The physical port or WWN always has high priority, independent of the bandwidth
or priority scheme chosen for created virtual ports. You need not assign a QoS
level to every virtual port that you create. If a QoS level is not assigned to a virtual
port, the default is low priority (best effort), independent of the bandwidth or
priority scheme. This flexibility allows you to focus on critical applications to
ensure that the highest service level is provided. You can modify QoS levels for
virtual ports using QConvergeConsole CLI.
To modify QoS levels, the configuration must meet the following hardware and
software requirements:
 Server operating system: Microsoft
®
Windows Server 2008 or later
 Server support for MSI-X
 A QLogic 2700 Series Adapter
 Latest version of the QLogic STOR miniport driver, available from
http://support.dell.com
 Fibre Channel switch that supports NPIV
 Physical port attached in a point-to-point connection
Setting QoS by Bandwidth
Setting the QoS by bandwidth allocates up to 80 percent of the physical port’s
bandwidth to its virtual ports. The remaining 20 percent is reserved to handle
non-QoS applications and virtual ports.
Setting QoS by bandwidth guarantees bandwidth for each virtual port and to the
application or virtual machine (VM) associated with that virtual port. The proper
QoS setting can prevent bottlenecks that occur when VMs contend for port
bandwidth.
Consider how much bandwidth is required to maximize application or VM
performance and set the QoS level to 105 percent of that value. For example, if a
mission-critical application on a VM requires 1Gb of bandwidth to transmit its data
over the fabric, QLogic recommends a 1.05Gb bandwidth for the virtual port.
Alternatively, you can set the virtual port QoS values as a percentage of the total
available bandwidth.
NOTE
Setting QoS by bandwidth guarantees a minimum bandwidth to a virtual
port, but not a maximum limit. If the application or virtual port requires more
bandwidth than the QoS bandwidth value allows and the physical port has
available bandwidth, the application receives the additional bandwidth. The
port allocates additional bandwidth on demand up to the port capacity or
until there is contention for bandwidth among the virtual ports.