User`s guide
3–Configuring Fibre Channel
Virtual Ports (NPIV)
FC0054609-00 B 3-9
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 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, the recommended bandwidth for the virtual port would be 1.05Gb.
Alternatively, the virtual port QoS values can be set as a percentage of the total
available bandwidth.
When the physical port is partitioned into four virtual ports, the port bandwidth is
divided between the virtual ports according to traffic demands.
The QConvergeConsole lets you set QoS for each virtual port by setting minimum
and maximum percentages of the physical port’s bandwidth for each virtual port.
Using this feature lets you guarantee a transmission rate for each port that
requires a particular bandwidth to run mission-critical applications for business
continuity using virtual ports. The setting for a given QoS can resolve bottlenecks
that exist when VMs contend for port bandwidth.
To set the QoS by bandwidth percentage:
1. Expand a 2600 Series Adapter in the QConvergeConsole system tree.
2. Select a virtual port.
3. Select the QoS tab.
4. On the QoS Type menu, select Bandwidth.
5. On the View By menu, select Bandwidth Percentage.
NOTE
Setting QoS by bandwidth guarantees a minimum bandwidth to a virtual port
but not a maximum limit. If the application/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.