Lenovo Flex System Fabric CN4093, Инструкция по применению

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© Copyright Lenovo 2017 Chapter 21: Unified Fabric Port
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UFP Strict Bandwidth Provisioning mode
Strict bandwidth provisioning mode configures the switch and NIC apply
bidirectional bandwidth control on the vPort as per the defined configuration. By
default, a bandwidth of 2.5 Gbps per vPort is guaranteed. If other vPorts are idle,
the bandwidth of a vPort can be up to 10 Gbps. A minimum bandwidth of 1 Gbps
is provisioned, which can be raised by 100 Mbps increments. The sum of the
minimum bandwidth guaranteed for all vPorts together cannot exceed the
capacity of the physical link. A vPort can also be configured with a maximum
bandwidth.
This mode works with the port scheduler to avoid unintended packet drops due to
policing through EFP metering block. If flow control is enabled, the switch
provides a no ‐ drop packet forwarding behavior, which improves end ‐ to ‐ end
TCP ‐ throughput performance.
Note:
If a vPort is configured with low upper limit, it might lead to head ‐ of ‐ line
congestion on the egress port.
ETS mode is disabled when strict bandwidth provisioning mode is enabled. By
default, uplink ports have a separate traffic class for storage traffic with guaranteed
bandwidth. The rest of the bandwidth is shared equally among other traffic.
Use the following commands to configure strict bandwidth provisioning:
1.
Enable UFP Strict Bandwidth Provisioning mode on a specific port:
2.
Configure the bandwidth settings for a specific vPort:
Note:
Total minimum guaranteed bandwidth of enabled vPorts on a physical
switch port needs to be 100%.
CN 4093(config)# ufp port
<port alias or number>
qos-mode bw
CN 4093(config)# ufp port
<port alias or number>
vport
<1 ‐ 8>
CN 4093(config_ufp_vport)# qos bandwidth {max|min}
<10 ‐ 100>
min - Sets minimum guaranteed bandwidth
max - Sets maximum allowed bandwidth