Disabling Restrictions On Oversubscription Ratios - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Configuring Generation 2 Module Interface Shared Resources
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
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fc8/7
fc8/8
fc8/9
fc8/10
fc8/11
fc8/12
...
When disabling restrictions on oversubscription ratios, all ports in shared mode on 48-port and 24-port
4-Gbps Fibre Channel switching modules must be shut down. When applying restrictions on
oversubscription ratios, you must take shared ports out of service.
When restrictions on oversubscription ratios are disabled, the bandwidth allocation among the shared
Note
ports is proportionate to the configured speed. (If the configured speed is auto, then bandwidth is
allocated assuming a speed of 4 Gbps.) For example, if you have three shared ports configured at 1, 2,
and 4 Gbps, then the allocated bandwidth ratio is 1:2:4. In Cisco SAN-OS Release 3.0 and later (or when
restrictions on oversubscription ratios are enabled), port bandwidths are allocated in equal proportions,
regardless of port speed, so, the bandwidth allocation for the same three ports mentioned in the example
would be 1:1:1.

Disabling Restrictions on Oversubscription Ratios

Before disabling restrictions on oversubscription ratios, ensure that you have explicitly shut down shared
ports. To disable restrictions on oversubscription ratios on a 48-port or 24-port 4-Gbps Fibre Channel
switching module, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# no rate-mode
oversubscription-limit module 1
Step 3
switch(config)# exit
Step 4
switch# copy running-config startup-config
Use the show running-config command to view oversubscription ratios for a module. If
oversubscription ratios are enabled, then no restriction appears in the output.
Example 14-1 Module with Restrictions on Oversubscription Ratios Disabled
switch# show running-config
version 3.1(1)
...
no rate-mode oversubscription-limit module 2
interface fc2/1
switchport speed 2000
Cisco MDS 9000 Family CLI Configuration Guide
14-28
Chapter 14 Configuring Generation 2 Switches and Modules
16 4.0 dedicated
16 4.0 dedicated
16 4.0 dedicated
16 4.0 shared
16 4.0 shared
16 4.0 shared
Purpose
Enters configuration mode.
Disables restrictions on oversubscription ratios for a
module.
Note You must enter this command separately for
each module for which you want to remove
the restrictions.
Exits configuration mode.
Saves the new oversubscription ratio configuration
to the startup configuration, and then the new
configuration is enforced upon subsequent reboots
of the module.
OL-16184-01, Cisco MDS SAN-OS Release 3.x