HP 9124 - Cisco MDS Fabric Switch, Руководство по настройке

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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
14-10
Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 14 Configuring Generation 2 Switches and Modules
Buffer Credit Allocation
•
BB_credit buffers for ISL connections can be configured from a minimum of 2 buffers to a
maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
• BB_credit buffers for Fx port mode connections can be configured. The minimum is 2 buffers and
the maximum of 250 buffers for dedicated rate mode or 16 buffers for shared rate mode.
•
Performance buffers are not supported on this module.
Each port group on the 48-port 4-Gbps Fibre Channel switching module consists of 12 ports. The ports
in shared rate mode have bandwidth oversubscription of 4:1 by default. However, some configurations
of the shared ports in a port group can have maximum bandwidth oversubscription of 5:1 (considering
that each port group has 12.8-Gbps bandwidth).
The following example configurations are supported by the 48-port 4-Gbps Fibre Channel switching
modules:
• Twelve ports with shared rate mode and 4-Gbps speed (4:1 oversubscription) (default)
•
One port with dedicated rate mode and 4-Gbps speed plus
11 ports with shared rate mode and 4-Gbps speed (5:1 oversubscription)
• One port with dedicated rate mode and 4-Gbps speed plus
11 ports with shared rate mode and 2-Gbps speed (2.5:1 oversubscription)
•
Two ports with dedicated rate mode and 2-Gbps speed plus
10 ports with shared rate mode and 4-Gbps speed (5:1 oversubscription)
• Two ports with dedicated rate mode and 2-Gbps speed plus
10 ports with shared rate mode and 2-Gbps speed (2.5:1 oversubscription)
•
Twelve ports with dedicated rate mode and 1-Gbps speed
• Three ports with dedicated rate mode and 4-Gbps speed plus
four ports with shared rate mode and 1-Gbps speed plus
five ports put out-of-service (see Figure 14-3 )
Figure 14-3 Example Speed and Rate Configuration on a 48-Port 4-Gbps Switching Module
• Six ports with dedicated rate mode and 2-Gbps speed plus
four ports with shared rate mode and 1-Gbps speed plus
two ports put out-of-service (see Figure 14-4 )
4-Gbps
4-Gbps
4-Gbps
1-Gbps
1-Gbps
1-Gbps
Dedicated
Dedicated
Dedicated
Shared Shared
Shared
1
2
3
4
5 7 9 11
6
8 10
12
1-Gbps
Shared
Out of
Service
Out of
Service
Out of
Service
Out of
Service
Out of
Service
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