Dell C9000 series, Reference Manual

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dcb pfc-total-buffer-size
Configure the total buffer size for PFC in kilobytes.
C9000 Series
Syntax
dcb pfc-total—buffer—size KB
Parameters
KB Enter a number in the range of 0 to 7787.
Default The default is 1 KB for S6000 platforms.
Command Modes CONFIGURATION mode
Command History
Version Description
9.9(0.0) Introduced on the C9010.
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S6000 platform.
Usage Information Configure the maximum buffer available for PFC traffic. You can choose to increase or
decrease the buffer size that is currently allocated in the system by default. However, if
you modify the PFC buffer size to be lower than the previously configured PFC buffer
size, the system determines whether this reduction in size is valid without disrupting the
existing configuration. In such a scenario, you must disable and re-enable DCB. For
example, if you modify the total buffer size to be 4000 KB from the previous size of
5000 KB, an error message is displayed that this reduction cannot be performed owing
to existing system configuration because of queues that are being currently processed.
The lossless queue limit per port is validated based on the
dcb pfc-queues
command. PFC queue configuration identifies the maximum number of queues a port
can support. Although the queue limit per port is a baseline when dynamic buffering is
enabled, the limit per port for queues depends on the availability of the buffer.
Example
Dell(conf)#dcb pfc-total-buffer-size 5000
Dell(conf)#dcb pfc-total-buffer-size 4000
%ERROR: Total pfc buffer size configured cannot accommodate
existing buffer requirement in the system.
Data Center Bridging (DCB) 737