Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 690

dcb pfc-total-buffer-size Configure the total buffer size for PFC in kilobytes. C9000 Series Syntax Parameters dcb pfc-total-buffer-size KB 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. 690 Data Center Bridging (DCB)