Dell Brocade G620 Brocade 8.0.1 Fabric OS Administratiors Guide - Page 133
Allocating buffer credits for F_Ports, Buffer-to-Buffer Credits and Credit Recovery
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Buffer-to-Buffer Credits and Credit Recovery 1. Connect to the switch and log in using an account assigned to the admin role. 2. Enter the portBufferCalc command and provide values for the distance, port speed, and frame size. The following example calculates the number of buffers required for an 8-Gbps port on a 100-km link with an average frame size of 512 bytes. switch:admin> portbuffercalc 9/4 -distance 100 -speed 8 -framesize 512 1606 buffers required for 100km at 8G and framesize of 512 bytes NOTE The portBufferCalc and portCfgEportCredits are applicable to the 2 km ICL QSFP ports as well. The following examples show calculation of buffers for 2 km ICL ports at 16 Gbps and 32 Gbps: switch_6510:admin> portbuffercalc 1 -distance 2 -speed 16 -framesize 2048 22 buffers required for 2km at 16G and framesize of 2048bytes switch_6510:admin> portbuffercalc 1 -distance 2 -speed 16 -framesize 1024 38 buffers required for 2km at 16G and framesize of 1024bytes switch_6510:admin> portbuffercalc 1 -distance 2 -speed 16 -framesize 512 70 buffers required for 2km at 16G and framesize of 512bytes switch_6510:admin> portbuffercalc 1 -distance 1 -speed 16 -framesize 2048 14 buffers required for 1km at 16G and framesize of 2048bytes switch_6510:admin> portbuffercalc 1 -distance 1 -speed 16 -framesize 1024 22 buffers required for 1km at 16G and framesize of 1024bytes switch_6510:admin> portbuffercalc 1 -distance 1 -speed 16 -framesize 512 38 buffers required for 1km at 16G and framesize of 512bytes switch_G620:admin> portbuffercalc 1 -distance 2 -speed 32 -framesize 2048 38 buffers required for 2km at 32G and framesize of 2048bytes switch_G620:admin> portbuffercalc 1 -distance 2 -speed 32 -framesize 1024 70 buffers required for 2km at 32G and framesize of 1024bytes switch_G620:admin> portbuffercalc 1 -distance 2 -speed 32 -framesize 512 134 buffers required for 2km at 32G and framesize of 512bytes switch_G620:admin> portbuffercalc 1 -distance 1 -speed 32 -framesize 2048 22 buffers required for 1km at 32G and framesize of 2048bytes switch_G620:admin> portbuffercalc 1 -distance 1 -speed 32 -framesize 1024 38 buffers required for 1km at 32G and framesize of 1024bytes switch_G620:admin> portbuffercalc 1 -distance 1 -speed 32 -framesize 512 70 buffers required for 1km at 32G and framesize of 512bytes Allocating buffer credits for F_Ports The default configured F_Port buffer credit is fixed at eight buffers. You can use the portCfgFPortBuffers command to configure a given port with the specified number of buffers. 1. Connect to the switch and log in using an account assigned to the admin role. 2. Enter the portCfgFPortBuffers command. switch:admin> portcfgfportbuffers --enable 2/44 12 Note that in the sample commands provided in the following procedure, 12 buffers are configured for an F_Port. To disable the port buffer configuration and return to the default buffer allocation, use the --disable option. switch:admin> portcfgfportbuffers --disable 2/44 Brocade Fabric OS Administration Guide, 8.0.1 53-1004111-02 133
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