HP StorageWorks 4/64 Brocade Fabric OS Administrator's Guide v6.3.0 (53-100133 - Page 496
Allocating buffer credits for F_Ports, Displaying the remaining buffers in a port group, Long-Distance
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20 Buffer credit management NOTE This formula does not work with LD mode because LD mode checks the distance and limits the estimated distance to the real value of 100 km. LS mode allows for the necessary desired_distance based on the data size entered, regardless of the distance. If buffer credit recovery is enabled, Fabric OS supports a BB_SC_N range of 1 to 15; therefore, it is impossible for the desired_distance to be more than the number of BB credits available in the pool as determined by the calculations above. The BB credit recovery supported distance is well within the range of all possible connections. An estimated distance of 32,768 is considerably higher than the available BB credits and only lower values of desired_distance would be permitted by Fabric OS. 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. Note that in the sample commands provided in the following procedure, 12 buffers are configured for an F_Port. 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 To disable the port buffer configuration and return to the default buffer allocation: switch:admin> portcfgfportbuffers --disable 2/44 NOTE The configured number of buffers for the given port is stored in the configuration database and is persistent across reboots. The F_Port buffer feature does not support EX_Port, Port Mirroring, Long-Distance, L_Port, Fast Write, QoS, and Trunk Area enabled ports. Displaying the remaining buffers in a port group 1. Connect to the switch and log in using an account assigned to the admin role. 2. Enter the portBufferShow command. switch:admin> portbuffershow 1 User Port Lx Max/Resv Port Type Mode Buffers ---- ---- ---- ------- 0 U - 8 1 U - 8 2 U - 8 3 U - 8 4 U - 8 5 U - 8 6 U - 8 7 U - 8 8 U - 8 9 U - 8 10 U - 8 11 U - 8 Buffer Needed Usage Buffers 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - Link Remaining Distance Buffers 454 Fabric OS Administrator's Guide 53-1001336-01
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