Dell Brocade 6520 Administrator's Guide Supporting Fabric OS 7.1.0 - Page 402
Changing port speed on encryption/compression enabled ports
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14 Configuring encryption and compression Changing port speed on encryption/compression enabled ports The port speed values can be displayed through several commands, including portStatsShow, portEncCompShow, and portCfgSpeed. However, the port speed can only be changed using the portCfgSpeed command. If the port speed is configured as AUTO NEG, the speed of the port is taken as 16G for calculation purposes. We recommend that you configure to the ports to a specific speed before enabling encryption/compression. See "Configuring encryption and compression" on page 399 for more details. You can change the port speed on any port which has encryption or compression enabled with the portCfgSpeed command. When you attempt to change speed on a port which has encryption or compression enabled, a validation alert appears. If the capacity is available, the port will be allowed to be configured with the new speed. If there is not enough capacity available, an error message will appear, and you will not be able to change the port speed. See the Fabric OS Command Reference for more details on this command. Example Port speed change failure switch> portenccompshow User Encryption Compression Port configured Active Configured 0 No No Yes 1 No No Yes 2 No No Yes 3 No No Yes 4 No No Yes Config Active Speed ------ ----- No 4G No 4G No 8G No 16G No 16G switch> portcfgspeed 1 0 Configuration for port (1) failed as it exceeds current supported capacity. Compression ratios and encryption/compression enabled ports The compression ratio value is recalculated every 5 seconds, and is the ratio between the accumulated original length and the compressed length of the data over the previous 5 seconds. When a port is configured for compression, entering portStatsShow displays the port's compression ratio. See the Fabric OS Command Reference for more details on this command. Limitations and restrictions • The ASIC Compression Block can compress data only if there is at least 3 bytes of data. • The value shown by portStatsShow is a five-second average. Your results will depend on the pattern of the payload data. • The average frame size reported by portCfgShow is the configured framesize, that is, what was input using portCfgLongdistance on the CLI. • The portBufferShow command shows the average framesize for both received (rx) and transmitted (tx) frames. The rx values are after compression and the tx values are before compression. 402 Fabric OS Administrator's Guide 53-1002745-02
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