Dell Brocade VDX 6740 Configuratiehandleiding - Pagina 9
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Performance Tuning
In our testing of VDX 6740 with EqualLogic and using asymmetric flow control i.e. TX off RX on, the
default buffer allocation of 280KB per port per queue didn't yield optimum throughput and significant TCP
retransmits were observed. But NOS version 5.0.1 has additional knobs to fine tune the buffers and add
additional buffer per port per queue. The following section shows how to configure the receive and
transmit buffers. Our testing indicated the optimal setting as 2MB for receive queue and 2MB for transmit
queue per port.
sw0# configure
Entering configuration mode terminal
sw0(config)# rbridge-id 1
sw0(config-rbridge-id-1)# qos tx-queue limit 2000
sw0(config-rbridge-id-1)# qos rcv-queue limit 2000
sw0(config-rbridge-id-1)# exit
sw0(config)#
Note: Repeat the commands to configure the buffer on the second switch.
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SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs