Brocade Communications Systems 804 manual Path time out, Target rate limiting

3 Basic port configuration

Enter the following commands to enable or disable QoS support on the HBA side:

•bcu qos --enable<port_id>

•bcu qos --disable<port_id>

•bcu qos --query<port_id>

•bcu qos --stats<port_id>

•bcu qos --statsclr<port_id>

Refer to “qos” on page 155 for details about this command.

Path time out

With path time out values (TOV), you can either force an immediate failover (by setting the TOV to 0) or you can specify a delay in seconds (1-60 seconds). The default TOV is 30.

Specifying path time out using HCM

1.Select Configure > Basic Port Configuration from the Host Connectivity Manager. The Basic Port Configuration dialog box displays.

2.Type a value in the Path Time Out field.

3.Click OK to close the window.

Specifying path time out using the BCU

Enter the following command to specify the optional path time out value in seconds (1 to 60). The default TOV is 10 seconds. A value of 0 is not allowed from the BCU.

bcu fcpim --pathtov<port_id> tov

Refer to “fcpim” on page 143 for details about this command.

Target rate limiting

The target rate limiting feature is used to minimize congestion at the adapter port caused by a slow drain device operating in the fabric at a slower speed. A remote port’s operating speed is determined from the fabric, and then the information is used to throttle the transmitted traffic rate to that remote port. Traffic destined to the remote port is limited to its current operating speed.

Limiting the data rate to slower targets ensures that there is no buffer-to-buffer credit back-pressure between the switch due to a slow-draining target.

26	Brocade Adapters Administrator’s Guide
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