Brocade Communications Systems 415, Administrator'S Manual

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Brocade Adapters Administrator’s Guide 39
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Advanced port configuration
4
Queue Depth configuration
The queue depth is the number of I/O operations that can be run in parallel on a device. When the
queue is full, the drive refuses to accept any additional SCSI commands. The device continues to
refuse new commands until at least one command has been completed, freeing up space in the
queue.
Configuring the queue depth using the GUI
1. Select a port from the device tree.
•
From the Host Connectivity Manager, select Configure > Advanced Port Configuration.
The Advanced Port Configuration dialog box displays.
OR
•
Right-click a port and select Port Configuration > Advanced.
2. Set the queue depth (a value that represents the number of parallel I/O operations).
The valid queue depth range is 0-2000.
3. Click OK.
Configuring the queue depth using the BCU
Enter the following command to set the queue depth.
bcu fcpim - -qdepth < port_id > < q_depth_value >
Refer to “fcpim” on page 177 for details about this command.
Interrupt Control Coalesce
NOTE
The Interrupt Control Coalesce feature is not supported on the converged network adapter (CNA).
Interrupt control coalescing allows the system to change CPU utilization by varying the number of
interrupts generated. Increasing the latency monitor timeout value should result in a lower
interrupt count and less CPU utilization, which may result in higher throughput.