Brocade Communications Systems Network Advisor 12.0.0, User Manual

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Brocade Network Advisor SAN User Manual 783
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Configuring FCIP tunnel advanced settings
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Enabling Open Systems Tape Pipelining (OSTP)
Latency introduced by a long distance IP connection can negatively impact tape I/O performance.
OSTP may be used to improve performance on SCSI write I/Os to sequential devices (such as tape
drives). When OSTP is used, the extension blades or switches emulate write commands and
responses locally to reduce delays caused by latency. Both sides of an FCIP tunnel must have
matching configurations for these features to work. OSTP may be configured by selecting Advanced
Settings on the Add FCIP Tunnel dialog. OSTP options are available on the Transmission tab.
To enable OSTP, do the following:
1. Select Advanced Settings on the Add FCIP Tunnel or Edit FCIP Tunnel dialog box to display the
Advanced Settings dialog box.
2. From the Transmission tab, select the Fast Write check box.
This enables the Tape Acceleration check box.
3. Select the Tape Acceleration check box.
4. Click OK.
Enabling Tperf test mode
To enable Tperf test mode, do the following:
1. Select Advanced Settings on the Add FCIP Tunnel or Edit FCIP Tunnel dialog box to display the
Advanced Settings dialog box.
2. From the Transmission tab, select the TPerf Test Mode check box.
3. Select the Tape Acceleration check box.
4. Click OK.
Tperf test mode should not be enabled during normal operations. It is only used for testing and
troubleshooting tunnels. Refer to the
Fabric OS FCIP Administrator’s Guide for information about
Tperf.
Configuring QoS percentages
For 8 Gbps platforms, you can adjust QoS (Quality of Service) priority percentages from the preset
default values of 50% (High), 30% (Medium), and 20% (low). Values for the three priority levels
must equal 100%. A minimum of 10% is required for each level. You can adjust percentages in
increments of 1%. To configure QoS percentages, do the following:
1. Select Advanced Settings on the Add FCIP Tunnel or Edit FCIP Tunnel dialog box to display the
Advanced Settings dialog box.
2. From the Transmission tab, click the up and down arrows by the QoS (High), QoS (Medium),
and QoS (Low) percentage values to increase and decrease values.