Brocade Network Advisor SAN + IP User Manual v12.3.0 - Manual (Page 1323)

Brocade Network Advisor SAN + IP User Manual 1251
53-1003155-01
Configuring FCIP tunnel advanced settings
27
Enabling Open Systems Tape Pipelining
Latency introduced by a long distance IP connection can negatively impact tape I/O performance.
Open Systems Tape Pipelining (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 box. OSTP options are
available on the Transmission tab.
To enable OSTP, complete the following steps:
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.
NOTE
For the Brocade 7840, the Tape Accelartion list contains Disabled, Write-only, and Read/Write
options.
3. Select the Tape Acceleration check box.
4. Click OK.
Enabling Tperf test mode
To enable Tperf test mode, complete the following steps:
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 Quality of Service (QoS) priority percentages from the preset
default values of 50 percent (High), 30 percent (Medium), and 20 percent (Low). Values for the
three priority levels must equal 100 percent. A minimum of 10 percent is required for each level.
You can adjust percentages in increments of 1 percent. To configure QoS percentages, complete
the following steps:
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.