Troubleshooting guide

1-27
Cisco Wide Area Application Services Configuration Guide
OL-26579-01
Chapter 1 Configuring Application Acceleration
Enabling and Disabling the Global Optimization Features
• ADS Negative Cache—Applications sometimes send requests for directories and files that do not
exist on file servers. For example, Windows Explorer accesses the Alternate Data Streams (ADS) of
the file it finds. With ADS Negative caching, the full paths to those nonexistent directories and files
are cached so that further requests for the same directories and files get local denies to save the
round-trips of sending these requests to the file servers.
To enable CIFS accelerator express, check the CIFS Accelerator Express check box in the Enabled
Features window.
To configure the CIFS accelerator express settings, follow these steps:
Step 1 From the WAAS Central Manager menu, choose Devices > device-name (or Device Groups >
device-group-name).
Step 2 Choose Configure > Acceleration > CIFS Settings.
The CIFS Optimization Bypass Settings window appears.
Step 3 Check the Write Optimization check box to enable the write optimization by speeding up the write
responses to the client. This box is checked by default
Step 4 Check the Read Ahead Optimization check box to enable CIFS accelerator express to optimize the
quantity of read-ahead data from the file. CIFS accelerator express performs a read-ahead optimization
only when the file is opened using the ops lock feature. This box is checked by default.
Step 5 Check the ADS Negative Cache check box to enable caching pathnames of files not found. This box is
checked by default.
Step 6 Click Submit to save the changes.
To configure CIFS accelerator express from the CLI, use the accelerator cifs global configuration
command.
Configuring ICA Acceleration
The ICA application accelerator provides WAN optimization on a WAAS device for ICA (Independent
Computing Architecture) traffic which is used to access a virtual desktop infrastructure (VDI). This is
done through a process that is both automatic and transparent to the client and server.
ICA acceleration is enabled on a WAAS device by default.
To enable the ICA accelerator, check the ICA Accelerator check box in the Enabled Features window
(see Figure 1-13 on page 1-28).
To configure the ICA acceleration settings, follow these steps:
Step 1 From the WAAS Central Manager menu, choose Devices > device-name (or Device Groups >
device-group-name).
Step 2 Choose Configure > Acceleration > ICA Settings.
The ICA Acceleration Configuration window appears. (See Figure 1-11.)