Software Release Date: 06/26/2007
Updated Date: 06/26/2007
This release note documents the version 9.4.1 release of the BIG-IP® WebAccelerator™ module. To review the features and fixes included in this release, see Features and fixes in this release. For existing customers, you can apply the software upgrade to 9.2.x and later. For information about installing the software, see Installing the software.
Note: F5 offers both feature releases and maintenance releases. For more information on our release policies, see Description of the F5 Networks software version number format.
In addition to these release notes, the following user documentation is relevant to this release.
You can find the product documentation and the solutions database on the AskF5 Technical Support web site.
The Configuration utility (graphical user interface) supports the following browsers:
Important: Popup blockers and other browser add-ons or plug-ins may affect the usability of the Configuration utility. If you experience issues with navigation, we recommend that you disable these types of browser plug-ins and add-ons.
This release applies only to the supported platforms listed below; each one provides all minimum system requirements.
If you are unsure of which platform you have, look at the sticker on the back of the chassis to find the platform number.
Important: The installation process for the WebAccelerator module can take up to 20 minutes. If you are installing the WebAccelerator module locally, you can follow the progress on the Management Console.
Important: You cannot install the BIG-IP WebAccelerator module, version 9.4 or later, onto a CompactFlash® media drive; you must install it onto an HD1.1 or HD1.2.
You manage the installation of the BIG-IP WebAccelerator module through the BIG-IP Local Traffic Manager. For specific instructions about how to install the WebAccelerator module, see Chapter 3, Configuration and Maintenance in the Administrator Guide for the BIG-IP® WebAccelerator Module located on the AskF5 Technical Support web site. For information about the BIG-IP Local Traffic Manager, see the BIG-IP Local Traffic Manager version 9.4.1 and TMOS release notes.
This release includes the following new features and fixes.
This release includes the following new feature.
New Daylight Saving Time handling
The Energy Policy Act of 2005, which was passed by the US Congress in August 2005, changed both the start and end dates for Daylight Saving Time in the United States, effective March 2007. Canada is also adopting this change. The resulting changes have been addressed in this version of the product software. To find out more about this issue, refer to Solution 6551: F5 Networks software compliance with the Energy Policy Act of 2005.
This release includes the following fixes.
SNAT Automap feature and redundant systems with accelerated virtual servers (CR73433)
On redundant systems that use the SNAT Automap feature, accelerated virtual servers no longer cause some client sessions to fail.
Accelerated resources and load balancing (CR75534)
When the system receives requests for accelerated resources, the system now performs load balancing on a per-request basis. Previously, the system performed load balancing on a per-connection basis.
System performance and memory allocation (CR78910)
In this release, we have modified the parameters for the minObjectSizeForHds and newObjectCacheRatio objects to improve system performance.
The current release includes the fixes and enhancements that were distributed in prior releases, as listed below. (Prior releases are listed with the most recent first.)
The 9.4 release included the following features.
The 9.4 release introduced the BIG-IP® WebAccelerator module for the BIG-IP Local Traffic Manager. The Web Accelerator module is designed to accelerate web applications by changing the web browser's behavior and interaction with the web application, and reducing traffic to the web application servers by compressing and caching dynamic and static content.
The WebAccelerator module also provides the following benefits.
This WebAccelerator module release includes the following pre-defined policies:
Browser behavior control
Without requiring changes to the browser, the WebAccelerator module ensures that users do not download duplicate content.
The WebAccelerator module provides content acceleration by:
Reports and logs
The WebAccelerator module provides:
The 9.4 release contained no fixes specific to the release.
This release contains the following known issues.
Using iRules on a BIG-IP system with the WebAccelerator module enabled (CR69429)
When the WebAccelerator module is licensed and enabled on a BIG-IP system, persistence based on JSESSIONID in an iRule does not work properly.
Help and Main tabs on the Policy Editor screen (CR62954)
The Help and Main tabs do not currently display on the Policy Editor screen. F5 Networks plans to include the Help and Main tabs in a future release. For information about the Policy Editor, see the Policy Management Guide for the BIG-IP® WebAccelerator Module.
Processing requests for unmapped hosts (CR66958)
If you configure the WebAccelerator module to process unmapped hosts and then disable this feature, the WebAccelerator module continues to process unmapped hosts. To work around this issue, you must delete the HTTP profile and recreate it. See Deleting and recreating an HTTP class profile in the Workaround for known issues section.
Renaming log formats (CR68098)
When renaming an existing log format, the WebAccelerator module does not return an error message if you use invalid characters or a name that already exists.
Time zone field in the preview log format screen (CR68100)
The preview log format screen currently displays a reference to the time zone. F5 Networks plans to remove this time zone reference in a future release of the WebAccelerator module, since all time zone calculations are performed on the BIG-IP system.
Assigning an HTTP profile (CR69598)
When you assign an HTTP class profile to a virtual server that targets another virtual server, the X-PvInfo response header incorrectly displays two values, rather than one.
Exporting unpublished policies (CR70454)
If you attempt to export an unpublished, development copy of an acceleration policy and incorrectly select Published Policies from the Export menu on the Export Policy screen, the Export Policy screen refreshes without the policy name displayed.
Invalidating specific cached content for applications (CR71137)
If you attempt to configure invalidation for certain cached objects by specifying a URI expression on the Invalidate Content screen, the WebAccelerator system invalidates all of the cached content for the application, rather than the content that you specified.
Performance reports for normalized documents (CR73085)
The Traffic performance report displays inconsistent information for documents that the WebAccelerator module has normalized.
Sorting Content performance reports by content size (CR73086)
The Content performance report currently displays output only alphabetically, and not by content size.
Data displayed for Average Response Time by Transaction performance report (CR73087)
The Average Response Time by Transaction Type data incorrectly displays in the Average Response Time by Content Type performance report.
The following section describes the workaround for the corresponding known issue listed in the previous section.
If you configured the WebAccelerator module to process unmapped hosts and then later disable the feature, you must delete and recreate the HTTP class profile so that the WebAccelerator module does not continue to process unmapped hosts.
To delete the HTTP class profile
To recreate an HTTP class profile with the WebAccelerator module enabled
Note: The HTTP class profile exists in both the WebAccelerator and the Local Traffic sections of the Configuration utility. The difference between the two is that in the WebAccelerator section of the Configuration utility, the WebAccelerator system is enabled by default. In the Local Traffic section of the Configuration utility, you must check the Custom check box and explicitly enable the WebAccelerator module. If you create the HTTP class profile from the Local Traffic menu and you do not enable the WebAccelerator module, you effectively disable web acceleration for the associated virtual server.