Unsuccessful Config of MA111 USB Wireless Adapter on Fedora

After a second reading of the instructions for configuring the kernel module and wlan-ng drivers for the MA111 USB Wireless Adapter on Fedora Core 1 Linux, I've discovered that I have an athlon kernel, whereas I assumed that I had a i686 kernel and CPU. Choosing the appropriate RPMs for the athlon kernel permitted the packages to install cleanly without any warnings.

However, after booting, when I plug in the USB device, the system freezes and the lights on the keyboard start flashing. I can't get to a virtual console with CTRL-ALT-F2, and all I can do is push the big red button to restart. If I leave the USB device plugged in during a boot, the system freezes again just after printing this during the startup sequence:

Stack: {lots of memory addresses}
Call Trace: usb_free_devR8bf51c4a
process_urb [usbcore]
Code: {lots of digit pairs here}
Kernel panic: Aiee, killing interrupt handler!
In interrupt handler not synching


Sticky Session Breakage and Above Session is Broken

Two misleading error messages are logged to Apache's error_log when using clustered CFMX 6.1 servers on JRun.† These errors are written when a session is continued after it has been failed over and replicated on another cluster member.† When the failed session recovers and the session is mapped back to the original server, the error messages cease to be recorded for that session id.

[notice] jrApache[26641] Sticky session breakage, a host for serving session 8e30545211077910861640TR not available.
[notice] jrApache[26641] Failing over to another server, but above session is broken

The message "Sticky session breakage, a host for serving session {jsessionid} not available" means that the originating host for the server is not available, as would be expected in a failover condition. The connector is just informing us of the failover event and that the session is no longer sticking to the original server instance.

The message "Failing over to another server, but above session is broken" is either just wrong or had a meaning to the author of the error message different from the apparent meaning. In other words it states that the session is broken, but this is not true in the sense that the server instance did failover and the session was replicated.

A bug is opened to reduce or eliminate these messages because session replication works just fine even as they are being logged.† They can be safely ignored in the mean time.

Red Hat has launched WIDE OPEN Magazine

Red Hat has launched WIDE OPEN Magazine, a technical magazine for open source professionals and advocates. The magazine will feature a range of topics, from technical information to thought-provoking editorials about the future of open source. WIDE OPEN will collaborate with other industry leaders and Red Hat partners to bring subscribers a variety of views and opinions.

The Red Hat Magazine is currently available in Italy, Germany, and France. Starting in 2004, Red Hat, Inc. and bmind, LLC are offering the Wide Open Magazine, a Red Hat magazine. The Premiere edition of the US magazine will be available in March 2004. If you subscribe now, you will receive a System Administration CD as a free gift. A subscription includes 6 magazines a year and 3 CDs of open source software such as Fedora Core 1 with every issue. A preview of one of the articles is available online.

No Frills Guide To Clustering Multiple Instances of CFMX with Failover and Session Replication

I've learned how to cluster multiple instances of CFMX 6.1 on JRun4 by reading Brandon Purcell's various articles and blog entries, including how to do session replication and sticky sessions. I've found that I've had to set up various clusters from scratch from time to time, and I've put together a quick and dirty stepwise instruction set for how to configure a cluster for failover and session replication. This is a distillation of what I've learned from Brandon's more comprehenseive articles.


Server Error - IO error on server communication

Server Error pop-up alertClicking the Browse Server button in the ColdFusion MX 6.0/6.1 Administrator while RDS is disabled will cause a pop-up alert as shown here. The Browse Server button is part of an Applet built into the Administrator and is used for a variety of tasks, such?as selecting?the appropriate *.mdb file when creating an Microsoft Access Database Datasource from the CF Admin. If RDS was selected to be disabled during the post-installation configuration wizard, a recommended practice for production servers, then the Browse Server functionality will not work from the ColdFusion Administrator. There is no workaround other than to re-enable RDS in the deployment descriptor web.xml, found at{CF_HOME}/wwwroot/WEB-INF/web.xml. Refer to this document for how to enable/disable RDS. This issue is available as a TechNote.

New Book: ColdFusion Lists, Arrays, and Structures - by Jeff Peters

Jeff Peters announced his new book on the CFTalk list today, ColdFusion Lists, Arrays, and Structures. I believe that this is one of the few books that tackle specific facets of the CFML Language, rather than the language and the server as a whole.

The book has positive reviews from ColdFusion pundits such as Hal Helms. Jeff is trying keep the cost low by not distributing on Amazon.com, and I'll try to help out by further broadcasting this new book here.

Read an excerpt [PDF].

I once tackled this topic myself shortly after CFMX was released, which was later blogged as "MX Compatibility Summary On Structure & Sorting Usage" on CFGURU.

Molecular Biology and IT Classes at Harvard Extension School

The Harvard Extension School offers a great selection of courses in both Biology and Computer Science, making a great combination of classes to help ramp up on Bioinformatics. Having been working in IT for 4+ years now, I've been growing rusty on my Biology skills and knowledge, and in an effort to refresh myself and make some gains towards my interest in Bioinformatics I've decided to take a couple courses this semester.

Starting tomorrow, I'll be taking Principles of Genetics and Biochemistry II, on Monday evenings. In addition, I'll be adding to my programming skills with XML with J2EE on Thursday nights.

Thinking ahead a bit, this sequence might be well followed by the Genomics and Computational Biology and Introduction to Proteomics in for the Fall semester, and then Web Services in the Spring of 2005.

On a related note, the Bio-IT World Expo will be held in Boston again, March 30 - April 1, at the Hynes Convention Center. Although I have attended some of the past I3C meetings, I feel that I'm still a bit premature to get much out of this year's conference. I think I'll be better prepared to attend the expo in 2005.

Ten years ago I completed Neurobiology, Signal Transduction, and Molecular Biology at the Harvard Extension School, and more recently a Java course. I feel that enables me to make a fair comparison. I elieve that the quality of courses at Harvard, with regard to both the faculty and facilities, is superior to any of the other local universities also catering to the continuing education crowd. I especially enjoyed the MolBio class by David Dressler at Harvard. Dr. Dressler was especially articulate, comfortable, and knowledgeable in front of the class, although I don't see any courses benefiting from his instruction in recent semesters.

At Brandeis, I took an Intro to XML course, an Advanced Java course, and a Cell Biology course, and only the XML course met my expectations for faculty, and all of them fell way short in my expectations for quality of facilities. All of the CS courses at Brandeis@Night are held in a single deteriorating building with poor HVAC, kindergarten-like wooden chairs, and sardine-like seating arrangements. My advice is to avoid Brandeis if at all possible.

Novell Moves Headquarters to Waltham, MA

I'm excited to see that Novell is moving their corporate headquarters to Waltham, MA, just a couple miles up the road from our Macromedia office in Newton, MA.† Hopefully this will drive up the local interest in Linux, now that Novell has acquired Suse, and perhaps bring a new pool of speakers to the Boston Linux and Unix group (BLU).† Novell acquired Ximian a while back, and their offices are in Kendall Square, Cambridge, MA.† Ximian is a popular suite of Linux tools for the desktop.† It would be great if Novell offered Linux training and certification in the Waltham office, and with Red Hat not too far away in Westford, MA I'd like to see competition between the two†bringing down the cost of training classes.† I'm still itching for a RHCE, but a Suse cert would fit right in too!

News on the move to Waltham: