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Another commonly encountered issue is wrong or old managed preferences data on a particular machine. Remember that in this configuration you are storing managed preferences data in a node of the local directory service. In other words, the data is just .plist files in directories under /private/var/db/dslocal/nodes/. So the most common reason for wrong or old MCX data is that updated versions of these .plist files have not been pushed out to the current machine via whatever file/software delivery mechanism you have: Puppet, Radmind, ARD, a package-based installer, or whatever. Or, equally likely, you have old data here that used to be managed, but that has been forgotten or abandoned.

iPhoto and other media management applications involve not only high levels of I/O requests, but they can also be throughput intensive when used with higher quality or uncompressed media Another class of horrible offenders are video editors, as they require a consistent, uninterrupted data stream While most high-end applications of this variety rarely use the home directory for media storage, the nearly ubiquitous iMovie does Even at its lowest quality, DV media played in iMovie requires a 5MBps stream, and things get worse with HD formats The main thing to understand is that if your user s standard usage patterns involve high I/O or high bandwidth activities, the viability of network-based storage deteriorates However, their exclusion shouldn t be a forgone conclusion Redirection is the process of utilizing symbolic links in a network home directory to redirect traffic to a local disk.

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The basic idea of the rich user interface portal that uses Ajax to interact with the server sounds difficult, but you will be amazed at how simple it is to implement the project. The portal architecture illustrated in figure 11.4 contains two major portions: the initial login and the dynamic interaction with the windows. Thus, we can break our processes into two different sections and adapt the Ajax functionality to meet those needs. The first operation validates a user s credentials against a database, and the second operation interacts with DHTML elements and returns values to our client. In this chapter, we use a DHTML library to handle a lot of the client-side code. The DHTML library allows us to develop customizable windows that use IFrames to display content. The DHTML windows created by this library can be positioned anywhere on the page since the library supports dragging functionality. Another feature the library supports is resizing of the windows, so we can make the window any size we want. The DHTML library frees us from dwelling on the cross-browser problems that we might encounter with these actions. Instead we can focus on adding the Ajax technology into this library to make a dynamic script even more powerful by integrating it with the server. The implementation that we ll present here uses Java on the server side, simply to provide a little variety from the previous two chapters, which used .NET languages. We ve kept the implementation fairly simple. Because Ajax can work equally well against any server-side technology, we won t concentrate on the server-side details. The full source code for the server tier is available as part of the download for this book. Let s start off by introducing the Ajax login.

For instance, if your users utilize IMAP mail (you re not using POP, right ) then there s no reason to let that traffic burden your server Through redirection, you establish a symbolic link at ~/Library/Mail which redirects traffic to a local path of your choosing, say /Users/theUser/Library/Mail This way, whenever you start up mail, all of your data will be accessed off of your local disk When a user migrates to another machine and opens up mail, it will need to re-download any messages, but this will be of minor consequence compared to the alternative The typical candidate for redirection is ~/Library/Caches, which contains a decent amount of application cache data that has no business burdening your server The use of this folder was slightly mitigated with the introduction of 10.

The first action we need to take care of is the login procedure to access our portal. To do this, we create the database table, the server-side code to handle the request, and the client-side code that obtains the login information from the user and processes the request. The first step is to design our user table in the database.

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