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run fsck Think how much faster you could recover a system if you didn t have to run fsck on a 1 TB disk! (Haven t had to run fsck on a big disk before Think about how long it takes to run ScanDisk under Windows on large disks) Other benefits of using journaling-type file systems are that system reboots are simplified, disk fragmentation is reduced, and input/output (I/O) operations can be accelerated (this depends on the journaling method used) If you want to learn more about the ext2 file system, we recommend that you read the latest edition of the book titled Linux Kernel Internals, edited by Michael Beck (AddisonWesley, 1998) Although the book is dated in many aspects in terms of advancement in the Linux kernel, the parts about the ext2 file system still hold true, since ext2 is the base of the ext3 file system

HTTP is a stateless protocol Each request is independent of the previous one However, in some applications, it is necessary to save state information so that information can be collected from several interactions between a browser and a server Sessions provide such a mechanism A session can be created via the getSession( ) method of HttpServletRequest An HttpSession object is returned This object can store a set of bindings that associate names with objects The setAttribute( ), getAttribute( ), getAttributeNames( ), and removeAttribute( ) methods of HttpSession manage these bindings It is important to note that session state is shared among all the servlets that are associated with a particular client The following servlet illustrates how to use session state The getSession( ) method gets the current session A new session is created if one does not already exist The getAttribute( ) method is called to obtain the object that is bound to the name date That object is a Date object that encapsulates the date and time when this page was last accessed (Of course, there is no such binding when the page is first accessed) A Date object encapsulating the current date and time is then created The setAttribute( ) method is called to bind the name date to this object

import import import import javaio*; javautil*; javaxservlet*; javaxservlethttp*;

You might be asking by now, Which file system should I use As of this writing, the current trend is to shift toward any file system with journaling capabilities As with all things Linux, the choice is yours Your best bet is to try many file systems and see how they perform with the application you are using the system for Just keep in mind that journaling has its own overhead

public class DateServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

Part III:

The process of managing file systems is trivial that is, the management becomes trivial after you have memorized all aspects of your networked servers, disks, backups, and size requirements, with the condition that they will never again have to change In other words, managing file systems isn t trivial at all Once the file systems have been created, deployed, and added to the backup cycle, they do tend to take care of themselves for the most part What makes them tricky to manage are the administrative issues such as users who refuse to do housekeeping on their disks, and cumbersome management policies dictating who can share what disk and under what conditions, depending, of course, on the account under which the storage/disk was purchased, and (It sounds frighteningly like a Dilbert cartoon strip, but there is a good deal of truth behind that statement) Unfortunately, there s no cookbook solution available for dealing with office politics, so in this section, we ll stick to the technical issues involved in managing file systems that is, the process of mounting and unmounting partitions, dealing with the /etc/fstab file, and performing file-system recovery with the fsck tool

// Get the HttpSession object HttpSession hs = requestgetSession(true); // Get writer responsesetContentType("text/html"); PrintWriter pw = responsegetWriter(); pwprint("<B>"); // Display date/time of last access Date date = (Date)hsgetAttribute("date"); if(date != null) { pwprint("Last access: " + date + "<br>"); } // Display current date/time date = new Date(); hssetAttribute("date", date); pwprintln("Current date: " + date); } }

When you first request this servlet, the browser displays one line with the current date and time information On subsequent invocations, two lines are displayed The first line shows the date and time when the servlet was last accessed The second line shows the current date and time