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You can easily resize existing volumes in an LVM environment. It s also possible to create a snapshot of a volume. Let s explore how to do that. Resizing Logical Volumes When resizing logical volumes, you should be aware that the procedure always involves two steps: you need to resize both the volume as well as the file system that is used on the volume. Of all the different file systems, ReiserFS and Ext3 support resizing with the fewest problems. The following procedure details how the volume is first brought offline and then the file system that sits on the volume is resized. It is presumed that the volume you want to shrink is called data and it is using an Ext3 file system. It is mounted on the directory /data.

After the network server is mounted, it is treated exactly like a directory on your hard disk. You can copy files to and from it, just as you would normally, using the same tools as you use for dealing with any other files. In fact, less-knowledgeable users won t even be aware that they re accessing something that isn t located on their PC s hard disk (or, technically speaking, within their Ubuntu partition and file system). By treating everything as a file, Linux makes system administration easier. To probe and test your hardware, for example, you can use the same tools you use to manipulate files.

So far you ve learned how to work with Nautilus and what the file system is. This is what is known as the logical side of data but there is a physical side as well, that is composed by the disks and removable media attached to your computer on which the file system rests. Without disks, there could be no file system, no directories, and no files. But it is not enough to attach the disk or plug in the removable media; you need also to make it available to the OS through an operation called mounting.

ext2online makes it possible to resize a live file system. However, because resizing file systems is very

Described in technical terms, mounting is the practice of making a file system available under Linux Whereas Windows uses drive letters to make other file systems available in Windows Explorer, Linux integrates the new file system within the root file system, usually by making the contents appear whenever a particular directory is accessed The mounted file system could be a partition on your hard disk, a CD-ROM, a network server, or many other things Mounting drives might seem a strange concept, but it makes everything much simpler than it might be otherwise For example, after a drive is mounted, you don t need to use any special commands or software to access its contents You can use the same programs and tools that you use to access all of your other files.

Listing 1-2. Inserting a Complete Row into the Member Table INSERT INTO Member VALUES (118, 'McKenzie', 'Melissa', '963270', 30, '05/10/1999', 'F')

Mounting creates a level playing field on which everything is equal and therefore can be accessed quickly and efficiently Most of the time, external storage devices are mounted automatically by the GNOME desktop software used under Ubuntu; a GNOME background service runs constantly and watches for the user attaching any storage devices to the PC If this occurs, the external storage device is automounted by the GNOME desktop, usually in a folder named after the device s label within the /media directory (in other words, a USB memory stick with the label KINGSTON will be mounted at /media/KINGSTON) An entry appears on the Places menu, and an icon for the device appears on the desktop, pointing to the mount point (the directory used to mount the device) In the case of mounting network storage, such as those accessed by clicking Places Network, a system called gvfs-fuse mounts the devices.

labor intensive, I wouldn t recommend doing it this way. There s always a risk that it won t work out simply because all of the work that has to be done. So, to stay on the safe side, umount your volume before resizing it.