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User data and metadata are written in the data section The log section contains the journaling information for XFS, and the real-time section is used to store real-time files These files are updated immediately Each XFS file system is identified by a UUID, which is stored in the header of each allocation group and helps you distinguish one XFS file system from the other For this reason, never use a block-copying program like dd to copy data from one XFS volume to another XFS volume; use xfsdump and xfsrestore instead A unique feature of XFS is its delayed allocation, which makes sure that a pending write is not written to hard disk immediately, but to RAM first The decision to write is delayed to the last minute The advantage is that, when the file doesn t need to be written after all, it isn t written.

simply won t let you, and will report an Invalid Parameters error. In our experience, it will let you copy a file with illegal symbols in its name to a Windows partition, however. This results in the file being inaccessible from within Windows, so be careful!

What should we do if we want to find all the members with a handicap less than Barbara Olson s Listing 4-13 will do that for us but only if Barbara s handicap of 16 doesn t change. We can replace the single value 16 with the result of an inner query that returns Barbara s handicap as in Listing 4-14. Now the query will work for whatever Barbara s current handicap is.

Linux sees virtually everything as a series of files. This might sound absurd and certainly requires further explanation. Let s start with the example of plugging in a piece of hardware. Whenever you attach something to a USB port, the Linux kernel finds it, sees whether it can make the hardware work, and if everything checks out okay, it usually makes the hardware available as a file under the /dev directory on your hard disk (dev is short for devices). Figure 10-9 shows an example of a /dev directory. The file created in the /dev directory is not a real file, of course. It s a file system shortcut plumbed through to the input and output components of the hardware you ve just attached.

In this way, XFS reduces file system fragmentation and simultaneously increases write performance Another great feature of XFS is preallocation, which makes sure that space is reserved before the data blocks are actually written This feature increases the chances that a complete file can be written to a series of consecutive blocks and thus avoids fragmentation..

Note As a user, you re not expected to delve into the /dev directory and deal with this hardware directly. Most

of the time, you ll use various software packages that will access the hardware for you or use special BASH commands or GUI programs to make the hardware available in a more accessible way for day-to-day use.

When creating an XFS file system with the mkfsxfs command, some specific options are available: Block size in bytes: This option allows you to set the block size you want to use By default, the block size is set to 4,096 bytes, but you can also set it to 512, 1,024, or 2,048 Inode size: Use this option to specify the size of inodes you want to create on the file system This option is needed only if you have to do very specific things on your file system, like working with files that have lots of extended attributes Percentage of inode space: If so required, you can limit the percentage of the file system that can be used for storage of inodes By default, there is no maximum setting.

Listing 4-14. SQL Statement to Retrieve Members with Handicaps Less Than Barbara Olson s SELECT * FROM Member m WHERE Handicap < (SELECT Handicap FROM Member WHERE LastName = 'Olson' AND FirstName = 'Barbara')

2. 3.

Press Control-X to boot the computer. This boot will take longer than usual, because the boot profile is being rebuilt. When the computer has booted up, and all disk activity has stopped (which might take a minute or two after the Desktop has appeared), reboot your computer. You should find that bootup is faster.