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CHAPTER 4 PERFORMING FILE SYSTEM MANAGEMENT TASKS
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resize_reiserfs: As its name suggests, the resize_reiserfs utility is used to resize a Reiser file system. You should be aware that resizing a file system involves two steps: you first need to resize the device where the file system is created, and only then can you resize the file system itself. There ll be more on resizing devices later in this chapter. And using resize_reiserfs is rather simple: for example, use resize_reiserfs -s /dev/sdb2 to resize the Reiser file system on sdb2 so that it fills this device completely. Alternatively, you can specify the size to resize it with in kilobytes, (-K), megabytes (-M), or gigabytes (-G). If you want to shrink a file system by 500 MB, use resize_reiserfs -M 500 /dev/sdb2. debugreiserfs: The debugreiserfs command allows you to dive into the ReiserFS administrative information to see if all is set according to your expectations. If you run it without options, you ll just get an overview of the superblock. Several options are available to tune its workings. For example, debugreiserfs -j /dev/sdb2 prints the contents of the journal. It s also possible to dive into specific blocks when using the -l option, which takes as its argument the block you want to see the contents of. Using this option can be useful if you want to do a block-by-block reconstruction of a file that was destroyed by accident. Summarized, ReiserFS is a robust file system that offers many advantages. Because of its current lack of support and the unpredictable future of the company, it s not a very good idea to depend too heavily on it.
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For very large environments, the XFS file system is probably the best choice. It was, after all, developed by SGI for use on supercomputers. Like ReiserFS, it is a full 64-bit file system, and its major benefit is that it works great on very large files. One of the key factors of XFS is that it uses allocation groups, which are like file systems in a file system. The advantage of using these allocation groups is that the kernel can address more than one group at the same time and each group has its own administration of inodes and free disk space. Of course, XFS is capable of creating new inodes dynamically when this is needed. All of this makes the XFS file system very flexible and robust. The XFS file system consists of three different sections: data, log, and real-time. 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. 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.
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