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EXT2 has been the de facto Linux filesystem for many years and is still used for initial ramdisks and most non-journaling filesystems. Because of its age, EXT2 is considered extremely stable and is quite lightweight in terms of overhead. The downside to this is that it does not use any journaling system to maintain integrity of data and metadata.
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EXT3 is a journaling version of the EXT2 filesystem discussed in the previous section. It adds a journal to the EXT2 filesystem, which can be done to an existing EXT2 filesystem, enabling easy upgrades. This is not possible with other journaling filesystems because they are internally very different from other existing filesystems. EXT3 provides three journaling modes, each of which has different advantages and disadvantages: journal Logs all filesystem data and metadata changes. The slowest of the three EXT3 journaling modes, this journaling mode minimizes the chance of losing the changes you have made to any file in an EXT3 filesystem. ordered Logs only changes to filesystem metadata, but flushes file data updates to disk before making changes to associated filesystem metadata. This is the default EXT3 journaling mode. writeback Logs only changes to filesystem metadata but relies on the standard filesystem write process to write file data changes to disk. This is the fastest EXT3 journaling mode.
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Beyond its flexibility and the ease with which EXT2 filesystems can be converted to EXT3 filesystems, another advantage of the EXT3 filesystem is that it is also backward compatible, meaning that you can mount an EXT3 filesystem as an EXT2 system because the layout on disk is exactly the same. This enables you to take advantage of all the existing filesystem repair, tuning, and optimization software that you have always used with EXT2 filesystems should you ever need to repair an EXT3 filesystem.
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The ReiserFS filesystem was mentioned earlier; this section provides more in-depth information about its advantages and capabilities. ReiserFS is one of the most stable Linux journaling filesystems available. Although occasional problems have surfaced in the past, the ReiserFS filesystem is widely used, and problems are therefore quickly corrected. ReiserFS does not allocate and access files in the traditional block-by-block manner as do other filesystems such as EXT2, but instead uses a very fast, balanced b-tree (binary tree) algorithm to find both free space and existing files on the disk. This b-tree adds a simple but elegant mechanism for dealing with small files (files that are smaller than the filesystem block size, generally 4 kilobytes) in ReiserFS. If a file is smaller than a filesystem block, it is actually stored in the binary tree itself instead of being pointed to. Retrieving the data for these files therefore takes no more time than is required to locate them in the b-tree, which makes ReiserFS an excellent choice for filesystems in which large numbers of small files are constantly being created and deleted, such as mail directories or mail servers. ReiserFS also provides other optimization that can lead to dramatic space savings compared to traditional filesystems. When a file is stored on a filesystem, filesystem blocks are allocated to actually store the data that the files contain. If you had a block size of 4K, but wished to store a file of 6K on the disk, you would be wasting 2K of disk space because a block belongs to one file only and in this case you would have to occupy two, wasting 2K and therefore not optimally using the space. ReiserFS can also store these fragments in its b-tree by packing them together, which provides another way of minimizing disk space consumption in a ReiserFS filesystem. Later in the chapter, we look at some published benchmarks comparing filesystems in different situations.
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JFS is a port of IBM s Journaling Filesystem to Linux. JFS was originally developed for IBM s OS/2 operating system and later adapted for use as the enterprise filesystem used on its pSeries/AIX-based systems. IBM released the source code for JFS to the open source community in 2000 and has actively participated in the continuing development and support of this filesystem for Linux since that time. JFS is similar to ReiserFS in that it uses binary trees to store information about files. JFS is heavily based on transactions, in much the same way that databases are, using these as the basis for the records that it maintains in its journal. JFS provides a very fast method of data allocation based on extents. An extent is a contiguous series of data blocks that can be allocated, read, written, and managed at one time. JFS also makes clever use of filesystem data structures such as the inode (information node) data structure that is associated with each single file or directory in the filesystem. At least one inode exists for every file in the filesystem, but JFS creates them only when files and directories are created. In traditional filesystems, the number of inodes (and thus the number of files) on a filesystem was dictated at filesystem creation time. This could lead to a situation in which even though there was enough space on the device, no more files could be created because there was nowhere to store information about the file. Creating inodes as files and
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