c# create barcode from string PERFORMING FILE SYSTEM MANAGEMENT TASKS in Font

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CHAPTER 4 PERFORMING FILE SYSTEM MANAGEMENT TASKS
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Hans Reiser developed the ReiserFS file system in the late 1990s as a completely new file system, no longer based on file system tables but on a balanced tree database structure. This database makes locating files very fast as compared to older file systems like Ext2 and Ext3. And ReiserFS offers other advantages as well, one of which is that it has a better disk utilization. This is because it is capable of using disk suballocation, in which it is not necessary to use a complete block when writing a very small file. More than one small file can be written to the same disk block, using one leaf node in the B-tree database. Therefore, ReiserFS is more efficient in writing many small files. ReiserFS is also more flexible because it allows for dynamic inode allocation: if a file system runs out of available inodes, new inodes can be created dynamically. Because small files are stored with their metadata in the same database record, ReiserFS is fast in handling small files. Of course, ReiserFS has some minor disadvantages as well: it s relatively slow in heavy write environments, and it also gets slow if it is more than 90 percent full. Unfortunately, ReiserFS has one hugely important disadvantage: the lack of community support. It was because of this that Novell traditionally the most important Linux distribution that uses ReiserFS decided to drop ReiserFS as the default file system and turned to Ext3 instead. In the long term, this doesn t bode well for ReiserFS, nor does the fact that Hans Reiser is currently in jail, facing some serious charges. Therefore, even if ReiserFS has some nice technical features, you should not depend on it too much. Like Ext2 and Ext3, ReiserFS also has some management utilities. Here s a short description of these tools, including some of the most interesting options: reiserfsck: The reiserfsck tool is used to check the consistency of a Reiser file system, and it has some powerful repair options. One of them is --rebuild-sb, which stands for rebuild superblock. Use this option when you get the error read super_block: can t find a reiserfs file system. Another option is the --rebuild-tree option, which hopefully you won t see too often. This option is required when reiserfsck wasn t able to repair the file system automatically because it found some serious tree inconsistencies. Basically, the --rebuild-tree option will rebuild the complete B-tree database. Before using this option, always make a backup of the complete partition where you are running it and never interrupt the command; doing so will definitely leave you with an inaccessible file system. reiserfstune: The reiserfstune command can be used for several purposes. Basically, you use it to tune options with regards to the Reiser journal, but you can also use it to set a UUID and a label that allow you to mount the file system without being dependent on the name of the device where it resides. This command has some interesting options as well. One of them is the -j option that allows you to specify the journal device you want to use. This option makes it possible to separate the Reiser journal from the actual file system; it s a very useful option if you want to avoid a situation where a single-point failure can render your system inaccessible. Another interesting option that can be used with reiserfstune is the option -l that allows you to specify a label for the file system. This label can be used when mounting the file system and thus increases your flexibility when working on the file system.
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