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The GNU/Linux system kernel is a modular kernel, which can load drivers for special hardware at run time, in order to remain small in the memory When we build a kernel, we have the option to compile in modules statically (see section 47) Tips for Linux kernel configuration can readily be found by searching the Internet, so we shall not reproduce these tips here, where they would quickly become stale (see, for instance ref [71]) NT performance tuning can be undertaken by perusing the multitudinous screens in the graphical performance monitor and editing the values For once, this useful tool is a standard part of the NT system 774 Data Efficiency.

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.

Efficiency of storage and transmission depends upon the configuration parameters used to confure disks and networks, and also on the amount of traffic the devices see. We have already mentioned the problem of contention. Some file system formatting programs on Unix-like systems allow us to reserve a certain percentage of disk space for privileged users. For instance, the default for BSD is to reserve 10% of the size of a partition for use by privileged processes only. The idea here is to prevent the operating system from choking, due to the activities of users. This practice goes back to the early times when disks were small and expensive and partition numbers were limited. Today, these limits are somewhat in appropriate. Of a one bigabyte disk, 10% is a huge amount of space, which many users could live happily with for many weeks. If we have partitioned a host so as to separate users from operating system, then there is no need to reserve space on user disks. Better to let users utilize the existing space until a real problem

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.

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