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A journal, with respect to filesystems, is an area of the disk that is used to store information about pending changes to that filesystem. Filesystems contain two general types of information: the actual files and directories where your data is stored, and filesystem metadata, which is internal information about the filesystem itself (where the data for each file is physically stored, which directories contain which files, and so on). When you write to a file in a journaling filesystem, the changes that you want to make are written to the journal rather than directly to the file. The filesystem then asynchronously applies those changes to the specified file and updates the filesystem metadata only when the modified file data has been successfully written to the file in question. Journaling helps guarantee that a filesystem is always in a consistent state. When you reboot a Linux system, Linux checks the consistency of each filesystem (using a program called fsck, for file system consistency check) before mounting it. If a filesystem requires repair because its consistency cannot be verified, the fsck process can take a long time, especially on larger disks. Enterprise systems tend to require journaling filesystems to minimize the time it takes to restart the system because downtime is generally frowned upon.

There are certain situations where the use of a journaling filesystem can be a bad idea most notably with databases that store their data in a standard Linux filesystem but that keep their own log of changes to those data files and are able to recover data using their own internal methods. Oracle is a good example of a database that provides its own methods to guarantee the consistency of its data files.

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/usr/sbin/ndd -set /dev/tcp tcp_keepalive_interval 900000 /usr/sbin/ndd -set /dev/tcp tcp_time_wait_interval 30000 Prior to Solaris 27 (SunOS 57), the latter line would have read: /usr/sbin/ndd -set /dev/tcp tcp_close_wait_interval 30000 which illusrates the futility of documenting these fickle parameters in a static medium like a book Note that setting these parameters to ultra-short values could cause file transmissions to be terminated incorrectly This might lead to a corruption of data On a web server, this is a nuisance for the client, but it is not mission-critical data For security, longer close times are desirable to ensure correct closure of sockets After setting these values, the network interface needs to be restarted by taking it down and up with if conf ig Alternatively, the values can be configured in a start-up script which is executed before the interface is brought up at boot time.

Internet 101 TCP/IP The ISO OSI model The DoD model IP addresses Routing And Breathe 136 136 137 140 141 146 147.

While this chapter presented an overview of pure ES, Part IV presents the particle swarm optimization algorithm from swarm intelligence, which shares some of the aspects of ES.

Most Unix-like operating systems do not permit runtime configuration; new kernels have to be compiled and the values hard-coded into the kernel This requires not just a reboot, but a recompilation of the kernel in order to make a change This is not an optimal way to experiment with parameters Modularity in kernel design can save us memory, since it means that static code does not have to take up valuable memory space However, the downside of this is that modules take time to load from disk, on demand Thus, a modular kernel can be slower than a statically compiled kernel For frequently used hardware, static compilation is a must, since it eliminates the load-time for the module, at the expense of extra memory consumption.

Why Log The Files in /var/log Logging with syslog Logging with syslog-ng The log source The filter The log destination The log definition tying it all together Future Directions for Linux Logging Managing Your Logs with logrotate Analyzing Your Logs with logcheck Using Webalizer Reading Log Files 149 149 151 153 154 155 156 156 157 157 159 161 162.

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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