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Historically, the JFS1 file system is very closely tied to the memory manager of AIX, [1] which is a typical design for a file system supporting only one operating system. JFS was one of the first file systems to support Journaling. In 1995, work began to enhance the file system to be more scalable and to support machines that had more than one ...
Journalling Flash File System version 2 or JFFS2 is a log-structured file system for use with flash memory devices. [1] It is the successor to JFFS . JFFS2 has been included into the Linux kernel since September 23, 2001, when it was merged into the Linux kernel mainline as part of the kernel version 2.4.10 release.
In each node, a header containing metadata is written first, followed by file data, if any. Nodes are chained together with offset pointers in the header. Nodes start out as valid and then become obsolete when a newer version of them is created. The free space remaining in the file system is the gap between the log's tail and its head.
Full copy-on-write file systems (such as ZFS and Btrfs) avoid in-place changes to file data by writing out the data in newly allocated blocks, followed by updated metadata that would point to the new data and disown the old, followed by metadata pointing to that, and so on up to the superblock, or the root of the file system hierarchy. This has ...
An alternative to a Record-oriented file is a stream file, in which the file system treats a file as an unstructured sequence of bytes. The applications may, but need not, impose a record structure. This approach significantly reduces the size and complexity of the library and reduces the number of utilities required to maintain files.
Information about the data in a file is called metadata. Some of the metadata is maintained by the file system, for example last-modification date (and various other dates depending on the file system), location of the beginning of the file, the size of the file and if the file system backup utility has saved the current version of the files.
High Throughput File System (HTFS) is a journaling file system that was used by SCO OpenServer. [1] The filesystem format is like that of an older SCO filesystem, the Extended Acer Filesystem (EAFS), but designed to be somewhat more future-proof.
If both such systems (file table, and file data) were capable of being addressed as a single entity (i.e. using virtual nodes in a cluster), then growth into such a system could be easily controlled simply by deciding which uses the grid member would be responsible (file table and file lookups, and/or file data).