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  2. zram - Wikipedia

    en.wikipedia.org/wiki/Zram

    zram, formerly called compcache, is a Linux kernel module for creating a compressed block device in RAM, i.e. a RAM disk with on-the-fly disk compression. The block device created with zram can then be used for swap or as general-purpose RAM disk. The two most common uses for zram are for the storage of temporary files (/tmp) and as a swap ...

  3. OverlayFS - Wikipedia

    en.wikipedia.org/wiki/OverlayFS

    It was merged into the Linux kernel mainline in 2014, in kernel version 3.18. [4] [5] It was improved in version 4.0, bringing improvements necessary for e.g. the overlay2 storage driver in Docker. [6] While most Live CD linux distributions used Aufs as of November 2016, Slackware used overlayfs for its live CD. [7]

  4. SquashFS - Wikipedia

    en.wikipedia.org/wiki/SquashFS

    In 2009 Squashfs was merged into Linux mainline as part of Linux 2.6.29. [ 8 ] [ 9 ] In that process, the backward-compatibility code for older formats was removed. Since then the Squashfs kernel-space code has been maintained in the Linux mainline tree, while the user-space tools remain on the project's GitHub page.

  5. File system fragmentation - Wikipedia

    en.wikipedia.org/wiki/File_system_fragmentation

    Thus, fragmentation is an important problem in file system research and design. The containment of fragmentation not only depends on the on-disk format of the file system, but also heavily on its implementation. [9] File system fragmentation has less performance impact upon solid-state drives, as there is no mechanical seek time involved. [10]

  6. Defragmentation - Wikipedia

    en.wikipedia.org/wiki/Defragmentation

    An otherwise blank disk has five files, A through E, each using 10 blocks of space (for this section, a block is an allocation unit of the filesystem; the block size is set when the disk is formatted and can be any size supported by the filesystem). On a blank disk, all of these files would be allocated one after the other (see example 1 in the ...

  7. Disk partitioning - Wikipedia

    en.wikipedia.org/wiki/Disk_partitioning

    Disk partitioning or disk slicing [1] is the creation of one or more regions on secondary storage, so that each region can be managed separately. [2] These regions are called partitions. It is typically the first step of preparing a newly installed disk after a partitioning scheme is chosen for the new disk before any file system is created ...

  8. Write amplification - Wikipedia

    en.wikipedia.org/wiki/Write_amplification

    The introduction of the TRIM command resolves this problem for operating systems that support it like Windows 7, [21] Mac OS (latest releases of Snow Leopard, Lion, and Mountain Lion, patched in some cases), [23] FreeBSD since version 8.1, [24] and Linux since version 2.6.33 of the Linux kernel mainline. [25]

  9. Memory leak - Wikipedia

    en.wikipedia.org/wiki/Memory_leak

    A memory leak may also happen when an object is stored in memory but cannot be accessed by the running code (i.e. unreachable memory). [2] A memory leak has symptoms similar to a number of other problems and generally can only be diagnosed by a programmer with access to the program's source code.