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Basic example of an LVM head Inner workings of the version 1 of LVM. In this diagram, PE stands for a Physical Extent. Typically, the first megabyte of each physical volume contains a mostly ASCII-encoded structure referred to as an "LVM header" or "LVM head". Originally, the LVM head used to be written in the first and last megabyte of each PV ...
The device mapper is a framework provided by the Linux kernel for mapping physical block devices onto higher-level virtual block devices.It forms the foundation of the logical volume manager (LVM), software RAIDs and dm-crypt disk encryption, and offers additional features such as file system snapshots.
NetBSD from version 6.0 supports its own re-implementation of Linux LVM. Re-implementation is based on a BSD licensed device-mapper driver and uses a port of Linux lvm tools as the userspace part of LVM. There is no need to support RAID5 in LVM because of NetBSD superior RAIDFrame subsystem. NetBSD: ZFS: Yes Yes Yes Yes Yes Yes Yes
In 2005, Apple Inc. hired Lattner and formed a team to work on the LLVM system for various uses within Apple's development systems. [26] LLVM has been an integral part of Apple's Xcode development tools for macOS and iOS since Xcode 4 in 2011. [27] In 2006, Lattner started working on a new project named Clang. The combination of the Clang ...
OpenWrt (from open wireless router) is an open-source project for embedded operating systems based on Linux, primarily used on embedded devices to route network traffic. The main components are Linux, util-linux, musl, [5] and BusyBox. All components have been optimized to be small enough to fit into the limited storage and memory available in ...
Operating within the Linux kernel's block layer, DRBD is essentially workload agnostic. A DRBD can be used as the basis of: A conventional file system (this is the canonical example), a shared disk file system such as GFS2 or OCFS2, [12] [13] another logical block device (as used in LVM, for example),
Stratis provides ZFS/Btrfs-style features by integrating layers of existing technology: Linux's device mapper subsystem, and the XFS filesystem. The stratisd daemon manages collections of block devices, and provides a D-Bus API. The stratis-cli DNF package provides a command-line tool stratis, which itself uses the D-Bus API to communicate with ...
JBOD (just a bunch of disks or just a bunch of drives) is an architecture using multiple hard drives exposed as individual devices.Hard drives may be treated independently or may be combined into one or more logical volumes using a volume manager like LVM or mdadm, or a device-spanning filesystem like btrfs; such volumes are usually called "spanned" or "linear | SPAN | BIG".