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On Linux, network block device (NBD) is a network protocol that can be used to forward a block device (typically a hard disk or partition) from one machine to a second machine. As an example, a local machine can access a hard disk drive that is attached to another computer. The protocol was originally developed for Linux 2.1.55 and released in ...
Most systems create both block and character devices to represent hardware like hard disks. FreeBSD and Linux notably do not; the former has removed support for block devices, [8] while the latter creates only block devices. To get the effect of a character device from a block device on Linux, one must open the device with the Linux-specific O ...
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),
Back-stores do not need to be physical SCSI devices. The most important back-store media types are: Block: The block driver allows using raw Linux block devices as back-stores for export via LIO. This includes physical devices, such as HDDs, SSDs, CDs/DVDs, RAM disks, etc., and logical devices, such as software or hardware RAID volumes or LVM ...
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 .
Simple multipath example. DM-MPIO in Linux consists of kernel components and user-space components. Kernel – device-mapper – block subsystem that provides layering mechanism for block devices. dm-multipath – kernel module implementing the multipath device-mapper target.
Virtual device drivers represent a particular variant of device drivers. They are used to emulate a hardware device, particularly in virtualization environments, for example when a DOS program is run on a Microsoft Windows computer or when a guest operating system is run on, for example, a Xen host.
UnixWare includes a dynamically loadable device driver marry(7) and the utility marry(1M). [4] The marry driver allows a regular file to be treated as a device. The regular file can be accessed through either a block device, /dev/marry/regfile, or as a character device, /dev/marry/rregfile.