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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 ...
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_DIRECT flag.
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 ...
NDISwrapper is a free software driver wrapper that enables the use of Windows XP network device drivers (for devices such as PCI cards, USB modems, and routers) on Linux operating systems. NDISwrapper works by implementing the Windows kernel and NDIS APIs and dynamically linking Windows network drivers to this
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 .
Kernel – device-mapper – block subsystem that provides layering mechanism for block devices. dm-multipath – kernel module implementing the multipath device-mapper target. User-space – multipath-tools – provides the tools to manage multipathed devices by instructing the device-mapper multipath module what to do. The tools consist of:
Being network devices supported entirely in software, they differ from ordinary network devices which are backed by physical network adapters. The Universal TUN/TAP Driver originated in 2000 as a merger of the corresponding drivers in Solaris, Linux and BSD. [1] The driver continues to be maintained as part of the Linux [2] and FreeBSD [3] [4 ...