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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.
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 ...
[2] [3] It is built upon enterprise-tested components LVM and XFS with over a decade of enterprise deployments and the lessons learned from System Storage Manager in Red Hat Enterprise Linux 7. [ 4 ] Stratis provides ZFS/Btrfs-style features by integrating layers of existing technology: Linux's device mapper subsystem, and the XFS filesystem.
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
Before the 10.5 release, Apple released the "ZFS Beta Seed v1.1", which allowed read-write access and the creation of z-pools; [24] however, the installer for the "ZFS Beta Seed v1.1" has been reported to only work on version 10.5.0, and has not been updated for version 10.5.1 and above. [25]
Ubuntu releases are also given code names, using an adjective and an animal with the same first letter – an alliteration, e.g., "Dapper Drake".With the exception of the first two releases, code names are in alphabetical order, and except for the first three releases, the first letters are sequential, allowing a quick determination of which release is newer.
Sometime after the release of version 2.5.5 on February 26, 2006, IBM discontinued development of the project. There have been no further releases. In 2008 Novell announced that the company would be moving from EVMS to LVM in future editions of their SUSE products, while continuing to fully support customers using EVMS.
Lustre Cluster filesystem will use FUSE to allow it to run in userspace, so that a FreeBSD port is possible. [11] However, the ZFS-Linux port of Lustre will be running ZFS's DMU (Data Management Unit) in userspace. [12] MinFS: MinFS is a fuse driver for Amazon S3 compatible object storage server.