Kernel Device Mapper Support

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Device-mapper snapshot support — The Linux Kernel ...

    https://www.kernel.org/doc/html/latest/admin-guide/device-mapper/snapshot.html
    Device-mapper snapshot support ¶ Device-mapper allows you, without massive data copying: To create snapshots of any block device i.e. mountable, saved states of the block device which are also writable without interfering with the original content; To create device “forks”, i.e. multiple different versions of the same data stream.

Device Mapper — The Linux Kernel documentation

    https://www.kernel.org/doc/html/v5.3/admin-guide/device-mapper/index.html
    Kernel Support for miscellaneous (your favourite) Binary Formats v1.1; Mono(tm) Binary Kernel Support for Linux; Java(tm) Binary Kernel Support for Linux v1.03; Reliability, Availability and Serviceability; A block layer cache (bcache) The Linux RapidIO Subsystem; ... Device Mapper ¶ Guidance for writing policies ...

Device Mapper — The Linux Kernel documentation

    https://www.kernel.org/doc/html/latest/admin-guide/device-mapper/index.html
    Device-mapper snapshot support; DM statistics; dm-stripe; dm-switch; Thin provisioning; Device-mapper “unstriped” target; dm-verity; Writecache target; dm-zero; The EFI Boot Stub; ext4 General Information; gpio; Notes on the change from 16-bit UIDs to 32-bit UIDs; Linux support for random number generator in i8xx chipsets; Using the initial ...

Linux Kernel Support - ZonedStorage.io

    https://zonedstorage.io/introduction/linux-support/
    Device Mapper and dm-zoned Support With kernel version 4.13.0, support for zoned block devices was added to the device mapper infrastructure. This support allows using the dm-linear and dm-flakey device mapper targets on top of zoned block devices. Additionally, the new dm-zoned device mapper target was also added.

LVM Support for the Linux 2.4 Kernel - Device Mapper ...

    https://www.netadmintools.com/art551.html
    We decided to build a very small box to serve up an iSCSI target using LVM for the storage device. We used the root filesystem from here, which means that we are starting from a very basic system. We are using version 2.4.32 of the Linux kernel. Do consider Openfiler if you have more sophisticated […]

Device-mapper “unstriped” target — The Linux Kernel ...

    https://www.kernel.org/doc/html/latest/admin-guide/device-mapper/unstriped.html
    The device-mapper “unstriped” target provides a transparent mechanism to unstripe a device-mapper “striped” target to access the underlying disks without having to touch the true backing block-device. It can also be used to unstripe a hardware RAID-0 to access backing disks.

Linux Kernel Configuration - Filesystems

    https://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09s05.html
    To do this, the kernel uses something called Device Mapper (DM). To enable Device Mapper support in the kernel: Device Drivers Multi-device support (RAID and LVM) [*] Multiple devices driver support (RAID and LVM) [*] Device mapper support There are a number of helper modules that work with Device Mapper to provide additional functionality.

device-mapper uevent — The Linux Kernel documentation

    https://www.kernel.org/doc/html/latest/admin-guide/device-mapper/dm-uevent.html
    The device-mapper uevent code adds the capability to device-mapper to create and send kobject uevents (uevents). Previously device-mapper events were only available through the ioctl interface. The advantage of the uevents interface is the event contains environment attributes providing increased context for the event avoiding the need to query the state of the device-mapper device after the event …

Device mapper - Wikipedia

    https://en.wikipedia.org/wiki/Device_mapper
    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, software RAIDs and dm-crypt disk encryption, and offers additional features such as file system snapshots. Device mapper works by passing data from a virtual block device, which is provided by the device mapper itself, to another block device…

kernel: device-mapper: table: device X:X too small for ...

    https://access.redhat.com/solutions/392963
    device-mapper errors are present in the logs; kernel: device-mapper: table: device 8:16 too small for target kernel: device-mapper: table: 253:7: linear: dm-linear: Device lookup failed Attempting to manually activate the logical volume results in failure # vgchange -ay volgrp Environment. Red Hat Enterprise Linux; Logical Volume Manager 2



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