Beyond Linux® From Scratch - Version 2015-03-06-multilib

Chapter 5. File Systems and Disk Management

mdadm-3.3.2

Introduction to mdadm

The mdadm package contains administration tools for software RAID.

This package is known to build and work properly using an LFS-7.7 platform.

Package Information

User Notes: http://wiki.linuxfromscratch.org/blfs/wiki/mdadm

Kernel Configuration

Enable the following options in the kernel configuration and recompile the kernel, if necessary. Only the RAID types desired are required. 

Device Drivers --->
  [*] Multiple devices driver support (RAID and LVM) ---> [CONFIG_MD]
    <*> RAID support                                      [CONFIG_BLK_DEV_MD]
    [*]   Autodetect RAID arrays during kernel boot       [CONFIG_MD_AUTODETECT]
    <*/M>  Linear (append) mode                           [CONFIG_MD_LINEAR]
    <*/M>  RAID-0 (striping) mode                         [CONFIG_MD_RAID0]
    <*/M>  RAID-1 (mirroring) mode                        [CONFIG_MD_RAID1]
    <*/M>  RAID-10 (mirrored striping) mode               [CONFIG_MD_RAID10]
    <*/M>  RAID-4/RAID-5/RAID-6 mode                      [CONFIG_MD_RAID456]

Installation of mdadm

First, fix a problem inroduced by gcc-4.9.0: 

sed -i 's/Wall -Werror/Wall/' Makefile

Install mdadm by running the following commands: 

make

If you wish to run the tests, ensure that your kernel supports RAID and that a version of mdadm is not already running, and issue: make test and then, as the root user: ./test

Now, as the root user: 

make install

Command Explanations

make everything: This target creates extra programs, particularly a statically-linked version of mdadm and also versions of mdassemble. These all need to be manually installed.

Contents

Installed Programs: mdadm, mdmon and optionally mdassemble
Installed Libraries: None
Installed Directory: None

Short Descriptions

mdadm

manages MD devices aka Linux Software RAID.

mdmon

monitors MD external metadata arrays.

mdassemble

is a tiny program that can be used to assemble MD devices inside an initial ramdisk (initrd) or initramfs.

Last updated on 2015-02-20 15:02:49 -0500