Introduction to mdadm

The mdadm package contains administration tools for software RAID.



Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

Package Information

mdadm Dependencies



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) --->                   [MD]
    <*/M>   RAID support                                            [BLK_DEV_MD]
    [*]       Autodetect RAID arrays during kernel boot          [MD_AUTODETECT]
    # Only the RAID types desired are required:
    < /*/M> RAID-0 (striping) mode                                    [MD_RAID0]
    < /*/M> RAID-1 (mirroring) mode                                   [MD_RAID1]
    < /*/M> RAID-10 (mirrored striping) mode                         [MD_RAID10]
    < /*/M> RAID-4/RAID-5/RAID-6 mode                               [MD_RAID456]

Installation of mdadm

Build mdadm by running the following command:


This package does not come with a working test suite.

Now, as the root user:

make BINDIR=/usr/sbin install

Command Explanations

make everything: This optional target creates extra programs, particularly a statically-linked version of mdadm. This needs to be manually installed.


Installed Programs: mdadm and mdmon
Installed Libraries: None
Installed Directory: None

Short Descriptions


manages MD devices aka Linux Software RAID


monitors MD external metadata arrays