mdadm Linux Software RAID auto-detect and assemble RAID Array

mdadm --assemble --scan


mdadm: /dev/md/diaghost05102010:2 has been started with 2 drives.
mdadm: /dev/md/diaghost05102010:1 has been started with 2 drives.
mdadm: /dev/md/diaghost05102010:0 has been started with 2 drives.
-bash-3.1# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [multipath]
md125 : active raid1 sda1[0] sdb1[1]
      14658185 blocks super 1.2 [2/2] [UU]
     
md126 : active raid1 sda2[0] sdb2[1]
      58604024 blocks super 1.2 [2/2] [UU]
     
md127 : active raid1 sda3[0] sdb3[1]
      1880246440 blocks super 1.2 [2/2] [UU]
      [>....................]  resync =  0.0% (1228928/1880246440) finish=407.7min speed=76808K/sec
     
unused devices: <none>

The only strange thing is that the drives were all renamed to something high, md125,126 and 127 when I originally created them as 0,1,2

What if you don't want to assemble the array?

You can just scan like this

mdadm -D -s

ARRAY /dev/md/diaghost05102010:2 metadata=1.2 name=diaghost05102010:2 UUID=d851091d:3d109a17:921ab0e1:3a465899
ARRAY /dev/md/diaghost05102010:1 metadata=1.2 name=diaghost05102010:1 UUID=f841529d:a434b994:6f27c55b:64f4ef7d
ARRAY /dev/md/diaghost05102010:0 metadata=1.2 name=diaghost05102010:0 UUID=cba74a1f:e1c83abe:1ea30dc3:cee425bd

To see the details of a specific array just do this:

mdadm -D /dev/md/diaghost05102010:2
/dev/md/diaghost05102010:2:
        Version : 1.2
  Creation Time : Mon May 10 22:05:48 2010
     Raid Level : raid1
     Array Size : 1880246440 (1793.14 GiB 1925.37 GB)
  Used Dev Size : 1880246440 (1793.14 GiB 1925.37 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Wed May 12 23:37:54 2010
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : diaghost05102010:2
           UUID : d851091d:3d109a17:921ab0e1:3a465899
         Events : 6

    Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync   /dev/sda3
       1       8       19        1      active sync   /dev/sdb3


Tags:

mdadm, linux, software, raid, auto, detect, assemble, arraymdadm, scan, dev, md, diaghost, bash, proc, mdstat, personalities, linear, multipath, active, sda, sdb, uu, resync, min, unused, devices, renamed, originally, array, metadata, uuid, ab, ef, cba, ea, dc, cee, bd, creation, gib, gb, persistence, superblock, persistent, update, wed, raiddevice, sync,

Latest Articles

  • ssh Too many authentication failures not prompting for password
  • LightDM Mint Ubuntu Debian won't start errors Nvidia Graphics
  • WARNING: Unable to determine the path to install the libglvnd EGL vendor library config files. Check that you have pkg-config and the libglvnd development libraries installed, or specify a path with --glvnd-egl-config-path. Linux Ubuntu Mint Debian E
  • How To Upgrade Linux Mint 18.2 to 18.3 to 19.x and 20.x
  • MP3s Won't Play / ID3 Version 2.4 Issues in Cars and Other MP3 Players/CDs/DVDs Solution
  • LXC Containers LXD How to Install and Configure Tutorial Ubuntu Debian Mint
  • GlusterFS HowTo Tutorial For Distributed Storage in Docker, Kubernetes, LXC, KVM, Proxmox
  • Ubuntu Mint audio output not working pulseaudio "pulseaudio[13710]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink."
  • How To Shrink Dynamically Allocated VM QEMU KVM VMware Disk Image File
  • How To Enable Linux Swapfile Instead of Partition Ubuntu Mint Debian Centos
  • 404 Not Found [IP: 151.101.194.132 80] apt update Debian 11 Bullseye Solution The repository 'http://security.debian.org bullseye/updates Release' does not have a Release file.
  • WARNING: Can't download daily.cvd from db.local.clamav.net freshclam clamav error solution
  • (firefox:9562): LIBDBUSMENU-GLIB-WARNING **: Unable to get session bus: Failed to execute child process "dbus-launch" (No such file or directory) Solution
  • Debian Mint Ubuntu Which Package Provides missing top, ps and w Solution
  • Vbox Virtualbox DNS NAT Network Mode NOT working
  • Docker Tutorial HowTo Install Docker, Use and Create Docker Container Images Clustering Swarm Mode Monitoring Service Hosting Provider
  • Zoom Password Error 'That passcode was incorrect' - Solution Wrong Passcode Wrong Meeting Name
  • How To Startup and Open Remote/Local Folder/Directory in Ubuntu Linux Mint automatically upon login
  • How To Reset Windows Server Password 2019, 2022, 7, 8, 10, 11 Recovery and Removal Guide Using Linux Ubuntu Mint Debian
  • How To Create OpenVPN Server for Secure Remote Corporate Access in Linux Debian/Mint/Ubuntu with client public key authentication