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

  • FreePBX 17 How To Add a Trunk
  • Docker Container Onboot Policy - How to make sure a container is always running
  • FreePBX 17 How To Add Phones / Extensions and Register
  • Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. solution
  • Cisco How To Use a Third Party SIP Phone (eg. Avaya, 3CX)
  • Cisco Unified Communication Manager (CUCM) - How To Add Phones
  • pptp / pptpd not working in DD-WRT iptables / router
  • systemd-journald high memory usage solution
  • How to Install FreePBX 17 in Linux Debian Ubuntu Mint Guide
  • How To Install Cisco's CUCM (Cisco Unified Communication Manager) 12 Guide
  • Linux Ubuntu Redhat How To Extract Images from PDF
  • Linux and Windows Dual Boot Issue NIC Won't work After Booting Windows
  • Cisco CME How To Enable ACD hunt groups
  • How to install gns3 on Linux Ubuntu Mint
  • How to convert audio for Asterisk .wav format
  • Using Cisco CME Router with Asterisk as a dial-peer
  • Cisco CME How To Configure SIP Trunk VOIP
  • Virtualbox host Only Network Error Failed to save host network interface parameter - Cannot change gateway IP of host only network
  • Cisco CME and C7200 Router Testing and Learning Environment on Ubuntu 20+ Setup Tutorial Guide
  • Abusive IP ranges blacklist