linux2/mdadm.txt at main · DigicompClassesByPapIT/linux2 · GitHub

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chrichri@ubuntu:~$ sudo apt install mdadm
...
chrichri@ubuntu:~$ sudo systemctl status mdmonitor
● mdmonitor.service - MD array monitor
   Loaded: loaded (/lib/systemd/system/mdmonitor.service; static; vendor preset: enabled)
   Active: inactive (dead)
chrichri@ubuntu:~$ sudo systemctl enable mdmonitor
The unit files have no installation config (WantedBy, RequiredBy, Also, Alias
settings in the [Install] section, and DefaultInstance for template units).
This means they are not meant to be enabled using systemctl.
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
   .wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
   a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
   D-Bus, udev, scripted systemctl call, ...).
4) In case of template units, the unit is meant to be enabled with some
   instance name specified.
chrichri@ubuntu:~$ sudo systemctl start mdmonitor
chrichri@ubuntu:~$ sudo systemctl status mdmonitor
● mdmonitor.service - MD array monitor
   Loaded: loaded (/lib/systemd/system/mdmonitor.service; static; vendor preset: enabled)
   Active: active (running) since Sun 2024-08-18 23:10:19 CEST; 4s ago
 Main PID: 513 (mdadm)
    Tasks: 1 (limit: 2333)
   CGroup: /system.slice/mdmonitor.service
           └─513 /sbin/mdadm --monitor --scan

août 18 23:10:19 ubuntu systemd[1]: Started MD array monitor.
chrichri@ubuntu:~$ lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
fd0      2:0    1    4K  0 disk
sda      8:0    0   16G  0 disk
└─sda1   8:1    0   16G  0 part /
sdb      8:16   0  500M  0 disk
sdc      8:32   0  500M  0 disk
chrichri@ubuntu:~$ mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
mdadm: must be super-user to perform this action
chrichri@ubuntu:~$ sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
mdadm: Note: this array has metadata at the start and
    may not be suitable as a boot device.  If you plan to
    store '/boot' on this device please ensure that
    your boot-loader understands md/v1.x metadata, or use
    --metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
chrichri@ubuntu:~$ sudo mdadm --detail /dev/md0
/dev/md0:
           Version : 1.2
     Creation Time : Sun Aug 18 23:12:16 2024
        Raid Level : raid1
        Array Size : 510976 (499.00 MiB 523.24 MB)
     Used Dev Size : 510976 (499.00 MiB 523.24 MB)
      Raid Devices : 2
     Total Devices : 2
       Persistence : Superblock is persistent

       Update Time : Sun Aug 18 23:12:20 2024
             State : clean
    Active Devices : 2
   Working Devices : 2
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : resync

              Name : ubuntu:0  (local to host ubuntu)
              UUID : 96392d50:82158fec:ce097da1:81724f01
            Events : 17

    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   /dev/sdb
       1       8       32        1      active sync   /dev/sdc
chrichri@ubuntu:~$ mkfs.ext4 /dev/md0
mke2fs 1.44.1 (24-Mar-2018)
Impossible d'ouvrir /dev/md0 : Permission non accordée
chrichri@ubuntu:~$ sudo mkfs.ext4 /dev/md0
mke2fs 1.44.1 (24-Mar-2018)
Rejet des blocs de périphérique : complété
En train de créer un système de fichiers avec 510976 1k blocs et 128016 i-noeuds.
UUID de système de fichiers=7f5ee0b6-99d9-497f-a87a-0505e7d42e16
Superblocs de secours stockés sur les blocs :
        8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Allocation des tables de groupe : complété
Écriture des tables d'i-noeuds : complété
Création du journal (8192 blocs) : complété
Écriture des superblocs et de l'information de comptabilité du système de
fichiers : complété

chrichri@ubuntu:~$ lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
fd0      2:0    1    4K  0 disk
sda      8:0    0   16G  0 disk
└─sda1   8:1    0   16G  0 part  /
sdb      8:16   0  500M  0 disk
└─md0    9:0    0  499M  0 raid1
sdc      8:32   0  500M  0 disk
└─md0    9:0    0  499M  0 raid1
chrichri@ubuntu:~$ df /dev/md0
df: /dev/md0: Aucun fichier ou dossier de ce type
chrichri@ubuntu:~$ sudo mount /dev/md0 /mnt
chrichri@ubuntu:~$ df /dev/md0
Sys. de fichiers blocs de 1K Utilisé Disponible Uti% Monté sur
/dev/md0              484306      14     454648   1% /mnt