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celtos

Monter en external USB 1 des 2 disques RAID1 d'un NAS Synology

Bonjour et bonne année !

Mon NAS Synology à rendu l'âme (il fait disjoncter le tableau électrique !)  mais les disques en RAID1 sont intacts.
J'essaye de monter un des disque via un adaptateur SATA-USB pour récupérer le contenu, je vois bien le disque mais je galère à le monter, il y a qques chose que je ne dois pas bien faire dans la construction du RAID.

Le disque est en /dev/sda, et je veux monter la partition 3, ie /dev/sda3 :

sudo fdisk -l
...
Disk /dev/sda: 1,82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: Generic         
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x2e860600

Device     Boot   Start        End    Sectors   Size Id Type
/dev/sda1            63    4980149    4980087   2,4G fd Linux raid autodetect
/dev/sda2       4980150    6024374    1044225 509,9M fd Linux raid autodetect
/dev/sda3       6281415 3907024064 3900742650   1,8T fd Linux raid autodetect

Partition 1 does not start on physical sector boundary.
Partition 2 does not start on physical sector boundary.
Partition 3 does not start on physical sector boundary.

Je construit un array RAID avec seulement 1 des 2 disques en /dev/md0 :

sudo mdadm --create /dev/md0 --raid-devices=2 --level=1 /dev/sda3 missing
mdadm: /dev/sda3 appears to contain an ext2fs file system
       size=1950371200K  mtime=Thu Feb 16 18:27:31 1911
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.

mdadm semble Ok :

sudo mdadm --examine /dev/sd*
/dev/sda:
   MBR Magic : aa55
Partition[0] :      4980087 sectors at           63 (type fd)
Partition[1] :      1044225 sectors at      4980150 (type fd)
Partition[2] :   3900742650 sectors at      6281415 (type fd)
mdadm: No md superblock detected on /dev/sda1.
mdadm: No md superblock detected on /dev/sda2.
/dev/sda3:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : 841a9d3b:401e79a8:dda0d7d8:24f6bb31
           Name : yle-HP202411:0  (local to host yle-HP202411)
  Creation Time : Fri Jan  3 14:45:32 2025
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 3900478458 sectors (1859.89 GiB 1997.04 GB)
     Array Size : 1950239168 KiB (1859.89 GiB 1997.04 GB)
  Used Dev Size : 3900478336 sectors (1859.89 GiB 1997.04 GB)
    Data Offset : 264192 sectors
   Super Offset : 8 sectors
   Unused Space : before=264112 sectors, after=122 sectors
          State : active
    Device UUID : 96444d79:841997e0:3461eafa:e5f2e563

Internal Bitmap : 8 sectors from superblock
    Update Time : Fri Jan  3 14:45:32 2025
  Bad Block Log : 512 entries available at offset 16 sectors
       Checksum : 7f46f641 - correct
         Events : 0


   Device Role : Active device 0
   Array State : A. ('A' == active, '.' == missing, 'R' == replacing)

Donc j'assemble le RAID :

sudo mdadm --assemble --readonly /dev/md0 /dev/sda3
mdadm: /dev/md0 has been started with 1 drive (out of 2).

A cette étape le RAID me parait fini, non ?

Donc j'essaye de monter la partition /dev/md0 :

sudo mount /dev/md0 /mnt/disk 
mount: /mnt/disk: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error.
       dmesg(1) may have more information after failed mount system call.

dmesg :

[ 7590.987396] EXT4-fs (md0): VFS: Can't find ext4 filesystem

Même message avec -t options : ext2, ext3, btrfs ...

lsblk -f

NAME                FSTYPE            FSVER    LABEL UUID                                   FSAVAIL FSUSE% MOUNTPOINTS
sda                                                                                                        
├─sda1              linux_raid_member 0.90.0         b51b784c-429f-ce19-c4ee-86b89aa5bc1a                  
├─sda2              linux_raid_member 0.90.0         c1a2aad6-e324-b0a0-c44f-a1ff69c21353                  
└─sda3              linux_raid_member 0.90.0         5a827f2d-0f7e-b097-9155-809b0da8f21d                  
  └─md0   

celtos

Re : Monter en external USB 1 des 2 disques RAID1 d'un NAS Synology

J'ai trouvé le problème !!!
C'est une histoire de version de metadata --metadata=0.9

Je laisse le post pour les prochains en galère !

sudo mdadm --create /dev/md0 --raid-devices=2 --level=1 --metadata=0.9 /dev/sda3 missing
mdadm: /dev/sda3 appears to contain an ext2fs file system
       size=1950371200K  mtime=Thu Feb 16 18:27:31 1911
Continue creating array? y
mdadm: array /dev/md0 started.

cat /proc/mdstat                                                                        

Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid1 sda3[0]
      1950371200 blocks [2/1] [U_]
      bitmap: 15/15 pages [60KB], 65536KB chunk

unused devices: <none>

sudo mdadm --examine /dev/sd*
/dev/sda:
   MBR Magic : aa55
Partition[0] :      4980087 sectors at           63 (type fd)
Partition[1] :      1044225 sectors at      4980150 (type fd)
Partition[2] :   3900742650 sectors at      6281415 (type fd)
mdadm: No md superblock detected on /dev/sda1.
mdadm: No md superblock detected on /dev/sda2.
/dev/sda3:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : f65e01b8:f226c7c5:886f79b9:2f1f81cf (local to host yle-HP202411)
  Creation Time : Fri Jan  3 16:51:29 2025
     Raid Level : raid1
  Used Dev Size : 1950371200 (1860.02 GiB 1997.18 GB)
     Array Size : 1950371200 (1860.02 GiB 1997.18 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Fri Jan  3 16:51:29 2025
          State : active
Internal Bitmap : present
 Active Devices : 1
Working Devices : 1
 Failed Devices : 1
  Spare Devices : 0
       Checksum : 8c6f720c - correct
         Events : 1


      Number   Major   Minor   RaidDevice State
this     0       8        3        0      active sync   /dev/sda3

   0     0       8        3        0      active sync   /dev/sda3
   1     0       0        0        0      spare

sudo mount /dev/md0 /mnt/disk