La carte RAID signale qu'elle est en mode dégradé :
megacli -AdpAllInfo -aAll :

                Device Present
                ================
Virtual Drives    : 1 
  Degraded        : 1 
  Offline         : 0 
Physical Devices  : 9 
  Disks           : 8 
  Critical Disks  : 0 
  Failed Disks    : 0 

Voir le disque en défaut : megacli -PDList -aALL |egrep "Enclosure|Slot|state" :

Enclosure Device ID: 32
Slot Number: 0
Firmware state: Online, Spun Up
Enclosure Device ID: 32
Slot Number: 1
Firmware state: Online, Spun Up
Enclosure Device ID: 32
Slot Number: 2
Firmware state: Online, Spun Up
Enclosure Device ID: 32
Slot Number: 3
Firmware state: Online, Spun Up
Enclosure Device ID: 32
Slot Number: 4
Firmware state: Online, Spun Up
Enclosure Device ID: 32
Slot Number: 5
Firmware state: Unconfigured(good), Spun Up
Enclosure Device ID: 32
Slot Number: 6
Firmware state: Online, Spun Up
Enclosure Device ID: 32
Slot Number: 7
Firmware state: Online, Spun Up

Le disque 5 a donc un problème : il n'est pas configuré !
La commande megacli -CfgDsply -a0 le confirme (aucune configuration) :

Physical Disk: 5

Récupérer les paramètres nécessaires à la réintégration : megacli -PDGetMissing -aAll :

    Adapter 0 - Missing Physical drives

    No.   Array   Row   Size Expected
    0     0       5     3814912 MB

Ajouter le disque dans le pool (Enclosure:Slot deux commandes au dessus, array, row et adapter dans la commande au dessus) : megacli -PdReplaceMissing -PhysDrv[32:5] -array0 -row5 -a0 :

Adapter: 0: Missing PD at Array 0, Row 5 is replaced.

Reconstruire le RAID : megacli -PDRbld -Start -PhysDrv[32:5] -a0 :

Started rebuild progress on device(Encl-32 Slot-5)

Vérifier que le RAID est bien en cours de reconstruction : megacli -PDList -aALL |egrep "Enclosure|Slot|state" :

Slot Number: 0
Firmware state: Online, Spun Up
Slot Number: 1
Firmware state: Online, Spun Up
Slot Number: 2
Firmware state: Online, Spun Up
Slot Number: 3
Firmware state: Online, Spun Up
Slot Number: 4
Firmware state: Online, Spun Up
Slot Number: 5
Firmware state: Rebuild
Slot Number: 6
Firmware state: Online, Spun Up
Slot Number: 7
Firmware state: Online, Spun Up

Pour voir le pourcentage de reconstruction : megacli -PDRbld -ShowProg -PhysDrv[32:5] -a0 :

Rebuild Progress on Device at Enclosure 32, Slot 5 Completed 1% in 7 Minutes.

Si tout va bien, la commande megaraidsas-status est aussi disponible :

-- Arrays informations --
-- ID | Type | Size | Status
a0d0 | RAID 5 | 25TiB | DEGRADED

-- Disks informations
-- ID | Model | Status | Warnings
a0e32s0 | TOSHIBA MG04SCA40EN 3726GiB | online | errs: media:18 other:0
a0e32s1 | SEAGATE ST4000NM0295 3726GiB | online | errs: media:2 other:0
a0e32s2 | WD WD4001FYYG 3726GiB | online | errs: media:3 other:0
a0e32s3 | SEAGATE ST4000NM0295 3726GiB | online | errs: media:2 other:0
a0e32s4 | SEAGATE ST4000NM0295 3726GiB | online | errs: media:2 other:0
a0e32s5 | WD WD4001FYYG 3726GiB | rebuild | errs: media:0 other:4
a0e32s6 | TOSHIBA MG04SCA40EN 3726GiB | online
a0e32s7 | WD WD4001FYYG 3726GiB | online | errs: media:1 other:0

There is at least one disk/array in a NOT OPTIMAL state.

Basé sur https://mnt-tech.fr/blog/firmware-state-unconfiguredgood-spun-up/