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Newly created mdadm raid 6 cannot be mounted

Unix & Linux Asked by Adam Barnett on January 2, 2022

I have a newly created mdadm raid 6 that was built using this command:

sudo mdadm --create --verbose /dev/md127 --level=6 --raid-devices=8 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /dev/sdo1 /dev/sdp1

it shows when I use lsblk:

sdi         8:128  0   7.3T  0 disk  
└─sdi1      8:129  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 
sdj         8:144  0   7.3T  0 disk  
└─sdj1      8:145  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 
sdk         8:160  0   7.3T  0 disk  
└─sdk1      8:161  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 
sdl         8:176  0   7.3T  0 disk  
└─sdl1      8:177  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 
sdm         8:192  0   7.3T  0 disk  
└─sdm1      8:193  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 
sdn         8:208  0   7.3T  0 disk  
└─sdn1      8:209  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 
sdo         8:224  0   7.3T  0 disk  
└─sdo1      8:225  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 
sdp         8:240  0   7.3T  0 disk  
└─sdp1      8:241  0   7.3T  0 part  
  └─md127   9:127  0  43.7T  0 raid6 

But I can’t mount it, istead I get this error:

$sudo mount /dev/md127 temp

NTFS signature is missing.
Failed to mount '/dev/md127': Invalid argument
The device '/dev/md127' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

What’s wrong? Thanks for any help.

One Answer

You seem to have forgotten to create a filesystem on that array after activating it.

Answered by eleventyone on January 2, 2022

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