mount: unknown filesystem type 'linux_raid_member'

Question

I have Suse Linux 12.1 and i am trying to mount a single RAID 1 disk, to explore the files in it. However when mounting it:

 # mount /dev/sdc1 /mnt/test
  mount: unknown filesystem type 'linux_raid_member'

I started reading around and many advised to just force the filessystem type

  # mount -t ext4 /dev/sdc1 /mnt/test
  mount: /dev/sdc1 already mounted or /mnt/test busy

when trying

 umount /dev/sdc1                 
 umount: /dev/sdc1: not mounted

Could someone provide some advise?

I am running my machines insed an ESXI server and it is a virtual disk. However this should not play, as this disks are not used by any other machines

thaknks!

can you please post the output of fdisk -l ? – Feiticeir0 Apr 26 '12 at 10:52 — Feiticeir0, Apr 26 '12 at 10:52

score 66 · Accepted Answer · answered Apr 26 '12 at 11:22

66

You should not mount it directly using mount. You need first to run mdadm to assemble the raid array. A command like this should do it:

$ mdadm --assemble --run /dev/md0 /dev/sdc1

If it refuses to run the array because it will be degraded, then you can use --force option. This is assuming you don't have /dev/md0 device. Otherwise, you need to change this name.

When this command is executed successfully, you can mount the created device normally using:

$ mount /dev/md0 /mnt/test

answered Apr 26 '12 at 11:22

Khaled

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In my case it does not work when I take 1 HDD only. Before is RAID 1 for 2 HDD – tquang Jan 20 '15 at 01:36
@tquang: Can you post the error message? – Khaled Jan 20 '15 at 08:05
How do you 'remove' the created /dev/md* ? – quimnuss Jun 12 '15 at 13:15
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@quimnuss: You can use `mdadm --stop /dev/mdx` – Khaled Jun 13 '15 at 07:11
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If anyone still gets the `mdadm: /dev/sdb1 is busy - skipping message` you can stop the device on with `mdadm --stop /dev/mdx` or check the `/proc/mdstat` to check if the device was automatically mount by your system. – altmas5 Nov 27 '15 at 16:29
# mdadm --assemble --run /dev/md3 /dev/sdb5 mdadm: /dev/md3 has been started with 1 drive.unknown filesystem type 'LVM2_member'. – user1767316 Jun 27 '22 at 19:46

mount: unknown filesystem type 'linux_raid_member'

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