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I see the disk with lsblk, but in the output of df -h.
How do I mount the disks? If I remember correctly it is an ext4 stripe.

I tried mount /dev/sda /folder, it says unknown filesystem type 'linux_raid_member'.

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    You have to use the resulting md device and not the /dev/sd* devices directly to mount the RAID volume. Look into /proc/mdstat to find the name of the RAID device to use for your mount command. That should be something like /dev/md0 ... /dev/md127. Also depending if you have partitioned the RAID device you have to use the partitions on that device or in case you have placed a LVM on top you should use the LVM for your mount command. Use lvdisplay to find LVMs.
    – Thomas
    Commented May 21, 2018 at 17:38
  • @Thomas Why don't you make that an answer? Commented May 21, 2018 at 20:00

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You have to use the resulting md device and not the /dev/sd* devices directly to mount the RAID volume.

Look into /proc/mdstat to find the name of the RAID device to use for your mount command. That should be something like /dev/md0.../dev/md127.
Also depending if you have partitioned the RAID device you have to use the partitions on that device or in case you have placed a LVM on top you should use the LVM for your mount command. Use lvdisplay to find LVMs.

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