How could I mount a Asustor NAS (EXT4 Raid1) partition to uBuntu?

Question

I was using an Asustor NAS (Rubbish NAS) which was dead.  It was running a RAID 1 and the hard drives were in good health.  I unplugged the disk and put it onto an external USB adapter and do a fdisk -l.  I got the following result:
Device       Start         End     Sectors  Size Type

/dev/sdd1     2048      524287      522240  255M Linux filesystem

/dev/sdd2   524288     4718591     4194304    2G Linux RAID

/dev/sdd3  4718592     8912895     4194304    2G Linux RAID

/dev/sdd4  8912896 19532871679 19523958784  9.1T Linux RAID

I put in:
mkdir /media/mymount
Then I put in:
mount /dev/sdd4 /media/mymount/
However, the system replied:
mount: /media/rav: special device /dev/sdd3 does not exist.
I tried sdd1-sdd4 and they all gave me the same result.
What possibly is the problem?
Please help.

Fong Ram · Answer

Thanks for your answer.
I have also found that there are software you could install some software and then the partition could be mounted. By running the command below, the partition is accessible.

apt-get install mdadm
apt-get install lvm2
mdadm -Asf && vgchange -a

matteo nunziati · Answer

Partitions are defined as RAID not as a proper filesystem. You can't directly mount them. You need to create a raid device first.
Try this how to: https://blog.sleeplessbeastie.eu/2012/05/08/how-to-mount-software-raid1-member-using-mdadm/

How could I mount a Asustor NAS (EXT4 Raid1) partition to uBuntu?

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