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Cannot Mount Synology disk raid 10 on ubuntu 20.04.3

nl flag

I'm trying to mount my 4x4TB disks with btrfs file system and raid 10 from a Synology NAS that won't start. I've followed this guide from Synology kb: https://kb.synology.com/sv-se/DSM/tutorial/How_can_I_recover_data_from_my_DiskStation_using_a_PC All the pre-requisite are satisfied so I've mounted my four disks on a tower pc, run live Ubuntu 20.04.3 desktop from usb key and write the command from the guide.

Installed mdadm and lvm2, all ok.

root@ubuntu:~# mdadm -Asf && vgchange -ay mdadm: /dev/md/2 has been started with 4 drives.

Seems to work (lvs have no output):

`root@ubuntu:~# cat /proc/mdstat Personalities : [raid10] md2 : active raid10 sda3[0] sdd3[3] sdb3[2] sdc3[1] 7804393088 blocks super 1.2 64K chunks 2 near-copies [4/4] [UUUU]

unused devices: root@ubuntu:~# lvs`

The mount passage didn't work:

root@ubuntu:~# mount /dev/md2 /home/ubuntu/test -o ro mount: /home/ubuntu/test: can't read superblock on /dev/md2.

Don't know why. Health of the disks is excellent, all are recognized, active with superblock persistent...so why Ubuntu can't read it? Thanks in advance for the support on this.

24601 avatar
in flag
is there any useful content in [this article](https://www.howtogeek.com/318018/how-to-set-up-and-get-started-with-your-synology-nas/)? I used it to help set up my Synology NAS using SAMBA and cifs to achieve it with appropriate entries in fstab. I also found the [Synology Forum](https://community.synology.com/enu/forum/1) quite helpful.
nl flag
I didn't find anything helpful for my case. The Synology NAS is broken and I'm trying to recover data from 4 disks on a PC as suggested by Synology but it didn't work. I've write also on Synology forum, hope this helps.
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