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I'm trying to follow this https://kb.synology.com/en-uk/DSM/tutorial/How_can_I_recover_data_from_my_DiskStation_using_a_PC#x_anchor_encryptedvolume

sudo -i apt-get update apt-get install -y mdadm lvm2 mdadm -AsfR && vgchange -ay mdadm: Found some drive for an array that is already active: /dev/md/brayc:2 mdadm: giving up. mdadm: No arrays found in config file or automatically cat /proc/mdstat Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : active raid1 sdb3[1] 3902196544 blocks super 1.2 [2/1] [_U] lvs mount /dev/md127 /home/ubuntu/nas mount: /home/ubuntu/nas: uknown filesystem type 'LVM2_member'. dmesg(1) may have more information after failed mount system call

But I have problems when I run the mount command

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You are using LVM so on top of your RAID array is a LVM physical volume which you cannot mount, you need to mount the LVM logical volume (LV). Use lvs to find the name of the volume (or lsblk) and then mount the logical volume with mount /dev/<vgname>/<lvname> /home/ubuntu/nas.

Your lvs output will look like this:

$ sudo lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert home fedora -wi-ao---- 822,66g root fedoraa -wi-ao---- <69,99g

first column is your LV name, second your VG name. So with my setup I'd be using /dev/fedora/home to mount my home LV.

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