I have a Synology NAS with two 3Tb disks in RAID1 (sda+sdb).

The output of /proc/mdstat is:

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md2 : active raid1 sda3[0] sdb3[1]
      2925544256 blocks super 1.2 [2/2] [UU]

md1 : active raid1 sdb2[1] sda2[0]
      2097088 blocks [10/2] [UU________]

md0 : active raid1 sdb1[1] sda1[0]
      2490176 blocks [10/2] [UU________]

unused devices: <none>

I have added another two 3Tb disks (sdc and sdd).

I would like if possible to convert the raid1 to raid10.

I have seen guides on google on how to do this either by:

Creating a RAID10 with the two new disks and specifying two disks as
missing. Remove one old disk, sync and then add the fourth and final
disk; OR

Another method outlined here:

My issue is that I actually have md0 md1 and md2 (presumably because
there are partitions which hold the OS for the NAS).

Can I still do this grow operation?

Is anyone able to help me through this please?

Thanks in advance