I recently did a fresh install of Ubuntu Server 18.04 over my old 16.04 install. I had a Raid1 config in my old setup, which I administered through mdadm. It seems as if my Raid1 config is still present in the 18.04 install (see below).
NAME FSTYPE SIZE MOUNTPOINT LABEL loop0 squashfs 86.9M /snap/core/4917 loop1 squashfs 87M /snap/core/5145 sda 57.6G ├─sda1 1M └─sda2 ext4 57.6G / sdb 1.8T └─sdb1 linux_raid_member 1.8T homeserver:0 └─md0 ext4 1.8T /media/raiddrives sdc 1.8T └─sdc1 linux_raid_member 1.8T homeserver:0 └─md0 ext4 1.8T /media/raiddrives sdd 931.5G └─sdd1 ext4 931.5G sr0 1024M
My question is: What do I need to do in order to have this Raid1 working as before? Do I need to update the mdadm.conf or is it enough just to mount the md0 drive the way it was before? I have now temporarily mounted it at /media/raiddrives.
While I am at it, I would like to post a different but somehow related question. Can I use my current Raid1 config if I where to setup only a Raspberry Pi Owncloud server with e.g. Ubuntu Core? What would be the optimal setup for a NAS using the existing Raid?