Few weeks ago I set up a home server using Ubuntu Server. In addition to a small SSD drive, it has a pair of 3TB WD Reds which are supposed to be in a mirrored RAID configuration. I followed this tutorial and everything seemed to work out fine. After mounting the resulting md0 device, I got a 3TB drive as expected. I copied about 2TB of data there and left it as it was. Now a week or two later, all the data seems to be gone and I can't figure out what happened. I am primarily a Windows user, so a lot of this stuff is quite confusing to me.
mdstat suggests the RAID array is working
cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdc sdb 2930135488 blocks super 1.2 [2/2] [UU] bitmap: 0/22 pages [0KB], 65536KB chunk
df is super confusing to me (
ls /mnt/md0 returns empty)
df /mnt/md0 Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/matej--server--vg-root 98049684 7840560 85205452 9% /
mdadm detail also suggests everything is okay
sudo mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Sun Oct 2 00:06:19 2016 Raid Level : raid1 Array Size : 2930135488 (2794.40 GiB 3000.46 GB) Used Dev Size : 2930135488 (2794.40 GiB 3000.46 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Fri Oct 7 02:01:48 2016 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : matej-server:0 (local to host matej-server) UUID : 60012283:78eb25cb:8868aede:f515fbef Events : 6754 Number Major Minor RaidDevice State 0 8 16 0 active sync /dev/sdb 1 8 32 1 active sync /dev/sdc
Did I make some error configuring the RAID or did something go horribly wrong afterwards?