Unable to read data from RAID partition

[houghi <houghi@houghi.org>]

If I have not given enough information or if another place is better to
ask, please let me know.

I have a QNAP NAS and I have replaced one drive because I thought I would
just plug in the HD in my machine, boot it and mount the device.

I have done so in the past, but now it does not seem to work anymore.
This due to the fact that drives are now standard in RAID and not just
ext3 or ext4 anymore. I removed the drive, because the other drive that
contained the same data failed. So I had the data twice on two separate
drives and now I have none. Just adding it to the QNAP does not work
either.

I would like to be able to mount /dev/sdc3 and retrieve the data.
I run Debian GNU/Linux 8 (jessie)

Here is some of the output:
root@penne : fdisk -l /dev/sdc

Disk /dev/sdc: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 7968AD58-41D8-48EA-A55B-AE1EF3689B68

Device          Start        End    Sectors   Size Type
/dev/sdc1          40    1060289    1060250 517.7M Microsoft basic data
/dev/sdc2     1060296    2120579    1060284 517.7M Microsoft basic data
/dev/sdc3     2120584 2912488109 2910367526   1.4T Microsoft basic data
/dev/sdc4  2912488112 2913548399    1060288 517.7M Microsoft basic data
/dev/sdc5  2913548408 2930255999   16707592     8G Microsoft basic data

The data is on /dev/sdc3

root@penne : cat /proc/mdstat
Personalities : [raid1]
md124 : active raid1 sdc3[0]
      1455183616 blocks super 1.0 [1/1] [U]
            
unused devices: <none>


The raid1 device is /dev/md124

root@penne : mdadm --detail /dev/md124
/dev/md124:
        Version : 1.0
  Creation Time : Sat Oct 10 01:30:57 2015
     Raid Level : raid1
     Array Size : 1455183616 (1387.77 GiB 1490.11 GB)
  Used Dev Size : 1455183616 (1387.77 GiB 1490.11 GB)
   Raid Devices : 1
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Sun Oct 25 13:10:43 2015
          State : clean
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : 4
           UUID : d358edc1:b9272da7:e071f2f0:0462cd1f
         Events : 10

    Number   Major   Minor   RaidDevice State
       0       8       35        0      active sync   /dev/sdc3


When I try to mount :
root@penne : mount /dev/sdc1 /mnt/1/
mount: unknown filesystem type 'linux_raid_member'
root@penne : mount /dev/md124 /mnt/3
mount: unknown filesystem type 'drbd'

I have removed and added it with
root@penne : mdadm --manage /dev/md124 --stop
mdadm: stopped /dev/md124
root@penne : mdadm --assemble /dev/md124 /dev/sdc3
mdadm: /dev/md124 has been started with 1 drive.

All to no avail.

I have searched the past week and am not able to figure out how to mount
the partition. Any help would be appreciated.

houghi