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In 2 weeks times, I lost a disk twice in my synology DS210.

First time, the disk was truly giving signs of imminent death.
Because I was using SHR (synology hybrid raid), I could not mount my disk under my ubuntu.

So this is how I got my datas back (right before the disk died for good).
The disk is mounted thru a USB dock bay onto my synology.

-1: locate your disk and raid partition with fdisk -l,
you should get something like this :
/dev/sdx3 588 19457 151569760+ fd Linux raid autodetect

-2: ensure this partition actually contains an MD device with mdadm –examine –scan /dev/sdx3,
you should something like that :
ARRAY /dev/md3 level=raid1 num-devices=2 UUID=db7c8f07:6f0f4570:852c2e22:a378fec9

-3: locate your last active MD device with mdadm –detail –scan,
you should get something like :
ARRAY /dev/md1 metadata=0.90 UUID=f07f5754:cf6f8af4:663cbd89:1480ea74
ARRAY /dev/md2 metadata=1.1 name=ds201j:2 UUID=17f442a7:d767633b:a4fc4e5b:88db9d4b

-> you want to use next free MD device which is MD3.

-4: create a MD device pointing to your partition with mdadm -A –verbose –run /dev/md3 /dev/sdx3

-5 : now mount it with mount /dev/md3 /mnt/usb

You can now retrieve your files in /mnt/usb !!!

Now, like I told you at the beginning at this article, I lost 2 disk in a row in a week time.
The second time, the method above did not work 🙁
This time, UFS Explorer saved my datas.

Hope this can help others…

 Posted by at 20 h 12 min

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Thank you very much for your step by step guide. Some notes: In your comments, the « — » gets replaced by a « – ». I was able to mount my Synology disk, but had to do some extra steps: > mount /dev/md1 /media/usb/ mount: unknown filesystem type ‘LVM2_member’ So I did a > pvs PV VG Fmt Attr PSize PFree /dev/md1 vg1 lvm2 a– 927.00g 0 and > lvdisplay vg1 — Logical volume — LV Path /dev/vg1/lv LV Name lv VG Name vg1 LV UUID 1irtss-N0Cb-wbbZ-4Pkn-a0HM-Z2Mi-zQ41Hj LV Write Access read/write LV Creation host, time , LV Status NOT available LV Size 927.00… Read more »