FĂ©v 112014

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

  One Response to “Synology (mis)adventures”

  1. 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

    > 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 GiB
    Current LE 237311
    Segments 1
    Allocation inherit
    Read ahead sectors auto

    Note the line
    LV Status NOT available

    This means I first had to activate it:
    > vgchange -ay
    1 logical volume(s) in volume group « vg1 » now active

    Now it was active:
    > lvdisplay vg1

    LV Status available

    After that, I successfully could mount it:
    > mount /dev/vg1/lv /media/usb/

    Note also that you should « clean up » afterwards:
    > umount /dev/vg1/lv
    > mdadm –remove /dev/md1

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