recovering two volumes - JBOD - SHR - find config info

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recovering two volumes - JBOD - SHR - find config info

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Hi,

Recently disaster struck and I lost access to my 8 x 8TB disks on my DS
I'm looking for help to find the synology config files that contain:
  • volume information
  • SHR information

Some detail:
- Through accident one of the 8 disktrays got ejected

What I tried to do:
  • connect all 8 x 8 TB drives to a PC running ubuntu, 18.04 and also 20.04.
  • ran TestDisk but could not resolve the issue
  • ran DiskDrill (windows version) using Windows 10

I'm 98% sure that all data is still present and can be rescued.
I'm also quite sure that DiskDrill can do it, but I think I run into memory issues that cause DiskDrill to crash.
Why do I think that my data can be rescued:
- Running DiskDrill, I get a Windows Explorer style file list that reveals all the files. I can even stop DiskDrill from scanning and copy selected files to e.g. a network location.

Now to my synology conf question:
  • I don't have the correct information about my 8 disk configuration at hand.
  • some research and memory suggests that I had 2 volumes, I think 1 volume consisted of 2 drives, and the second volume consisted of 6 drives.
  • I think one volume was JBOD and the other SHR

If I'm not mistaken the config information should be present on my disks.
All disks show the same partitioning:
/dev/sdb1 - linux raid - 2.37 GiB ( I think this is boot partition)
/dev/sdb2 - linux raid - 2.00 GiB (I think this is swap)
/dev/sdb3 - linux-raid - 7.27 TiB - label: DS2:3

I would like to find:
  • config file of JBOD volume
  • config file of SHR volume
  • identification of harddrive, meaning the number within the JBOD / SHR

Any help or pointer will be hugely appreciated!!
Thanks for helping out!!


Below you will find my original post on synology forums.
-----------------------------------------------------------------
Code:
Recently disaster struck unfortunately.
I have a couple of DiskStations in my garage for local network storage, a 2 bay, 5 bay and 8 bay model.

A loose pending electrical cable to be installed, inadvertently struck on one of the drive doors and ejected the hard drive.
As a result, DiskStation signalled data lost. (Don't remember the exact terminology) and showed 8 disks present but without data.

My reasoning that this would be quite impossible, and that (most) data should be present, but maybe not immediately visible.

So I set out to search for solutions and found a Synology KB article describing how to use Ubuntu desktop to read data on DiskStation disks. I purchased a 6 sata port controller, and together with the on-board sata ports of a standard PC, I installed Ubuntu 20.04.1 to a small ssd, wired up an additional PSU, and connected the 8 drives of the 8 bay DiskStation.

I first used Gparted to have a quick look at the drives, and this shows one drive that has a problem.
I then set out to use TestDisk from Christophe Grenier, but did not continue that path as I don't fully know how to use TestDisk, and want to avoid causing more damage.

Now to my question:
I don't know the exact volume(s) configuration. From old screenshots I think that my DiskStation was configured with two volumes, one comprised out of two 8 TB disks and a second one comprised out of 6 x 8TB disks.

Since I can access my 8 hard drives using ubuntu, can I somewhere recover the volume configuration?
I know that one can make a backup of the configuration of a DiskStation, but I do not have this at hand.

See below image of Gparted.
Thanks a lot for helping out!
 

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If there are 3 partitions, and one of them is JBOD, to me it does not seem likely that there was also a SHR volume.
If one of these was SHR, you would not see empty disks.

As JBOD has no redundancy, the loss of one disk may cause loss of all your data files. Recovery of the JBOD is not so likely.
You may be lucky for a considerable number of files, that should be visible in Linux and may be (as a file) completely on one disk. If a file is split over multiple disks, there is probably no way to recover these.

Honestly, the use of JBOD, without backup, is one of the easiest way to loose all your data.
 
Thanks for replying!
Learning the hard way, I know. At a particular moment in the past I started backing up to BackBlaze, but off course the time needed is not very realistic in case of around 50 ~ 60 TB.

My goal is to renew our garden house and then to put one of my other Synology's there. Then do backup and mirroring. Not entirely thought through yet, because it will take at least another year to get there.

So no pointer to where the config files are stored? Or what they are named?
 

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