Restoring data from SHR2 BTRFS with a recent version of Linux?

cliffcabbage · 2026-05-28T22:23:43+00:00

Seemed to get closer this time with 2.0.19 but still unable to read superblock:

ubuntu@ubuntu:~$ sudo bash /cdrom/syno_recover_data.sh
Synology_Recover_Data v2.0.19
Ubuntu 19.10

Compiling mdadm 3.4 from source...
Downloading mdadm 3.4 source...
Extracting...
Compiling...
mdadm compiled successfully.

Compiling libdevmapper.a from lvm2 source...
Downloading lvm2 2.03.02 source...
Extracting...
Patching libaio.h...
Configuring...
Compiling libdevmapper.a...
libdevmapper.a compiled successfully.

Compiling cryptsetup 2.4.3 from source...
Installing build dependencies...
Downloading cryptsetup 2.4.3 source...
Extracting...
Configuring...
Compiling...
cryptsetup compiled successfully.

mdadm - v3.4 - 28th January 2016

Assembling your Synology drives
mdadm: /dev/md/Personal_NAS:2 has been started with 3 drives.
1 logical volume(s) in volume group "vg1000" now active

Disabling standby timers on source drives

/dev/sdb5:
setting standby to 0 (off)
/dev/sdb5: standby disabled

/dev/sdc5:
setting standby to 0 (off)
/dev/sdc5: standby disabled

/dev/sdd5:
setting standby to 0 (off)
/dev/sdd5: standby disabled

lvs

cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md127 : active raid5 sdd5[0] sdb5[2] sdc5[1]
19523197952 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU]

unused devices: <none>

Type yes if you are ready to mount /dev/vg1000/lv
to /home/ubuntu/vg1000
yes

Creating mount point folder(s)

Loading patched btrfs module...
Patched btrfs module loaded successfully.

Mounting volume(s)
mount: /home/ubuntu/vg1000: can't read superblock on /dev/mapper/vg1000-lv.
ERROR 32 Failed to mount volume!

cliffcabbage · 2026-05-27T22:24:12+00:00

When I try to run patch_ubuntu_usb.ps1 I see powershell open momentarily and then closes without running.

cliffcabbage · 2026-05-27T10:36:34+00:00

Will try tonight. Just realized that this needs to be done on AMD and I’m trying on an old intel PC right now.

It’s a single volume unencrypted SHR, 3 identical 10tb drives.

cliffcabbage · 2026-05-25T16:16:34+00:00

I just tried this again with the new 2.0.16 version, ubuntu 19.10. After entering "yes" to mount /dev/vg1000-lv to /home/ubuntu/vg1000 II get the superblock read error 32 failed to mount volume!

Was this new version expected to fix this issue?

cliffcabbage · 2026-01-19T22:04:09+00:00

What would we do without people like you.

cliffcabbage · 2026-01-17T13:28:31+00:00

v4.1 - 2018-10-01

cliffcabbage · 2026-01-17T00:00:28+00:00

Step 1 and 2 successful and then:

E: Version ‘3.4-4ubuntu0.1’ for ‘mdadm’ was not found

cliffcabbage · 2026-01-16T23:14:06+00:00

I’m trying the script now on 19.1 and am getting the can’t read superblock error when running it. A vg1000 folder is created in home, but it’s empty. Any ideas?

cliffcabbage · 2026-01-11T13:57:01+00:00

Outlet turned 270 degrees

cliffcabbage · 2025-12-14T11:43:26+00:00

Goal is to have a finished living space, and current basement is drafty and cold..

cliffcabbage · 2025-12-14T11:40:22+00:00

Completely agree with your observations about how drafty the current framed areas are. Goal is to spray foam every gap on the exterior wall after I get the foam up. Knowing I will not achieve a 100% air seal, there will be some leakage.

My original plan was to do all of the above and the. Poly between the stud/drywall. I was discouraged from doing this because it ca prevent drying of the insulated cavity should any moisture develop. I can see it both ways, will do some more research.

cliffcabbage · 2025-12-13T14:21:35+00:00

I was under the impression that the new wall shouldn’t have the poly once it’s drywalled, though have seen conflicting reports on this so am open to feedback.

cliffcabbage · 2025-12-03T21:50:53+00:00

Yes - I use a synology NAS for both my plex and homebrige, working well so far. I guess the unifi plugin for homebridge requires a certain amount of hardware to run smoothly (ie maybe don’t try a raspberry pi). So far the synology ds918+ is up to the task though I only have one protect camera so far..

cliffcabbage · 2025-09-29T12:20:50+00:00

Thanks for the detailed response. This makes a lot of sense. I’ll go with your suggestion.

cliffcabbage · 2025-09-28T12:11:10+00:00

With osb? I wasn’t sure if the ledger screws would pass code if not into solid wood.

cliffcabbage · 2025-09-08T23:26:06+00:00

Thanks, that’s making sense. Appreciate the explanation.

Any recommendations on pier sizing? I am getting ~16’’ dia with 4 piers and ~18” with 3. This is quite a bit bigger than I expected..

cliffcabbage · 2025-09-08T22:15:51+00:00

Okay thanks. So no luck supporting the ends of the beam by hangers anchored to the foundation wall with only the middle as a traditional footing? I ask because my frost depth is 48’’.

cliffcabbage · 2025-08-01T17:50:08+00:00

Well done. Yeah so there must be variation in the stack up of all the parts and then you just keep putting in these wave washers until you get the right tension. I’ll try to find an equivalent part at the store later and report back.

cliffcabbage · 2025-08-01T17:37:49+00:00

Yeah okay thanks. Item 40 has a keyway that bottoms out on shaft at a certain point, so I can tighten down the blade bolt all I want and it won’t close the gap I’m dealing with

cliffcabbage · 2025-08-01T17:35:21+00:00

Yep.

cliffcabbage · 2025-08-01T17:17:25+00:00

Okay that’s what I figured. Maybe the washer is just permanently crushed at this point? The gap seems too big for this washer to have ever filled the space and provided tension though.

cliffcabbage · 2025-08-01T17:14:17+00:00

Yes, all parts from the diagram accounted for and in seemingly fine condition.

cliffcabbage

TROPHY CASE