Any Hope Of Recovery?

English Storage
1

Hi,

Looking for guidance on whether this situation can be salvaged. (I have a support ticket with QNAP and awaiting their response)

My 4 thin volumes are unmounted. They are showing as still having content, but as the attached photo shows the storage pool itself is showing as blank.

IMG_8759
IMG_87591170×1652 137 KB

I’ve tried checking the volumes and it fails at around 25%. Also tried scanning the drives for bad blocks.

Just looking to understand if there’s any likelihood of recovering the situation of if I should just get on with rebuilding the storage and restoring data from backups.

Appreciate any thoughts.

2

What is the underlying disk setup ? (disk number/ RAID level)

And (as always) an expensive or tearful lesson to learn, do backups (!)

3

Hi,

There’s 4 disks in raid 5 configuration.

I have the most critical (non replaceable) data backed up and can replace the rest, so all is not lost if I have to rebuild the drives/volumes

Cheers

4

If you can login to SSH do a

sudo md_checker
(post back the results)

if everything is OK there, QNAP support can probably just issue an LVM reset to get the volumes back.

5 
Welcome to MD superblock checker (v2.0) - have a nice day\~

Scanning system...
RAID metadata found!
UUID:		e799736d:892973a4:089251f6:ade8aaa9
Level:		raid5
Devices:	4
Name:		md1
Chunk Size:	512K
md Version:	1.0
Creation Time:	Aug 16 21:26:52 2019
Status:         **ONLINE** (md1) [UUUU]
===============================================================================================
Enclosure | Port | Block Dev Name | # | Status |   Last Update Time   | Events | Array State
===============================================================================================
NAS_HOST       1        /dev/sdb3   0   Active   Sep 14 22:00:57 2026   439747   AAAA                     
NAS_HOST       2        /dev/sda3   1   Active   Sep 14 22:00:57 2026   439747   AAAA                     
NAS_HOST       3        /dev/sdd3   2   Active   Sep 14 22:00:57 2026   439747   AAAA                     
NAS_HOST       4        /dev/sdc3   3   Active   Sep 14 22:00:57 2026   439747   AAAA                     
===============================================================================================
6

That looks good (RAID is intact and all drives are in sync)

I am hesitant to give you the command to reset the LVM, just in case QNAP support has a better idea. (If they don’t, me or someone else can post it )

7

Thank you very much for your help. I’ll give QNAP another day or so to respond to the latest info in the ticket. It’s sounding promising…

Cheers,

8

We’ll continue to assist you through the support ticket. If you have any other questions, feel free to let us know. Thanks!