Direct access to a disk which was part of RAID 1
 

Hello,
my (QNAP) NAS is not working anymore and I need to access my data. I tried with some Recovery Software in Windows, but they can't see my directories structure. So I'm trying with Ubuntu.
There are two WD RED 8TB and I can connect one of them at time to my Laptop with Ubuntu.
Under Disks I see the volume has 5 partitions, all of them Partition Data: Basic Type and Content: Linux RAID Member (version 1.0).

fdisk -l:
Disk /dev/sdb: 7,3 TiB, 8001563222016 bytes, 15628053168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 33553920 bytes
Disklabel type: gpt
Disk identifier: 41F79514-1F45-47BA-BFA1-45F2FE9602CD

Device Start End Sectors Size Type
/dev/sdb1 40 1060289 1060250 517,7M Microsoft basic data
/dev/sdb2 1060296 2120579 1060284 517,7M Microsoft basic data
/dev/sdb3 2120584 15610264109 15608143526 7,3T Microsoft basic data
/dev/sdb4 15610264112 15611324399 1060288 517,7M Microsoft basic data
/dev/sdb5 15611324408 15628031999 16707592 8G Microsoft basic data

Disk /dev/md13: 448,1 MiB, 469893120 bytes, 917760 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/md256: 517,7 MiB, 542834688 bytes, 1060224 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/md1: 7,3 TiB, 7991369334784 bytes, 15608143232 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/md322: 6,9 GiB, 7408779264 bytes, 14470272 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/md9: 517,6 MiB, 542769152 bytes, 1060096 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes


mdadm --examine /dev/sdb3

Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 2e881376:26727080:eb4b694c:a4ec3ed2
Name : 1
Creation Time : Fri Aug 10 14:15:35 2018
Raid Level : raid1
Raid Devices : 2

Avail Dev Size : 15608143240 (7442.54 GiB 7991.37 GB)
Array Size : 7804071616 (7442.54 GiB 7991.37 GB)
Used Dev Size : 15608143232 (7442.54 GiB 7991.37 GB)
Super Offset : 15608143504 sectors
Unused Space : before=0 sectors, after=264 sectors
State : clean
Device UUID : d85a8d70:5d753f6d:5891a6b1:f1bc9252

Update Time : Fri Sep 28 19:15:21 2018
Bad Block Log : 512 entries available at offset -8 sectors
Checksum : 3e379ee1 - correct
Events : 221

Device Role : Active device 0
Array State : AA ('A' == active, '.' == missing, 'R' == replacing)

Under files I can access md9 and md13, but not md1. How can I do to access it? I have to assemble?
Thanks a lot.

So the same happens with both disks (separately) ?. What messages do you get as the (degraded) arrays are built at boot ?.
The NAS failed for some reason - the volume with the most data is most likely to be the reason or the victim.

Thank you for your reply and sorry for my delay, it's causing me a lot of trouble.
Yes it happens with both disks. I got this error for both HDDs:
WARNING: Unrecognized segment type tier-thin-pool
LV tp1, segment 1 invalid: does not support flag ERROR_WHEN_FULL. for tier-thin-pool segment.
Internal error: LV segments corrupted in tp1.

Any idea of what is it?

I would expect current Ubuntu to have LVM with thin-pool support, but I haven't looked at it (Ubuntu) in years. Fedora certainly has it.
I'm sure I've seen an article warning not to allow thin pools to fill, but I can't seem to find it now.

A quick search found this - based on that, I would suggest you post on that forum.