Mount on Ubuntu - unknown filesystem type 'LVM2_member'

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jonathan56DE
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Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by jonathan56DE »

Hello,

My QNAP TS228A does not start anymore, while I send it to the costumer support I want to access my HDD.

I tried to mount them with "Parted Magic" distribution. But I got an error because of the file system is "lvm2 pv" and I need a software package.
Screenshot 2019-03-22 at 13.21.15.jpg
I tried on Ubuntu:
sudo fdisk -l
Screenshot 2019-03-22 at 13.26.24.jpg
I did:
sudo mdadn --assemble --run /dev/md0 /dev/sdc3
mdadm: /dev/md0 has been started with 1 drive

sudo mount /dev/md0 media/new/
mount: /media/new: unknown filesystem type 'LVM2_member'

sudo mdadm --examine /dev/sdc3
Screenshot 2019-03-22 at 13.32.04.jpg
I tried to force ext3 or ext4 without success ("mount -t", I read this online)

There has to be a way to recover my data from my HDD right? I look online but all my attempt have failed.

Thanks for helping me.
Regards,
Jonathan
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Don
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by Don »

This has been attempted and reported on before. Please search the forum.
Use the forum search feature before posting.

Use RAID and external backups. RAID will protect you from disk failure, keep your system running, and data accessible while the disk is replaced, and the RAID rebuilt. Backups will allow you to recover data that is lost or corrupted, or from system failure. One does not replace the other.

NAS: TVS-882BR | F/W: 5.0.1.2346 | 40GB | 2 x 1TB M.2 SATA RAID 1 (System/VMs) | 3 x 1TB M.2 NMVe QM2-4P-384A RAID 5 (cache) | 5 x 14TB Exos HDD RAID 6 (Data) | 1 x Blu-ray
NAS: TVS-h674 | F/W: 5.0.1.2376 | 16GB | 3 x 18TB RAID 5
Apps: DNSMasq, PLEX, iDrive, QVPN, QLMS, MP3fs, HBS3, Entware, DLstation, VS, +
jonathan56DE
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by jonathan56DE »

Hi Thanks for your quick feedback.

I had a look at the forum prior to my post. I am everytime having the problem with "lvm2_member" which I do not know if this is a new things on QNAP.
Details of what does not work from the suggestion on this forum:

The answer from Guki49
viewtopic.php?f=22&t=143173&p=697333&hi ... er#p697333
which refer to this method:
http://blog.marcelbrouwers.nl/2016/04/2 ... on-ubuntu/

Fail with my disk.

First, when I try this:
mdadm -A -R /dev/md9 /dev/sdc3
I got that the /sd3 is busy - skipping

With "sudo mdadm --detail /dev/md*" I figure it out that it is indeed already "active sync" on md125.

I stop it with "sudo mdadm --stop /dev/md125"
then run "sudo mdadm -A -R /dev/md9 /dev/sdc3" which work. But same problem when I do "sudo mount /dev/md9 /mnt"
I got " mount: /mnt: unknown filesystem type 'LVM2_member"

(I did run "sudo apt-get install lvm2" but it was already included on my ubuntu)

I may have missed another thread. But I do not find anything else.

Thanks,
Regards,
Jonathan
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dolbyman
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by dolbyman »

verdict of all those threads was: restore to a new QNAP unit and make sure you have external backups from then on (as external backups can be read in any device)
jonathan56DE
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by jonathan56DE »

Ok. Thanks for your feedback.
I am disappointed about QNAP, not only because my NAS break after 3 months of usage. But also because you cannot recover data from the HDD. I wonder if this is the same with Synology? But anyway, now I am stuck with QNAP to recover my data which is also a scandal. The full point of buying a NAS for my home was to have a nice backup solution with two drives. And now I am stuck with two healthy drives and no way to read them!
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dolbyman
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by dolbyman »

if the NAS was a backup, then the original data must be still there, if the the data is not on the original source anymore, then the NAS was NOT a backup but the PRIMARY storage and in that case you need to backup the NAS (RAID is NOT a backup)
nebula83
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by nebula83 »

Since I stumbled upon this after a google search, I tried the same steps:


$ sudo mount /dev/sdb5 nas/
mount: nas: unknown filesystem type 'linux_raid_member'.



$ sudo mdadm --assemble --readonly /dev/md0 /dev/sdb5
mdadm: /dev/sdb5 is busy - skipping



$ sudo mdadm --examine --scan --verbose
ARRAY /dev/md/0 level=raid1 metadata=1.2 num-devices=2 UUID=f73cee1d:d9d24d2b:c5cc1620:26c3af1b name=E091F58B291E:0
devices=/dev/sdb1
ARRAY /dev/md/1 level=raid5 metadata=1.2 num-devices=2 UUID=8a697f22:89075a10:dd747042:670355c6 name=E091F58B291E:1
devices=/dev/sdb2
ARRAY /dev/md/2 level=raid5 metadata=1.2 num-devices=2 UUID=f53416db:4e77de17:f9cdbe1d:ec8f1d0a name=E091F58B291E:2
devices=/dev/sdb5



$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md126 : inactive sdb5[0](S)
1948792380 blocks super 1.2

md125 : inactive sdb2[0](S)
524224 blocks super 1.2

md127 : inactive sdb1[0](S)
4193280 blocks super 1.2

unused devices: <none>



$ mdadm --stop /dev/md126



$ sudo mdadm --assemble --readonly --run /dev/md/2 /dev/sdb5



$ sudo mount /dev/md/2 nas
mount: /home/nebula/nas: unknown filesystem type 'LVM2_member'.



$ sudo lvdisplay
--- Logical volume ---
LV Path /dev/c/c
LV Name c
VG Name c
LV UUID m3oool-AOaK-s0CV-Adab-EAII-eAKW-QANjLX
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 0
LV Size 1.81 TiB
Current LE 29656
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0



$ sudo mount /dev/c/c nas


An I got myself a mounted disk. k thanks bye.
syncthing
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by syncthing »

just before OneCD will lock the thread, an useful link

viewtopic.php?f=25&t=159692
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OneCD
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Re: Mount on Ubuntu - unknown filesystem type 'LVM2_member'

Post by OneCD »

syncthing wrote: Thu May 06, 2021 3:37 am just before OneCD will lock the thread, an useful link

viewtopic.php?f=25&t=159692
:DD You just made it.

* topic locked to prevent further necroposting *

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