Recovery of NAS with LVM "thick" volume

[S.Haran]

I'm working on a remote recovery of a QNAP where the data is on a LVM thick volume. With the NAS drives connected to a PC running Ubuntu Linux the RAID assembles fine via mdadm and I can see the logical volume but when I try to activate it says...

# vgchange -ay
WARNING: Unrecognised segment type thick
/usr/sbin/thin_check: execvp failed: No such file or directory
Check of pool vg1/tp1 failed (status:2). Manual repair required!
Refusing activation of LV lv1 containing an unrecognised segment.
1 logical volume(s) in volume group "vg1" now active

Researching this it appears that regular Linux does not know about thick segments. And thick provisioning is an add on created by QNAP. So I found the QNAP sources to make a Linux kernel with LVM thick support. But before I reinvent the wheel I thought I would ask if anyone has seen a similar case and may have a pre built kernel to share? Or does anyone know of a work around for recovering LVM thick volumes?

[DR-Kiev]

I'm working on a remote recovery of a QNAP where the data is on a LVM thick volume. With the NAS drives connected to a PC running Ubuntu Linux the RAID assembles fine via mdadm and I can see the logical volume but when I try to activate it says...

# vgchange -ay
WARNING: Unrecognised segment type thick
/usr/sbin/thin_check: execvp failed: No such file or directory
Check of pool vg1/tp1 failed (status:2). Manual repair required!
Refusing activation of LV lv1 containing an unrecognised segment.
1 logical volume(s) in volume group "vg1" now active

Researching this it appears that regular Linux does not know about thick segments. And thick provisioning is an add on created by QNAP. So I found the QNAP sources to make a Linux kernel with LVM thick support. But before I reinvent the wheel I thought I would ask if anyone has seen a similar case and may have a pre built kernel to share? Or does anyone know of a work around for recovering LVM thick volumes?

You should exclude culprit drive from your reconstruction.

[data-medics]

Perhaps you can just read out the RAID settings using mdadm and then assemble it in R-Studio.

[S.Haran]

@Dr-Kiev, The culprit drive was already excluded and the RAID assembles fine in degraded mode.

@data-medics, Thanks. I see R-Studio now supports LVM. But I expect it is Linux standard LVM. I don't have access right now to test it.

[DR-Kiev]

UFS , Recovery Explorer Professional
http://www.sysdevlabs.com/product.php?id=rxp6

Software changes log:

Version 6.9.3 (dated 19.01.2017):
- Download for Microsoft Windows;
- Download for Linux OS;
- Download for Apple Mac OS X;

What's new in version 6.9.3:
* Added support of LVM2 thin-provisioned volumes;
* Extended support of camera-raw formats by embedded viewer.

[S.Haran]

Thank you DR-Kiev for sharing that. I am not able to test if it also supports thick volumes. But it is nice to see an app that supports thin LVM volumes as I do not know any that do apart from the thin tools available with Linux.