Problem with pve-data: It doesn´t show its content

Marcos Ortiz

New Member
Nov 24, 2017
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Greeting to all Proxmox´s community.
I have a tricky problem here with one of our proxmox servers. We had installed in this server the version 3.1, but it seems that for a problem with the disc, the Operating system failed and we had to reinstalled the server, now with the version 5.1.
The problem is that now, pve-data doesn´t show its content. We tried to add the LVM volumen using the Proxmox GUI on the website, but it doesn´t show anything inside, but when we select the volumen, it shows that there is used space: almost 87% actually.
So, we believe that the data is present there.
This is the outputs of pvscan, pvdisplay, lvdisplay, vgdisplay and lvscan:
1. pvscan
Code:
pvscan
PV /dev/sdb1   VG Almacen         lvm2 [74.53 GiB / 74.53 GiB free]
  PV /dev/sda3   VG pve             lvm2 [74.28 GiB / 9.16 GiB free]
  Total: 2 [148.80 GiB] / in use: 2 [148.80 GiB] / in no VG: 0 [0   ]

2. pvdisplay
Code:
--- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               Almacen
  PV Size               74.53 GiB / not usable 0
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              19079
  Free PE               19079
  Allocated PE          0
  PV UUID               Qu2pKn-EAk3-0bJs-ZsuJ-VS7I-ye13-yn60cB

  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               pve
  PV Size               74.28 GiB / not usable 1.07 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              19015
  Free PE               2345
  Allocated PE          16670
  PV UUID               tbynAt-ToCg-ubkd-1Q0W-3pDc-Xcdi-P7wlAV

3. lvdisplay
Code:
  --- Logical volume ---
  LV Path                /dev/pve/swap
  LV Name                swap
  VG Name                pve
  LV UUID                6msMgV-ckpQ-zC0t-XnXC-3GAV-0t7e-VQbUvN
  LV Write Access        read/write
  LV Creation host, time proxmox, 2017-11-22 20:42:38 -0500
  LV Status              available
  # open                 2
  LV Size                4.00 GiB
  Current LE             1024
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/pve/root
  LV Name                root
  VG Name                pve
  LV UUID                fEu36n-xxon-L7Ly-mnjf-ckmj-p77P-WWXJh1
  LV Write Access        read/write
  LV Creation host, time proxmox, 2017-11-22 20:42:39 -0500
  LV Status              available
  # open                 1
  LV Size                18.50 GiB
  Current LE             4736
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Name                data
  VG Name                pve
  LV UUID                M0e7WV-KvsK-hQ29-eqlM-GYDP-4tZe-XBDXWy
  LV Write Access        read/write
  LV Creation host, time proxmox, 2017-11-22 20:42:39 -0500
  LV Pool metadata       data_tmeta
  LV Pool data           data_tdata
  LV Status              available
  # open                 0
  LV Size                42.53 GiB
  Allocated pool data    0.00%
  Allocated metadata     0.45%
  Current LE             10888
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:4

4. vgdisplay
Code:
--- Volume group ---
  VG Name               Almacen
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               74.53 GiB
  PE Size               4.00 MiB
  Total PE              19079
  Alloc PE / Size       0 / 0
  Free  PE / Size       19079 / 74.53 GiB
  VG UUID               DLrBwQ-9YC5-kHCV-3JR3-TNeQ-Ryof-RGA0q6

  --- Volume group ---
  VG Name               pve
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               74.28 GiB
  PE Size               4.00 MiB
  Total PE              19015
  Alloc PE / Size       16670 / 65.12 GiB
  Free  PE / Size       2345 / 9.16 GiB
  VG UUID               2ByWDe-CDJv-cU8o-KGZa-aka6-L0bg-CQwyaP

5. lvscan
Code:
ACTIVE            '/dev/pve/swap' [4.00 GiB] inherit
ACTIVE            '/dev/pve/root' [18.50 GiB] inherit
ACTIVE            '/dev/pve/data' [42.53 GiB] inherit

0 logical volume(s) in volume group "Almacen" now active
  3 logical volume(s) in volume group "pve" now active

We tried to see what´s happen inside /dev/mapper too with this:
Code:
root@proxmox2:/mnt# ls -al /dev/mapper/
total 0
drwxr-xr-x  2 root root     160 Nov 24 08:45 .
drwxr-xr-x 21 root root    4540 Nov 24 10:41 ..
crw-------  1 root root 10, 236 Nov 24 08:45 control
lrwxrwxrwx  1 root root       7 Nov 24 08:45 pve-data -> ../dm-4
lrwxrwxrwx  1 root root       7 Nov 24 08:45 pve-data_tdata -> ../dm-3
lrwxrwxrwx  1 root root       7 Nov 24 08:45 pve-data_tmeta -> ../dm-2
lrwxrwxrwx  1 root root       7 Nov 24 08:45 pve-root -> ../dm-1
lrwxrwxrwx  1 root root       7 Nov 24 08:45 pve-swap -> ../dm-0

Any suggestion or recommendation is more than welcome. Thanks
 
lvs shows the output in a condensed format

but your lvdisplay already shows the content:
LV Size 42.53 GiB
Allocated pool data 0.00%
Allocated metadata 0.45%

so there is no data in the data lv

I have a tricky problem here with one of our proxmox servers. We had installed in this server the version 3.1, but it seems that for a problem with the disc, the Operating system failed and we had to reinstalled the server, now with the version 5.1.
did you just install over the already existing installation ? if yes, the data on the selected disk is gone, and you should restore from backup