[SOLVED] How to access partitions via Ubuntu?

P

Penecho

New Member
Apr 30, 2022
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Hi guys,

I ran into a small issue with my Proxmox Installation. As of late we had a couple of power outtages and the latest seems to have killed /dev/mapper/pve-root, at least I get that error upon bootup: unexpected inconsistency run fsck manually.

After reading and googling and trying for 4-5 hours I ran out of ideas and booted from a Ubuntu Live-CD because I thought at least I can try and pull some data off of it.
What I tried before starting the LiveCD: I did try to run fsck of course (without success) and also tried to restore the superblocks (got the list of Backup blocks via "mke2fs -n /dev/mapper/pve-root") via the backup superblocks (e2fsck -b block_number /dev/mapper/pve-root) but that also never worked (unable to set superblock flags). I tried with all the backup blocks available.


So I fired up a Ubuntu live CD on a USB stick on the same machine and I am trying to mount the "partition"(?) with my data in it...

It's just a small setup with 1 SSD and 3 VM's setup (2x Win10, 1x Ubuntu). So nothing special/fancy.


I am a complete linux noob, so bare with me, I tried a couple of things, maybe anyone spots anything!?

sudo mount /dev/mapper/pve-vm--102--disk--0 /media/recover
Code: 
mount: /media/recover: Falscher Dateisystemtyp, ungültige Optionen, der Superblock von /dev/mapper/pve-vm--102--disk--0 ist beschädigt, fehlende Kodierungsseite oder ein anderer Fehler.

Same result with "sudo mount -t ntfs" and "sudo mount -t ntfs-3g"


sudo lsblk -o NAME,FSTYPE,LABEL,SIZE,MOUNTPOINT
Code: 
NAME                         FSTYPE      LABEL         SIZE MOUNTPOINT
loop0                        squashfs                  2,3G /rofs
loop1                        squashfs                    4K /snap/bare/5
loop2                        squashfs                150,4M /snap/firefox/631
loop3                        squashfs                 65,2M /snap/gtk-common-themes/1519
loop4                        squashfs                 61,8M /snap/core20/1169
loop5                        squashfs                 54,2M /snap/snap-store/557
loop6                        squashfs                 99,3M /snap/core/11743
loop7                        squashfs                242,3M /snap/gnome-3-38-2004/76
sda                                                   29,3G
└─sda1                       vfat        UBUNTU 21_1  29,3G /cdrom
nvme0n1                                              931,5G
├─nvme0n1p1                                           1007K
├─nvme0n1p2                  vfat                      512M
└─nvme0n1p3                  LVM2_member               931G
  ├─pve-swap                 swap                        8G
  ├─pve-root                                            96G
  ├─pve-data_tmeta                                     8,1G
  │ └─pve-data-tpool                                 794,8G
  │   ├─pve-data                                     794,8G
  │   ├─pve-vm--100--disk--0                            92G
  │   ├─pve-vm--101--disk--0                            64G
  │   └─pve-vm--102--disk--0                           500G
  └─pve-data_tdata                                   794,8G
    └─pve-data-tpool                                 794,8G
      ├─pve-data                                     794,8G
      ├─pve-vm--100--disk--0                            92G
      ├─pve-vm--101--disk--0                            64G
      └─pve-vm--102--disk--0                           500G


sudo lvdisplay
Code: 
  --- Logical volume ---
  LV Path                /dev/pve/swap
  LV Name                swap
  VG Name                pve
  LV UUID                TELIXQ-MmmY-pc87-uvaP-4CKp-sXpK-8CISbr
  LV Write Access        read/write
  LV Creation host, time proxmox, 2021-10-18 18:45:18 +0000
  LV Status              available
  # open                 0
  LV Size                8,00 GiB
  Current LE             2048
  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                G75BW0-Q1jQ-m4L0-Lxiu-RaTd-SJ00-mR6Q7B
  LV Write Access        read/write
  LV Creation host, time proxmox, 2021-10-18 18:45:18 +0000
  LV Status              available
  # open                 0
  LV Size                96,00 GiB
  Current LE             24576
  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                CDcbG1-BDQK-JdK8-mIdr-ntO3-eoAQ-UQzAXR
  LV Write Access        read/write (activated read only)
  LV Creation host, time proxmox, 2021-10-18 18:45:21 +0000
  LV Pool metadata       data_tmeta
  LV Pool data           data_tdata
  LV Status              available
  # open                 0
  LV Size                <794,79 GiB
  Allocated pool data    50,31%
  Allocated metadata     2,58%
  Current LE             203466
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:5
 
  --- Logical volume ---
  LV Path                /dev/pve/vm-100-disk-0
  LV Name                vm-100-disk-0
  VG Name                pve
  LV UUID                Fm2ChF-fwcj-ue2e-WkSx-sAJn-hQ3j-EAfw5u
  LV Write Access        read/write
  LV Creation host, time pve, 2021-10-18 19:02:55 +0000
  LV Pool name           data
  LV Status              available
  # open                 0
  LV Size                92,00 GiB
  Mapped size            66,76%
  Current LE             23552
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:6
 
  --- Logical volume ---
  LV Path                /dev/pve/vm-101-disk-0
  LV Name                vm-101-disk-0
  VG Name                pve
  LV UUID                tLCHas-bZFP-HSeB-UwP2-lbLS-24NH-f5XQpo
  LV Write Access        read/write
  LV Creation host, time pve, 2021-10-19 13:01:07 +0000
  LV Pool name           data
  LV Status              available
  # open                 0
  LV Size                64,00 GiB
  Mapped size            16,83%
  Current LE             16384
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:7
 
  --- Logical volume ---
  LV Path                /dev/pve/vm-102-disk-0
  LV Name                vm-102-disk-0
  VG Name                pve
  LV UUID                N1jvSq-rpne-vtvL-oQ0B-buGl-CWwU-B9nUDa
  LV Write Access        read/write
  LV Creation host, time pve, 2021-10-19 14:59:51 +0000
  LV Pool name           data
  LV Status              available
  # open                 0
  LV Size                500,00 GiB
  Mapped size            65,53%
  Current LE             128000
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:8


sudo lvscan
Code: 
ACTIVE            '/dev/pve/swap' [8,00 GiB] inherit
ACTIVE            '/dev/pve/root' [96,00 GiB] inherit
ACTIVE            '/dev/pve/data' [<794,79 GiB] inherit
ACTIVE            '/dev/pve/vm-100-disk-0' [92,00 GiB] inherit
ACTIVE            '/dev/pve/vm-101-disk-0' [64,00 GiB] inherit
ACTIVE            '/dev/pve/vm-102-disk-0' [500,00 GiB] inherit

sudo ls -l /dev/mapper/
Code: 
crw------- 1 root root 10, 236 Apr 29 19:45 control
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-data -> ../dm-5
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-data_tdata -> ../dm-3
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-data_tmeta -> ../dm-2
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-data-tpool -> ../dm-4
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-root -> ../dm-1
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-swap -> ../dm-0
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-vm--100--disk--0 -> ../dm-6
lrwxrwxrwx 1 root root       7 Apr 29 19:46 pve-vm--101--disk--0 -> ../dm-7
lrwxrwxrwx 1 root root       7 Apr 29 21:30 pve-vm--102--disk--0 -> ../dm-8


sudo fuseext2 -o ro -o allow_other /dev/pve/pve-vm-102-disk-0 /mnt/recover
Code: 
fuse-umfuse-ext2: version:'0.4', fuse_version:'29' [main (fuse-ext2.c:331)]
fuse-umfuse-ext2: Failed to access '/dev/pve/pve-vm-102-disk-0' [main (fuse-ext2.c:341)]

sudo dmesg
Code: 
[ 6275.641857] blk_update_request: critical medium error, dev nvme0n1, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 0
[ 7311.164666] exFAT-fs (dm-8): invalid fs_name
[ 7311.164672] exFAT-fs (dm-8): failed to read boot sector
[ 7311.164673] exFAT-fs (dm-8): failed to recognize exfat type
[ 7598.860819] exFAT-fs (dm-8): invalid fs_name
[ 7598.860824] exFAT-fs (dm-8): failed to read boot sector
[ 7598.860826] exFAT-fs (dm-8): failed to recognize exfat type



Does anyone have a clue how I could get to the data? Or what would be the best approach here?
 
Last edited:
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