[linux-lvm] recover volume group & locical volumes from PV?

"Rainer Fügenstein" rfu at oudeis.org
Sat May 11 22:52:49 UTC 2019


I am (was) using Fedora 28 installed in several LVs on /dev/sda5 (= PV),
where sda is a "big" SSD.

by accident, I attached (via SATA hot swap bay) an old harddisk
(/dev/sdc1), which was used about 2 months temporarily to move the volume
group / logical volumes from the "old" SSD to the "new" SSD (pvadd,
pvmove, ...)

this combination of old PV and new PV messed up the filesystems. when I
noticed the mistake, I did a shutdown and physically removed /dev/sdc.
this also removed VG and LVs on /dev/sda5, causing the system crash on

the layout was something like this:

/dev/sda3 ==> /boot

[root at localhost-live ~]# pvs
  PV         VG Fmt  Attr PSize   PFree
  /dev/sda5     lvm2 ---  <47.30g <47.30g

[root at localhost-live ~]# pvdisplay
  "/dev/sda5" is a new physical volume of "<47.30 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sda5
  VG Name
  PV Size               <47.30 GiB
  Allocatable           NO
  PE Size               0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               EOi5Ln-W26D-SER2-tLke-xNMP-Prgq-aUfLPz

(please note "NEW Physical Volume" ?!?!)

[root at localhost-live ~]# vgdisplay
[root at localhost-live ~]# lvdisplay

[root at localhost-live ~]# pvscan
  PV /dev/sda5                      lvm2 [<47.30 GiB]
  Total: 1 [<47.30 GiB] / in use: 0 [0   ] / in no VG: 1 [<47.30 GiB]

[root at localhost-live ~]# pvck /dev/sda5
  Found label on /dev/sda5, sector 1, type=LVM2 001
  Found text metadata area: offset=4096, size=1044480

after re-adding the old /dev/sdc1 disk, VG and LVs show up, filesystems a
bit damaged, but readable. content is about two months old.

[root at localhost-live ~]# pvs
  PV         VG              Fmt  Attr PSize    PFree
  /dev/sda5                  lvm2 ---   <47.30g <47.30g
  /dev/sdc1  fedora_sh64     lvm2 a--  <298.09g 273.30g

is there any chance to get VG and LVs back?

thanks in advance.

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