[linux-lvm] LVM2 on a USB-disk/ same VG name

[Axel Braun]

Hello experts,

I need your advice to save some data: My old laptop died, but I could make
the HD work again via a USB-adapter. I attached it to the new Laptop (as
well running SuSE 10.0 / lvm2), and the lvm on the USB-Disk is not
displayed.

The lvm on the installed system is active:
z60m:~ # pvdisplay /dev/sda8
  --- Physical volume ---
  PV Name               /dev/sda8
  VG Name               system
  PV Size               28.75 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              7359
  Free PE               11
  Allocated PE          7348
  PV UUID               ZdwaLr-anXc-Z7ck-cGI0-oFoW-UluI-F7SZ18

This group is also active:
z60m:~ # lvscan
  ACTIVE            '/dev/system/daten' [12.70 GB] inherit
  ACTIVE            '/dev/system/home' [8.00 GB] inherit
  ACTIVE            '/dev/system/root' [8.00 GB] inherit

Now, on the USB-disk is a LVM as well:
z60m:~ # pvdisplay /dev/sdb8
  --- Physical volume ---
  PV Name               /dev/sdb8
  VG Name               system
  PV Size               17.48 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              4475
  Free PE               9
  Allocated PE          4466
  PV UUID               P8KDPg-QbME-4Hzc-lw8G-ntOA-1dIv-1DeXmR

vgscan does not activate the group on the USB - due to the same name?
z60m:~ #  vgchange -a y
  3 logical volume(s) in volume group "system" now active
z60m:~ # pvscan
  PV /dev/sda8   VG system   lvm2 [28.75 GB / 44.00 MB free]
  Total: 1 [28.75 GB] / in use: 1 [28.75 GB] / in no VG: 0 [0   ]
z60m:~ # lvscan
  ACTIVE            '/dev/system/daten' [12.70 GB] inherit
  ACTIVE            '/dev/system/home' [8.00 GB] inherit
  ACTIVE            '/dev/system/root' [8.00 GB] inherit

What is your proposal to activate the USB-lvm group - best without loosing
data.....

TIA
Axel

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