2012/11/4 Alan Feuerbacher <alanf00@comcast.net>

On 11/4/2012 2:34 PM, Alchemist wrote:

I more or less tried that on my old 32-bit system. I installed a new
disk and installed Fedora on a non-LVM partition. It could not see
the LVM partition on the older disk -- same problem as I have now.

Ok lets try

shell# pvs

you must see line /dev/sdc2 and its VG name

shell# vgscan
shell# vgchange -a y "VG name from pvs output"
shell# lvscan
here goes your ACTIVE "/dev/***" output
shell# mnt "/dev/***" /mnt/fedora32

Here's what I get doing some of that:

#################
[root@alan-fedora ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb3 vg_alan-fedora lvm2 a-- 2.73t 0

[root@alan-fedora ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "vg_alan-fedora" using metadata type lvm2

[root@alan-fedora ~]# lvscan
ACTIVE '/dev/vg_alan-fedora/lv_swap' [17.38 GiB] inherit
ACTIVE '/dev/vg_alan-fedora/lv_home' [2.66 TiB] inherit
ACTIVE '/dev/vg_alan-fedora/lv_root' [50.00 GiB] inherit
#################

I don't see a VG name for /dev/sdc2.

I'm confused about what vgchange is supposed to do. The man page does not say what it does with the line you suggested. Specifically, the command takes an INPUT volume name, and the implication is that that name will be changed, but changed to what?

Alan

That line makes volume group active. But not in this case. If both volumes are made by Anaconda and both have name "vg_alan-fedora" (as hostname) it may cause misunderstanding, for pvscanning, but as far as i know, pvs shows all VG even with same labels. Do you use Gnome? You check it with palimpsest, or all this is console releated only? Next, you can power off pc, disconnect/disable your master hdd(new), enable only old and boot from LiveCD(Fedora or any that supports LVM) and rename your old hdd VG vg_alan-fedora to f.e. vg_alan_old, so if there is a problem with naming, you now will have twoo different VG labels. Then connect/enable back your master drive, and boot as now. Then try again to pvscan. In any case be careful, do not damage your data!!!

how to rename>>>
livecd# pvs
livecd# vgscan
livecd# vgchange -a n
livecd# vgrename vg_alan-fedora vg_alan-old

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