[linux-lvm] vg disappeared after replacing disc in raid10

[Björn Nadrowski]

You were right,
the data has been overwritten.
It now reads thus (or rather, the first instance of human-readable volume
group description reads thus; my old volume group description is still
there, but further down...):

""""""""""""""""""""""""""""""""""""""""
vol0 {
id = "8kEHPL-yDuF-7ffg-GeGH-dEg6-D0Qn-lUrKoh"
seqno = 1
format = "lvm2" # informational
status = ["RESIZEABLE", "READ", "WRITE"]
flags = []
extent_size = 8192
max_lv = 0
max_pv = 0
metadata_copies = 0

physical_volumes {

pv0 {
id = "WFo1On-anFb-2av8-DuRq-vKee-nJEt-ZLnu26"
device = "/dev/md127"

status = ["ALLOCATABLE"]
flags = []
dev_size = 5820316928
pe_start = 384
pe_count = 710487
}
}

}
# Generated by LVM2 version 2.02.95(2) (2012-03-06): Sun Mar 24 23:39:50
2013

contents = "Text Format Volume Group"
version = 1

description = ""

creation_host = "Microknoppix"    # Linux Microknoppix 3.6.11 #12 SMP
PREEMPT Thu Dec 20 04:04:10 CET 2012 i686
creation_time = 1364168390    # Sun Mar 24 23:39:50 2013
"""""""""""""""""""""""""""""""""""""""""'''

No wonder I do not see any logical volumes (well, I did not see any logical
volumes before creating the volume neither...)

So what should I do?

lvs does not see anything, of course.

I could recreate the physical volume using

sudo pvcreate --uuid WFo1On-anFb-2av8-DuRq-vKee-nJEt-ZLnu26 --restorefile
vol0.t
xt /dev/md127

(using my old volume group description in vol0.txt, of course).

Is this what I should do? Or rather remove the physical volume first?



On Mon, Mar 25, 2013 at 9:30 PM, Stuart D Gathman <stuart at bmsi.com> wrote:

> Long ago, Nostradamus foresaw that on 03/25/2013 04:46 PM, Björn
> Nadrowski would write:
> > Recreation of the volume group seemed  a good idea as I only had one
> volume group on the pv and therefore I did not see how this could have
> destroyed anything.
> > The (human-readable) data at the beginning of the device /dev/md127 is
> still there and does display the same information. Please see my posting
> Recreating the vg overwrites the human-readable data at the beginning of
> the device.  You claim that it is "still there" and is the "same
> information".  But this cannot be true because originally that
> information had your LV data, and now (apparently) it does not.  Do you
> see your LVs when looking at the vg metadata with an editor??   What do
> you mean by "displays the same information"?  Does lvs list your LVs?
>
> _______________________________________________
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>
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