incorrect VG entry in the /etc/lvmtab file

[GNOM]

Hi !

There is an strange VG in my /etc/lmvtab file named /dev/
I don't now how this this volume Group has been added! I unsuccessfull tried to delete it
Then vgdisplay -v returs the following message :vgdisplay:
Volume group "/dev" does not exist in the "/etc/lvmtab" file.
vgdisplay: Cannot display volume group "/dev/".

Here are output of some commands :
server2 / >strings /etc/lvmtab
/dev/vg00
/dev/dsk/c1t2d0
/dev/dsk/c2t2d0
/dev/
/dev/dsk/c1t2d0

server2 / >vgscan -v
vgscan: Couldn't access the list of physical volumes for volume group "/dev".
vgscan: The physical volume "/dev/dsk/c1t2d0" is already recorded in the "/etc/l
vmtab" file.
vgscan: The physical volume "/dev/dsk/c2t2d0" is already recorded in the "/etc/l
vmtab" file.
Couldn't stat physical volume "/dev/dsk/c0t1d0":
Invalid argument


/dev/
/dev/dsk/c1t2d0
/dev/dsk/c2t2d0


Following Physical Volumes belong to one Volume Group.
Unable to match these Physical Volumes to a Volume Group.
Use the vgimport command to complete the process.
/dev/dsk/c4t0d0
/dev/dsk/c5t1d0

Scan of Physical Volumes Complete.
/dev/dsk/c2t2d0

NB: SAM cannot detect the volume groupe /dev/

Please help me solving this problem

[Massimo Bianchi]

try removing the corrupted /etc/lvmtab.

mv /etc/lvmtab -> /etc/lvmtab.corrupted


then issue the

vgscan -v


BEFORE doing this, apart from a valid backup, check if you have any file under /dev/ with minor "64". I remember an old bug, where a cmcluster could create such a file in /dev/ corrupting all.


HTH,
Massimo

[Patrick Wallek]

What happens if you do:

# mv /etc/lvmtab /etc/lvmtab.bad
# vgscan -a

[Bharat Katkar]

Hi,
# mv /etv/lvmtab /etc/lvmtab.old
# vgscan -a

This should help.
Regards,

[Steve Steel]

HI

solution in

http://storage.ittoolbox.com/groups/groups.asp?v=HP-UX-L&i=433433

using vgreduce -f

should be ok


Steve Steel

[GNOM]

hi !

After moving the /etc/lvmtab file and exceute the #vgscan -a command

Only this /dev/ Volume Groupe is recored in the /etc/lvmtab file

[Dietmar Konermann]

Have you really double-checked Massimo's suggestion? Watch out for weird device special files with major 64 under /dev. Check especially for the existence of "/dev/slvmvg". If it's there, remove it, move away lvmtab again and re-run vgscan. (And finally install a recent LVM commanfs patch to get this fixed.)

Best regards...
Dietmar.

[pétot stéphane]

i think it's a volume group with a name composed with special character.
Try to find the name of the vg with this script and to display its status

for i in $(ls /dev/*/group)
do
export VGNAME=$echo $i|awk -F/ '{ print "/"$2"/"$3 }')
vgdisplay $VGNAME
done

if you can see the skills of you vg it seems that my theory is okay then
replace vgdisplay by vgchange -a n

it desactivate all your vgs ( be carefull all the vgs)

if you have a normalisation for your vg name
replace the first line with a line like this

for i in $(ls /dev/*/group|grep -v VG)

VG is the normalised name you choose

[pétot stéphane]

a better script :

for i in $(ls /dev/*/group|grep -v vg.*)
do
export VGNAME=$(echo $i| awk -F/ '{ print "/"$2"/"$3 }')
vgdisplay $VGNAME > ./vg_info.txt
vgchange -a n $VGNAME
rm -R $VGNAME
echo $VGNAME
done

[Dietmar Konermann]

To be honest... it's pretty brave to post that destructive script here. It potentially removes VG directories of all VGs whose names don't start with "vg". Sorry, but this is a bad idea.

[Massimo Bianchi]

try a simple check:

cd /dev
ls -b * | more

HTH,
Massimo

[pétot stéphane]

excuse me,
i explain in the post before to replace "vg" by a synonym of the normalized name of our vg.

excuse me i m not fluent english and i forgot to repeat the instructions of the previous post .

I also forgot to specify that you must do a vgexport before doing the rm ( if you want the potential vg.

if you only want to see the name of vg you can do

ls /dev/*/group
or
ls /dev/*/group | od -c

i m really sorry for the previous post

[GNOM]

Thanks Dietmar !

It's true , there is a file named slvmvg in /dev/ directory causing this problem ; I deleted it , delete the /etc/lvmtab
And execute the vgscan command , and that's OK now !!

Thanks their Dietmar for your help !!!!