vgcreate error

[Mauro Gatti]

Hi All, I get an error creating a VG:

root@devux/prdtn/dbs/dbf>vgcreate -s 8 -e 65535 vg_prdtn /dev/dsk/c7t0d0
vgcreate: Volume group "/dev/vg_prdtn" could not be created:
A volume group is already using this major and minor number.
Please check the minor number of the "group" device file.


but
root@devux/prdtn/dbs/dbf>ls -la /dev/*/group
crw-r----- 1 root sys 64 0x000000 Nov 13 2000 /dev/vg00/group
crw-r--r-- 1 root sys 64 0x010000 Jan 17 2001 /dev/vg01/group
crw-r--r-- 1 root sys 64 0x020000 Nov 22 2000 /dev/vg02/group
crw-r----- 1 root sys 64 0x030000 Dec 28 2000 /dev/vg03/group
crw-r--r-- 1 root sys 64 0x040000 Jul 3 2001 /dev/vg04/group
crw-r----- 1 root sys 64 0x100000 Jul 17 2002 /dev/vg_aste_1/group
crw-r----- 1 root sys 64 0x110000 Jul 17 2002 /dev/vg_aste_2/group
crw-r----- 1 root sys 64 0x120000 Jul 17 2002 /dev/vg_aste_3/group
crw-r----- 1 root sys 64 0x130000 Jul 17 2002 /dev/vg_aste_4/group
crw-r----- 1 root sys 64 0x140000 Jul 19 2002 /dev/vg_aste_5/group
crw-r----- 1 root sys 64 0x1a0000 Jul 13 11:11 /dev/vg_asterix/group
crw-r----- 1 root sys 64 0x060000 Jun 5 2003 /dev/vg_obelix/group
crw-r----- 1 root sys 64 0x1b0000 Jul 14 08:55 /dev/vg_prdtn/group
crw-r----- 1 root sys 64 0x070000 Jul 14 08:45 /dev/vg_prdtn_old/group
crw-r----- 1 root sys 64 0x160000 Jun 3 2003 /dev/vg_rwh/group

What am I mistaken?

Thank You

[Bharat Katkar]

HI Mauri,
Repeat this again, be sure about VG name.
1. # vgexport /dev/vg_prdtn
2. # mkdir /dev/vg_prdtn
3. # mknod /dev/vg_prdtn/group c 64 0x1b0000
4. # vgcreate -s 8 -e 65535 vg_prdtn /dev/dsk/c7t0d0

This should work.
Regards,

[Ravi_8]

Hi,

can you explain the vg creation procedure that you followed.

we normally follow this

#pvcreate -f
#mkdir /dev/
#cd /dev/
#mknod /dev//group c 64 0x0y0000
where y is vg number
#vgcreate /dev/

[Franky_1]

Hi,

you should first use

mkdir /dev/vg_prdtn
and then in that dir
mknod group c 64 0x0000
(for example vg01 - 0x010000)
This should do the trick

Franky

[Thierry Poels_1 · Accepted solution]

hi,

PHCO_29379
When more than one Volume Groups in LVM uses the same minor
number they overstep on each others data structures in the
kernel resulting in unpredictable behaviour with any of the
operations with these volume groups. This problem will not
go away even after removing both the volume groups. Any
creation of a volume group with the same minor number (after
removing all the Volume Groups using that minor number)
would fail with the following message even though there is
no volume group using that minor number at this time.


so try patching, rebooting, or another unused minor number.

regards,
Thierry.

[Mauro Gatti]

My HP-UX is 10.20 patch mentioned in this thread is for 11.11 isnt' it?

I did:
1) vgexport vg_prdtn
2) vgimport vg_prdtn with another name (vg_prdtn_old)
(I've to rename vg first because I have to migrate data)
3) mkdir /dev/vg_prdtn
4) mknod /dev/vg_prdtn/group c 64 0x1b0000
5) vgcreate new vg_prdtn

[Bharat Katkar]

Can you try with this minor no. 0x050000 or 0x080000 or 0x090000.

Regards,

[Isralyn Manalac_1]

It was because that major number and minor number is already in use as in the listing you have. Try to use another major and minor number.

[Isralyn Manalac_1]

ooops..missed out that it was actually vg_prdtn

[Thierry Poels_1]

hpux 10.20? lol
out of support since ages, I believe last patch bundles dates from december 2002

We do not support 10.20, thread closed!

now seriously:
- try other minor numbers
- try a new VG name with same minor number (if vg_prdtn_old is a renamed vg_prdtn)
- check maxvgs in your kernel, must be at least 28 to use 1B as a minor number

good luck,
Thierry