WHile importing volume groups it gave error "can not open the control file "dev/vg10/group"

[pap]

Hi,
I am migrating system disks from HP-UX 10.20 (K220) to HP-ux 11.0 (K360)

I have done following things on two volume groups in 10.20

vgexport -m /tmp/lvmconf_vg10.map -p -s -v /dev/vg10

and similarly for another vg vg20.

Then I disconnected disks and connected to new system loaded with HP-UX 11.0

I have created group file for required vgs.

NOw, when importing the volume groups I gave following command.

vgimport -m /tmp/lvmconf_vg10.map -p -v -s /dev/vg10

Then it gave following error.

vgimport : can not open the control file "/dev/vg10/group"
No such file.

I have checked the file , it is there in the /dev/vg10 directory. I have deleted the file and created again....but no luck.
Can you please let me know how do I import the volume groups now.?

Appreciated your help in advance.

Thanks,
-Piyush.

[Paula J Frazer-Campbell]

Hi

Have you done this?

mkdir /dev/vg??
mknod c 64 0x0?0000 /dev/vg??/group
vgimport -s -m mapfile.name /dev/vg??

Paula

[Krishna Prasad]

You must create the device file for the volume group as explained in the above response.

[Rita C Workman]

Well my export and import commands are just slightly different:
On first node
vgexport -pvs -m /dev/vg
rcp to mapfile to second node

On second node
vgexport /dev/vg
mkdir /dev/vg
mknod /dev/vg/group c 64 0x0_0000

vgimport -vs -m /dev/vg

Just a thought,
Rita

[Jeff Schussele]

pap,

Did you create the node:

#mknod /dev/vg10 c 64 (always for VGs) 0x00000X (must be unique)

HTH,
Jeff

[Jeff Schussele]

Oooops that should have been :

#mknod c 64 0x000001 /dev/vg10/group.

I keep telling myself "It's the syntax, stupid!" ;~)

Jeff

[Patrick Wallek]

What are the permissions on the /dev/vg?? directory and the /dev/vg??/group file?

The permissions on the group file shoud be crw------- at a minimum and it should be owned by root.

[pap]

yes I already created vg directory and group file.

Right now I have a vg10 directory and group file with 666 permission.

Still I am getting the same error.

Is it important to to vgexport using the -p option? or I should have done without -p option?

I did following while exporting vg.

vgexport -m /tmp/lvmconf_vg10.map -p -s -v /dev/vg10.
Then I copied the map file to new machine.

On new machine I have created

mkdir /dev/vg10
mknod /dev/vg10/group c 64 0x100000 /dev/vg10

now importing the volume group, I am getting the above error.
I have came across such error first time....

Thanks for your responses , though I am yet to solve my problem.

Thanks,

-Piyush.

[Helen French]

Hi Piyush,

You don't need to mention '/dev/vg10' two times while doing mknod. Try this:

# mknod /dev/vg10/group c 64 0x100000

After this check the file's major and minor numbers with ls -al command. Also make sure that the minor number is not used by any other VGs. Can you post the output of strings /etc/lvmtab ?

HTH,
Shiju

[pap]

Hi, It was a typing mistake. I specified vg10 only one time.

Still no luck.

[Darrell Allen · Accepted solution]

Hi Piyush,

The minor number you used for /dev/vg10/group 0x100000) may be too high for what you have configured as the max number of VGs on the system.

The configurable kernel parameter is maxvgs. Use sysdef to see what the max value is. You can change it with SAM or you can recreate group with a lower minor number (remember, it's in hex so the next after 0x090000 would be 0x0a0000).

Darrell

[Eric Ladner]

Check the maxvgs kernel parameter. If memory serves it defaults to 10 out of the box.

[Helen French]

Hi Piyush,

Darell's point is a good one. Check the maxvg (default 10) parameter with 'sysdef' command. Then try with a hexadecimal minor number.

# mknod /dev/vg10/group c 64 0x0a0000

HTH,
Shiju

[Sandip Ghosh]

Create the groupfile as a minor no 0x0a0000
It doesn't take as 10 , it takes as a.

Sandip

[Rita C Workman]

Pap,

If your minor number is
0x100000

then you are setting it at a value higher than your maxvgs can handle...remember 0 is a valid number..so 0-9 accounts for 10vg. Thus 0x100000 is too high.

Increase maxvgs !!

Rita

...0x0d0000 0d=13
...0x0f0000 0f=15

[pap]

Hi ,
Thanks a lot for your response.
I solved the problem. The culprit was MAx vg parameter and the minor number.....:)..

Thanks,.