topic Re: Vgdisplay error in Operating System - HP-UX

Vgdisplay error

Nagashankar — Wed, 18 Aug 2004 00:37:45 GMT

When i do a vgdisplay -v vg01, i get the following error..vgdisplay: Cannot open the control file "/dev/vg01/group":No such devicevgdisplay: Cannot display volume group "vg01"The only change that was done was a restart.This is new system and very less chances of a disk failure.Because of this i am not able to mount one of the filesystem located in vg01.the filesystem on vg01 was hfs..Kindly can someone let me know what can done.

Re: Vgdisplay error

Bharat Katkar — Wed, 18 Aug 2004 01:01:39 GMT

Hi,

1. Check whether /dev/vg01/group exists and that the minor no. is correct. Check the timestamp for any recent modifications.
2. do # strings lvmtab
See whether it show vg01 and associated PV's
If it doesn't show then you have to do
-- mv /etc/lvmtab to /etc/lvmtab.org
-- vgscan -a
Rebuilds lvmtab file.

Hope that helps.
Regards,

Re: Vgdisplay error

Nagashankar — Wed, 18 Aug 2004 01:12:33 GMT

Thanks for the reply.The below given is my old lvmtab entry.The Disk c2t0d0 is present.root@spec# strings /etc/lvmtab.org/dev/vg00=TrS@/dev/dsk/c2t1d0s2/dev/vg01=TrSA/dev/dsk/c2t0d0The output of vgscan is as followsUnable to match these Physical Volumes to a Volume Group.Use the vgimport command to complete the process./dev/dsk/c2t0d0The Volume Group /dev/vg01 was not matched with any Physical Volumes.I tried Vgimport it gives the following error.vgimport -v /dev/vg01Beginning the import process on Volume Group "/dev/vg01".vgimport: Cannot open the control file "/dev/vg01/group":No such device

Re: Vgdisplay error

Muthukumar_5 — Wed, 18 Aug 2004 01:52:53 GMT

I hope the /etc/lvmtab file is not updated.

Check us,

vgscan -pv

It will give the scan report to you with out updation.

Try to back up the /etc/lvmtab to another location.

Are you have the localtion of directory as,

/dev/vg01/?

Else copy /dev/vg00/ to /dev/vg01/

Then check as like,

vgimport -pv /dev/vg01

Update the lvmtab file. It will not prompt
vgdisplay: Cannot open the control file "/dev/vg01/group":No such devicevgdisplay:

Try as -pv for every action before doing it.

Re: Vgdisplay error

Muthukumar_5 — Wed, 18 Aug 2004 01:55:06 GMT

Oops.. Try to create vg with vgcreate to create vg01 volume group.

see more on vgcreate man page

Re: Vgdisplay error

monasingh_1 — Wed, 18 Aug 2004 01:56:58 GMT

Do you have /dev/vg01/group file to begin with?
you may want to check that.
if not present , recretaethat wit mknod command...

Re: Vgdisplay error

Massimo Bianchi — Wed, 18 Aug 2004 01:57:52 GMT

Hi,
please check previous number 1 item, it's very likel that the /dev/vg01/group file is missing.

TO check if it has been deleted, try this:

cd /dev/vg01
strings .| more

if the file was there, you will find a trace.

YOu probably have to re-import the VG.

BTW, wht's in your /etc/lvmtab ?

HTH,
Massimo

Re: Vgdisplay error

Massimo Bianchi — Wed, 18 Aug 2004 01:58:59 GMT

Hi,
another little thing: are you using and EVA ?

In that case, at boot disks are not visible, due to a missing workaround.

Try issuing a couple of IOSCAN

ioscan -fn

and then look if you have the disks.

Regards,
Massimo

Re: Vgdisplay error

Matti_Kurkela — Wed, 18 Aug 2004 02:55:37 GMT

Things to check:

- Does the directory /dev/vg01 exist?

- Like the error message says, does the control file /dev/vg01/group exist?

- Run a command: "strings /etc/lvmtab". There you should find the device name(s) where the system expects to find the vg01. Does that look correct? Are those disks visible in "ioscan -fnCdisk"?

What kind of disk(s) the vg01 is located on? Internal disk in the server? External SCSI? External FibreChannel storage box? A large FibreChannel SAN fabric? Something else?

Re: Vgdisplay error

Dietmar Konermann — Wed, 18 Aug 2004 04:27:49 GMT

If I recall it correctly, then vgdisplay says:

Cannot open the control file "/dev/vg01/group":
No such device

This has nothing to do with lvmtab and typically means:
- /dev/vg01/group is present
- /dev/vg01/group is a character special file
- /dev/vg01/group has major 64

But:
The VG number NN (minor 0xNNxxxx) may not be in the range 0...maxvgs-1.

So please check the minor number and compare it with your maxvgs kernel tunable.

Best regards...
Dietmar.

Re: Vgdisplay error

Nagashankar — Wed, 18 Aug 2004 09:21:44 GMT

That was perfect,The minor (0xNNxxxx) was somehow wrong, just relialised it late.i have corrected the same to solve the problem, thanks for all those who replied.