topic Re: VG exclusive mounted in 2 nodes in Operating System - HP-UX

VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 05:53:36 GMT

Hello All,

I have a very stange problem here.

There is a storage migration work and I have to do vgexport and vgimport to the cluster nodes. While I am doing this is a one of the first node(node1) I selected, I do see an error.

This is a Package VG is having only one disk with an alternate path in it.

I could not see the alternate path in the node1 and when I try to deactivate the VG that is mounted in the readonly mode it is giving the following error.

(In Node1)
# vgchange -a n /dev/vg001
vgchange: Warning: couldn't query physical volume "/dev/dsk/c55t13d1":
The specified path does not correspond to physical volume attached to
this volume group
vgchange: Warning: couldn't query all of the physical volumes.
vgchange: Failed to notify clvm daemon about volume group deactivation - No such file or directory
Couldn't deactivate volume group "/dev/vg001":
No such file or directory

Now when I see vgdisplay for that VG , now it is showing as exclusive and read/write.
Does this seems to be a strange one...:-) !!!!

Any help please....

Thanks in advance.

Re: VG exclusive mounted in 2 nodes

Aneesh Mohan — Mon, 01 Oct 2007 05:59:15 GMT

Hi ,

> # vgchange -a n /dev/vg001

is it vg01 or vg001 ?

Aneesh

Re: VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 06:04:01 GMT

Hi Aneesh,

This is vg001 only.

I have already given the vgchange -a n vg001 error message.

Thanks..

Re: VG exclusive mounted in 2 nodes

Aneesh Mohan — Mon, 01 Oct 2007 06:12:51 GMT

Please issue vgsync /dev/vg001 before doing vgchange .

Aneesh

Re: VG exclusive mounted in 2 nodes

J. Bravo — Mon, 01 Oct 2007 06:20:28 GMT

Hello:

Please, attach us the output of:

cmviewcl -v
vgdisplay -v vg001, in both nodes
strings /etc/lvmtab
ll /dev/vg001

Regards;

J. Bravo.

Re: VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 07:20:33 GMT

Hi Aneesh,

I am afraid if I do vgsync in the node1 will it affect the same cluster VG that is active in exclusive mode in the node4 (where the package is currently running).

Node_Switching_Parameters:
NODE_TYPE STATUS SWITCHING NAME
Primary up enabled node001
Alternate up enabled node004 (current)
Alternate up enabled node002
Alternate up enabled node003

Re: VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 07:21:08 GMT

Hi Aneesh,

I am afraid if I do vgsync in the node1 will it affect the same cluster VG that is active in exclusive mode in the node4 (where the package is currently running).

Node_Switching_Parameters:
NODE_TYPE STATUS SWITCHING NAME
Primary up enabled node1
Alternate up enabled node4 (current)
Alternate up enabled node2
Alternate up enabled node3

Re: VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 07:28:32 GMT

Hi Bravo,

Pls. see the attachment..

Thanks.

Re: VG exclusive mounted in 2 nodes

J. Bravo — Mon, 01 Oct 2007 08:02:47 GMT

Hi!

It seems to be that your alterante link is missing. Do you have tried to execute "ioscan -fnC disk"? Please, after execute the ioscan, run dmesg to view possible errors over the disk.

Regards;

J. Bravo.

Re: VG exclusive mounted in 2 nodes

Steven E. Protter — Mon, 01 Oct 2007 08:36:54 GMT

Shalom,

The simple solution would be to insure only one node has access to the shared storage and do:

vgreduce -f vg001

Then follow the instructions that come along after that.

The thing I've always liked about HP-UX LVM is that when you mount in exclusive mode, the second node is denied the ability to mount, versus LVM Linux which merrily lets two nodes mount the same volume group exclusive without even a peep.

SEP

Re: VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 10:22:10 GMT

Hi

#vgreduce /dev/vg001 /dev/dsk/c55t13d1
vgreduce: Couldn't query physical volume "/dev/dsk/c55t13d1":
The specified path does not correspond to physical volume attached to
this volume group
--------

#vgreduce -f /dev/vg001 - does not give any errors but no improvements... :(

ioscan /diskinfo - shows claim /OK status for this disk.

dmesg - not much information about this.

But,
# pvdisplay /dev/dsk/c55t13d1
pvdisplay: Warning: couldn't query physical volume "/dev/dsk/c55t13d1":
The specified path does not correspond to physical volume attached to
this volume group
pvdisplay: Warning: couldn't query all of the physical volumes.
pvdisplay: Couldn't retrieve the names of the physical volumes
belonging to volume group "/dev/vg001".
pvdisplay: Cannot display physical volume "/dev/dsk/c55t13d1".

Hope this information helps to help me.

Re: VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 10:25:17 GMT

Backround info.

This VG is mounted in Readonly but due to unknown reason it turned read/write now in the other node (node1).

This is the strange part of the problem.

Re: VG exclusive mounted in 2 nodes

J. Bravo — Mon, 01 Oct 2007 10:43:11 GMT

Hi:

Try with "vgreduce -l vg001 /dev/dsk/c55t13d1" and "vgextend vg001 /dev/dsk/c55t13d1"

Regards;

J. Bravo.

Re: VG exclusive mounted in 2 nodes

Karuppiah Ganesan — Mon, 01 Oct 2007 11:11:51 GMT

Hi Bravo,

vgreduce - worked sucessfully removed the affected PV link from lvmtab.
Thanks

Now I want to deactivate the vg - vg001

# vgchange -a n /dev/vg001
vgchange: Failed to notify clvm daemon about volume group deactivation - No such file or directory
Couldn't deactivate volume group "/dev/vg001":
No such file or directory

As this vg is cluster aware it is not allowiing me to deactivate.
Is it recomended to run "vgchange -c n vg001" while the package is up and running in the other node.

Please suggest..

Thanks.