topic Re: lvm question in Operating System - HP-UX

lvm question

navin — Fri, 22 May 2009 21:06:06 GMT

how do i remove a physical disk path from lvmtab file

Re: lvm question

kemo — Fri, 22 May 2009 21:42:33 GMT

hi

check this thread, it can help ..

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1243031985423+28353475&threadId=1254676

Thanks
Kamal

Re: lvm question

Patrick Wallek — Fri, 22 May 2009 21:43:23 GMT

Remove it from the volume group.

Re: lvm question

Nido — Fri, 22 May 2009 23:59:35 GMT

Hi,

Remove the physical volume from the Volume group, move old /etc/lvmtab file to other location and run vgscan again to have new lvmtab in place.

Thanks,

Re: lvm question

Kranti Mahmud — Sat, 23 May 2009 02:23:23 GMT

Hi Navin,

Check the attached doc.

Rgds-Kranti

Re: lvm question

R.K. # — Sat, 23 May 2009 02:48:00 GMT

Hi Navin,

In order to remove only one disk from lvmtab, you can simply do:
# vgreduce vgXX /dev/dsk/cxtydz

If the disk is not responding or giving trouble, you use:
# vgreduce -f vgXX <== this will reduce missing PV from a VG

If you want to remove all the disks in a VG, that is you no longer need a VG, use following command to get rid of that VG permanently:
# vgexport vgXX

See man page of above commands for more options.

Hope this helps.

Regds,
R.K.

Re: lvm question

Taifur — Sat, 23 May 2009 03:29:35 GMT

Hi Navin,

Follow the below steps,

If lvm is created , then
#umount /mountpont
#lvremove -f /dev/vgxx/lvyy
#vgchange -a n /dev/vgxx

Remove physical volume /dev/dsk/cxtxdx from volume group /dev/vgxx:

#vgreduce /dev/vgxx /dev/dsk/cxtxdx
Force reduction of missing PVs from volume group: vg01

#vgreduce -f /dev/vgxx

After that check
#strings /etc/lvmtab

or,
Export the volume group /dev/vg01 into mapfile vg01.mymap. The volume group will be removed from the exporting system.

#vgexport -m vgxx.mymap /dev/vgxx

http://docs.hp.com/en/B3921-60631/vgreduce.1M.html

http://docs.hp.com/en/B2355-60103/vgexport.1M.html

Rgds//
Taifur

Re: lvm question

Sajjad Sahir — Sat, 23 May 2009 05:29:20 GMT

Dear Navin

Please see the link

http://docs.hp.com/en/5992-4616/ch03s01.html

thanks and regards

Sajjad Sahir

Re: lvm question

Suraj K Sankari — Sat, 23 May 2009 09:51:41 GMT

Hi,

You can use "vgexport" "vgreduce" or "sam" to remove physical disk.

Suraj

Re: lvm question

Johnson Punniyalingam — Sat, 23 May 2009 12:15:28 GMT

>>>how do i remove a physical disk path from lvmtab file<<<

# vgreduce /dev/ /dev/dsk/cxtxdx

# vgexport /dev/

# cp -pi /etc/lvmtab /etc/lvmtab.old

# mv /etc/lvmtab /etc/lvmtab.16april2006

# /usr/sbin/vgscan -v

Thanks,
Johnson

Re: lvm question

Patrick Wallek — Sat, 23 May 2009 14:37:35 GMT

Unless you have other issues, you should not need to do a vgscan after removing a disk from a VG to remove it from the /etc/lvmtab file.

That is part of the work that the LVM commands do.

The question was: "how do i remove a physical disk path from lvmtab file."

The answer is "remove the disk from the VG." To do this you use the vgreduce command. If everything else is working correctly, that is ALL you need to do.

If you have other problems, then other actions may be required, but that is not what was asked.

Re: lvm question

James R. Ferguson — Sat, 23 May 2009 14:50:38 GMT

Hi:

I second Patrick's last response. You should familarize yourself with the side-effects of running 'vgscan' to reconstruct an 'lvmtab'. Read the WARNINGS section of the manpages!

http://www.docs.hp.com/en/B2355-60130/vgscan.1M.html

As noted, if there isn't a specific need to reconstruct the 'lvmtab' then doing so only leads to more work on your part!

Regards!

...JRF...