topic Re: vg00 configuration lost in /etc/lvmtab in Operating System - HP-UX

vg00 configuration lost in /etc/lvmtab

stephen peng — Thu, 28 Sep 2006 08:17:31 GMT

dear all,
i could not query vg00's configuration using " strings /etc/lvmtab", there was no configuration in /etc/lvmtab, what could happen to vg00? how can i retrieve vg00's configuration? in this right moment, could i reboot the server? vgscan did not work. the server is a HP SD32000, and two of the four system disks might failed, but is seemed that they located in the same DS2300, so i don't think it was the disk hardware problem that produced that problem.
look forward to your reply, thanks a lot!

stephen

Re: vg00 configuration lost in /etc/lvmtab

Pete Randall — Thu, 28 Sep 2006 08:20:43 GMT

mv /etc/lvmtab /etc/lvmtab.old
vgscan -a

Pete

Re: vg00 configuration lost in /etc/lvmtab

IT_2007 — Thu, 28 Sep 2006 08:20:58 GMT

move /etc/lvmtab to /tmp/lvmtab.orig and run vgscan -av to recreate /etc/lvmtab.

rebooting server won't fix the problem. You need to identify whehter it is hardware problem or some thing else.

do you still see output of lvlnboot -v vg00 ? what it shows?

Re: vg00 configuration lost in /etc/lvmtab

stephen peng — Thu, 28 Sep 2006 09:01:13 GMT

Pete & IT 2007,
thank you for your reply.
i could not operate the system right now cause it is now near chinese national day, all the systems are not permit to operate.
from your reply, is it nessesary to move the current /etc/lvmtab to a backup file, to vgscan to recreate the /etc/lvmtab file?
there must be some hardware problem with the server, but i don't know whether it relates to this vg00 issue. furthermore, what may cause this configuration lost in the /etc/lvmtab?
thanks again.

Re: vg00 configuration lost in /etc/lvmtab

DCE — Thu, 28 Sep 2006 09:05:59 GMT

Stephen

vgscan -a does not modify an existing lvmtab file, it will only create a new one. That is why you move the original lvmtab file to new name.

potential causes - bad disk, or corrupted vg/lv.

Re: vg00 configuration lost in /etc/lvmtab

IT_2007 — Thu, 28 Sep 2006 09:06:52 GMT

could not operate the system right now cause it is now near chinese national day, all the systems are not permit to operate.
from your reply, is it nessesary to move the current /etc/lvmtab to a backup file, to vgscan to recreate the /etc/lvmtab file?
there must be some hardware problem with the server, but i don't know whether it relates to this vg00 issue. furthermore, what may cause this configuration lost in the /etc/lvmtab?
thanks again.
==========================

There are several reasons to justify about corruption.. somebody did something or messed it up. Still it is not a problem to move it and rescan it.

Re: vg00 configuration lost in /etc/lvmtab

stephen peng — Thu, 28 Sep 2006 09:12:26 GMT

dear all,
thank you for your concern,
one last problem, would the corruption of the /etc/lvmtab make the server unbootable?

Re: vg00 configuration lost in /etc/lvmtab

Yang Qin_1 — Thu, 28 Sep 2006 09:15:39 GMT

Hi, Stephen,

You can run "vgscan -p -a -v" it will not create a new lvmtab but it will report to you all your devices on the system.

BTW, to create a new lvmtab by vgscan will not impact your system.

For more information you may run a " man vgscan".

Regards,
Yang

Re: vg00 configuration lost in /etc/lvmtab

IT_2007 — Thu, 28 Sep 2006 09:18:10 GMT

one last problem, would the corruption of the /etc/lvmtab make the server unbootable?
========================

No. If lvmtab was already corrupted and you rebooted system, it will try to fix it while booting if at all there is no hardware failures otherwise it won't bootup.