topic Re: Repeated /dev/vg00/lvol3 -> /dev/root in Operating System - HP-UX

Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Fri, 12 Apr 2002 10:18:16 GMT

On 2 of our systems (HPUX 10.20), the / entry is changinf from its original mount point /dev/vg00/lvol3 to /dev/root.
The box is not booted into LVM maint. mode, and after a normal reboot de / entry is /dev/vg00/lvol3 (as it should).
Also all other items seems ok, the lvlnboot -v output seems ok, root and boot configs etc.
On random times (at least, it seems random), de entry is changed to /dev/root (als the /etc/mnttab reflects /dev/root).
When fixing the entry by removing the /etc/mnttab and issueing a mount -a, the bdf entry is back to /dev/vg00/lvol3 .. for a while at least. Withing 2 days to a week the entry is again back to /dev/root.

Anyone else had this or know what could cause it?

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Clemens van Everdingen — Fri, 12 Apr 2002 10:20:18 GMT

Hi,

As far as I recall is going to lvm maintenance mode the cause of this.

Might be single usermode as well.

C.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Fri, 12 Apr 2002 10:24:21 GMT

The systems where not booted into lvm mode, after normal reboots, the entry is correct (/dev/vg00/lvol3) for a short time (2 to 3 days mostly), then at some time it changes to /dev/root.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Clemens van Everdingen — Fri, 12 Apr 2002 10:30:40 GMT

Hi,

Forgot to mention, might also be a result of installing diagnostics.
Might be this ?

C.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Bill Hassell — Fri, 12 Apr 2002 10:40:30 GMT

/dev/root is an emergency device file when vg00 is corrupted and/or the boot record area is invalid. If /dev/root exists, there is a serious problem with vg00 definitions. Start with lvlnboot -v to see if it looks normal. If there are errors, you'll need to resolve them. See man lvlnboot, specifically option -R.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Fri, 12 Apr 2002 11:00:10 GMT

Diagnostics are installed quite a while back (Online diagnostics from the HP support bundle, B.10.20.18.13), other systems (which also have the online-diag tools do not have this problem.

The output of lvlnboot is:

# lvlnboot -v
Boot Defenitions for Volume Group /dev/vg00
/dev/dsk/c1t15d0 (10/4/4.15.0) -- Boot Disk
/dev/dsk/c2t5d0 (10/8.5.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c1t15d0
/dev/dsk/c2t5d0
Root: lvol3 on: /dev/dsk/c1t15d0
/dev/dsk/c2t5d0
Swap: lvol2 on: /dev/dsk/c1t15d0
/dev/dsk/c2t5d0
Dump: lvol2 on: /dev/dsk/c2t5d0, 0

Wich seems ok. Also.. the systems are running with the 'problem' for several month already in a production enviroment now without any problem (just ignite complains sometimes)..

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Acer_1 — Wed, 17 Apr 2002 11:59:46 GMT

I had resolved it before.
1.change the entry in /etc/mnttab:/dev/root->/dev/vg00/lvol3
2.mv /etc/lvmtab /etc/lvmtab.org
3.vgscan
4.lvlnboot -r /dev/vg00/lvol3
lvlnboot -d /dev/vg00/lvol2
lvlnboot -s /dev/vg00/lvol2
lvlnboot -b /dev/vg00/lvol1
5.reboot it's OK!

hope it helps.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Thu, 18 Apr 2002 08:11:29 GMT

Its not the point of getting it fixed 'that'easy.. remounting ( (re-)moving the mnttab, mount -a ) DOES fix it temporarily.. (back to /dev/vg00/lvol3 as it should).. the problem is that in x time, the disk switches back to /dev/root for yet unknown reason.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Clemens van Everdingen — Thu, 18 Apr 2002 08:33:48 GMT

Hi,

Did you use the solution from Joseph ?
I agree with him, it probably will stay away.

Regards,
C.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Thu, 18 Apr 2002 08:44:37 GMT

In the past year that the system has this problem, have tried many things (including editing the mnttab).. and although also this fixes it for a while.. several days later.. its back to /dev/root. The same if we reboot, or not.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Acer_1 — Thu, 18 Apr 2002 09:56:14 GMT

Hi,Nico:
I'd solved the problem using my solution.
Have you try it?I think it should work!
B.R

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Clemens van Everdingen — Thu, 18 Apr 2002 10:00:18 GMT

Nico,

Try the solution like this (Joseph's solution) !!!

1.change the entry in /etc/mnttab:/dev/root->/dev/vg00/lvol3
2.mv /etc/lvmtab /etc/lvmtab.org
3.vgscan
4.lvlnboot -r /dev/vg00/lvol3
lvlnboot -d /dev/vg00/lvol2
lvlnboot -s /dev/vg00/lvol2
lvlnboot -b /dev/vg00/lvol1
5.reboot it's OK!

C.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Thu, 18 Apr 2002 10:34:35 GMT

A system reboot will be done later this day (service levels prevent reboots during daytime operation), and we'll see if the problems also stays away. Untill now.. every attempted fix was only temporarily.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Thu, 18 Apr 2002 14:14:57 GMT

After rebooting, its currently at vg00/lvol3.. lets see if this time it stays this way.
I'll post another message to this thread if the problem yet again occurs.

(to be honest, I wouldn't be suprised if it did).

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Tue, 23 Apr 2002 05:44:56 GMT

Well.. as I suspected,
today April 23, 8.45am.. The same volume /dev/vg00/lvol3 (mounted as / ) is back to the /dev/root.

Any other solutions / idea's ?

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Clemens van Everdingen — Tue, 23 Apr 2002 06:08:10 GMT

Hi Nico,

So the problem reoccurred !

Let's see:

Do you have a mirrores situation on vg00 ?

Let's check the status of the extents on /dev/vg00/lvol1:

lvdisplay -v /dev/vg00/lvol1

Any stale extents ?

C.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Clemens van Everdingen — Tue, 23 Apr 2002 06:22:35 GMT

Hi Nico,

Are there any error/messages in syslog regarding the moment this happend ?

Pls. Post a part from there !

C.

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Tue, 23 Apr 2002 06:51:52 GMT

All (vg00) volumes logical extends are status 'current' and at 'available/syncd' and all have: Mirror copies 1

No wierd stuff in the syslog (see below, although some repeated messages have been left out..).

/var/adm/syslog :
Apr 22 17:59:03 as02a telnetd[1439]: recv: Connection timed out
Apr 22 18:40:01 as02a syslog: su : + tty?? root-p_as
Apr 22 18:40:02 as02a syslog: su : + tty?? root-oracle
Apr 22 23:30:03 as02a syslog: su : + tty?? root-p_as
Apr 23 02:00:11 as02a ftpd[4931]: connection from 10.7.2.130 [10.7.2.130]
Apr 23 02:00:11 as02a ftpd[4931]: FTP LOGIN FROM 10.7.2.130 [10.7.2.130], aojam03
Apr 23 02:00:12 as02a ftpd[4931]: aojam03 of 10.7.2.130 [10.7.2.130] deleted /as/aspkg03/as/jam/aojam03/ABOBS_200204230005_5ESS.dat
Apr 23 02:00:13 as02a ftpd[4931]: aojam03 of 10.7.2.130 [10.7.2.130] deleted /as/aspkg03/as/jam/aojam03/ABOBS_200204230005_AXE.dat
Apr 23 02:00:13 as02a ftpd[4931]: FTP session closed
Apr 23 04:05:53 as02a ftpd[18247]: connection from 10.1.72.1 [10.1.72.1]
Apr 23 04:05:53 as02a ftpd[18247]: FTP LOGIN FROM 10.1.72.1 [10.1.72.1], osgasd
Apr 23 04:06:02 as02a ftpd[18247]: FTP session closed

Apr 23 08:30:05 as02a syslog: su : + ttyp6 royen99-root
--- eof

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Ruediger Noack — Tue, 23 Apr 2002 07:03:17 GMT

Only an idea...
Do you split your mirror copy because of backup? May be this causes your problem.

Ruediger

Re: Repeated /dev/vg00/lvol3 -> /dev/root

Nico van Royen — Tue, 23 Apr 2002 07:08:17 GMT

Nop, our backup consists of just an OmniBack backup up the entire filesystem (Weekly full and rest incremental), and once in 3 months an IgniteUX dump.