topic Re: /dev/root in Operating System - HP-UX

/dev/root

Darren Murray_1 — Thu, 25 Nov 2004 03:55:48 GMT

I have a hp workstation system which is mounting / as /dev/root instead of /dev/vgroot/root.

I have tried copying /etc/mnttab to /etc/mnttab.orig and then doing a mount -a and bdf but it still shows as /dev/root.

It is still showing this as /dev/root even when not in maintenance mode.

Any ideas?

Re: /dev/root

Sunil Sharma_1 — Thu, 25 Nov 2004 04:02:15 GMT

what version of HP UX is running there ?

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 04:04:02 GMT

its running 10.20

Re: /dev/root

Robert-Jan Goossens — Thu, 25 Nov 2004 04:05:40 GMT

Hi Darren,

If it is possible, reboot your workstation.

Regards,
Robert-Jan

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 04:07:51 GMT

have done that already..still the same

any other ideas

Re: /dev/root

Sridhar Bhaskarla — Thu, 25 Nov 2004 04:12:48 GMT

Hi Darren,

If there is a problem with the disk associated with / filesystem, /dev/root gets mounted. It could also happen if there are any incorrect or corrupted entries in /etc/fstab. Try the commands 'lvlnboot -v', 'vgdisplay -v', 'pvdisplay -v ' 'lvdisplay -v ' etc., to see if there is anything abnormal.

-Sri

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 04:22:14 GMT

Have checked the /etc/fstab file and its correct. All vgdisplay, lvdisplay , pvdisplay outputs are correct.

Re: /dev/root

Robert-Jan Goossens — Thu, 25 Nov 2004 04:25:18 GMT

Could you post your /etc/fstab ?

Re: /dev/root

Ivajlo Yanakiev — Thu, 25 Nov 2004 04:26:10 GMT

It can be all disk partition

send as /etc/fstab
also
vgdisplay -v

try and sent as :
lssf /dev/root

Re: /dev/root

Sridhar Bhaskarla — Thu, 25 Nov 2004 04:28:03 GMT

Any errors on 'mount -a' command?. Any errors on the console during the boot time?. In /etc/rc.log?. Any 'stale' entries in your 'lvdisplay' or 'vgdisplay'?.

-Sri

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 04:36:27 GMT

No errors occur when the server boots.
The lvdisplay shows no stale extents.
Checked rc.log and there are no errors in there either.

If I boot the machine into single user mode i get sh errors when trying to execute any command. If I boot the machine into maintenance mode and then do a vgchange -a y /dev/vgroot and do a mount -a I can then execute commands.

Re: /dev/root

Sridhar Bhaskarla — Thu, 25 Nov 2004 04:38:56 GMT

Hmmm 'sh errors'?. Can you post the exact messages you are getting?. If you booted the system first into maintenance mode and then into multi-user, then you cannot get rid of /dev/root until you reboot it normally.

-Sri

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 04:40:35 GMT

the fstab looks like this

/dev/vgroot/root / hfs defaults 0 1
/dev/vgroot/usr /usr hfs defaults 0 2
/dev/vgroot/opt /opt hfs defaults 0 2
/dev/vgroot/home /home hfs defaults 0 2
/dev/vgroot/var /var hfs defaults 0 2

Re: /dev/root

Sridhar Bhaskarla — Thu, 25 Nov 2004 04:44:56 GMT

Hi,

Don't you have a /stand filesystem?. What do you have your 'boot' volume defined as?. 'lvlnboot -v'.

I see the non-default names for the vg00 LVs like (root, usr etc.,). I actually like it and configure them on my systems too. But during the reconfiguration there is a good chance that we may miss to rename some lvols and that can make /etc/fstab to go stale.

?? any clues there?

-Sri

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 04:52:35 GMT

There is no /stand file system but thats standard for the workstation and its age Im pretty sure.

Re: /dev/root

Robert-Jan Goossens — Thu, 25 Nov 2004 04:53:32 GMT

Darren,

Take a look at this doc.

http://www5.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000073839205

Document description: Migrating Root Volume Group to new disk(s).
Document id: LVMKBRC00007285

Regards,
Robert-Jan

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 05:05:02 GMT

I dont have a spare disk unfortunately to do this to. Any other ideas??

Re: /dev/root

Sridhar Bhaskarla — Thu, 25 Nov 2004 05:07:01 GMT

Darren,

What are those 'sh errors' you are getting when you logon using single-user mode?.

-Sri

Re: /dev/root

Darren Murray_1 — Thu, 25 Nov 2004 05:17:08 GMT

The sh errors are like

sh: more: not found
sh: bdf: not found

Re: /dev/root

John Palmer — Thu, 25 Nov 2004 06:05:53 GMT

Your sh errors are caused because /usr isnt't mounted. They're nothing to do with your original problem.

How long has the server been in this state? It's obviously not a standard installation because you've got vgroot instead of vg00.

The root filesystem doesn't actually get mounted because of its entry in /etc/fstab, it's actually located using pointers held in the volume group (reported by lvlnboot -v).

I suspect that there may be something amiss with the way /dev/vgroot/root is defined.

Could you please post the output from the following:
- lvlnboot -v
- ll /dev/vgroot
- vgdisplay -v vgroot

Regards,
John