/ on /dev/root instead of /dev/vg00/lvol3

[Daniel D.B. Shafer Sr.]

This is probably simple, but...

We 7 systems, all identical for the most part. All but one have / mounted on /dev/vg00/lvol3. All 7 have "/dev/vg00/lvol3 / vxfs delaylog 0 1" as the first line in /etc/fstab. Yet one mounts / on /dev/root. Can anyone enlightend a beginner as to what governs this mount other than /etc/fstab?

Thanks.

[Pete Randall]

The usual reason I've seen for this is that the system was booted in LVM maintenance mode. A simple reboot should clear the condition.


Pete

[Keely Jackson · Accepted solution]

Hi

We had this before. Soultion was to delete /etc/mnttab and recreate it. A simple mount -a will do that for you.

Cheers
Keely

[eran maor]

Hi

pete is rigth , when you boot to maintence mode your volume group is not active so the system create the /dev/root for the lvol3 .

do a reboot to your system and this need to solve your problem .

if a reboot will not solve this issue you can boot to maintence mode again do a vgexport to /dev/root and then vgimport to the /dev/vg00

[Ravi_8]

Hi,
could you check /etc/passwd file. shell for root user should be sh (/sbin/sh)

#init 3
or
#reboot
command should solve this problem

[john korterman]

Hi,
I can see the same thing every day on a 10.20 machine. The machine has been booted many times since "something happend" that caused /dev/root to appear. I was not present when ???something happened??? and the story has probably got a little extra colour every time it has been told ??? the short version: a person, who apparently did not know where he was, started a mass-deletion of files on the machine in question. As the deletion lasted a bit longer than expected, he became aware of his mistake and stopped the deletion. It has never been quite clear how much had been deleted, but he replaced many files in /var and /etc by copying them from a similar machine. Strangely enough, the machine could reboot successfully afterwards.
But keeping that in mind, I think that the occurrance of /dev/root does not signify a very healthy system. Check also Bill Hassel's answer in this thread:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x25337b8d1de3d5118ff40090279cd0f9,00.html

I must admit that I have not tried any of the solutions suggested in the thread.

regards,
John K.

[Daniel D.B. Shafer Sr.]

Ravi, I checked /etc/passwd as you suggested androot's shell was /sbin/sh already.

Pete and eran, now I have to dive into LVM maintenance mode and see what that's about. How to use it and how to get out of it.

Keely, recreating mnttab worked while interactive.

I rebooted and it stuck.

Thanks all.
Daniel

[Ravi_8]

Hi

deleting /etc/lvmtab is foolishness. mount -a will look into this file to check for the devices which are all belongs to the vg's.

Now the solution is to get into single user mode
. mount the file systems manually
(i.e /sbin/mount /dev/vg00/lvolx / look at other m/c bdf o/p)
. lvlnboot -v
. vgscan -a -v
. reboot

[Martin Johnson]

No reboot is necessary. As stated before, delete /etc/mnttab and do a mountall or mount -a to recreate the file.

HTH
Marty