Visit Our UNIX and Linux User Community


HP-UX LVM Maint. Mode


 
Thread Tools Search this Thread
Operating Systems HP-UX HP-UX LVM Maint. Mode
# 1  
Old 02-21-2002
HP-UX LVM Maint. Mode

What exactly happens when you boot HP-UX with the -lm flag?
Quote:
hpux -lm
We tried this the other night, with some wacky results...
We poked around, and found that / was mounted to /dev/rroot (I think... maybe it was just /dev/root). So, (still playing) we activated the volume group (lvchange -ay), and created a directory /oldroot. We mounted /dev/vg00/lvol3 to /oldroot (after running fsck), then changed directory to /oldroot. There, to our disbelief, was a new directory (mixed in with the others) called "/oldroot". That's a wierd thing to see... But THAT oldroot was empty, so it wasn't totally recursive.

We unmounted everything and rebooted... Upon coming back up, the machine rebooted again automatically (a guess is that we forgot to deactive the volume group first, so it fixed out mistake and rebooted), then hung for about 20 minutes upon reaching the cleaning of editor crash files. It bounced back and forth from "busy" to "wait"...

So how did that happen? Is /dev/rroot just the raw device attached to the / filesystem? If so, how could it be mounted? And how could it be mounted twice?

I think my head is about to implode, so I had better stop typing...
# 2  
Old 02-21-2002
Maintenance mode is intended only to enable you to rebuild the LVM data in the LIF area of boot disk after it has been damaged. It ignores the LVM data (which is in the LIF file "LABEL" ). There are two cases. Either the area after the boot area is the root filesystem or it is the /stand filesystem. In either case it must be contiguous and it must be an hfs filesystem so the boot program hpux can find the kernel. In maintenance mode, it is assumed to start after the boot area and consume the rest of the disk. But if it is /stand, a file called /stand/rootconf is read (by the kernel) and this is used to find the start of the root filesystem which is also assumed to extend to the end of the disk. This leaves them overlapping each other as well as any other logical volumes.

The result is that the kernel is running and root is mounted with nothing else. At this point you are supposed to rebuild the LVM info in the boot area. This typically involves using mkboot, vgcfgrestore, and lvlnboot. It is crucial that the disk not be synced at all. Either "reboot -n" or cycle power to exit maintenance mode.

Activating the root volume group is explicitly prohibited...doing so may corrupt it.

The kernel knew that oldroot on /dev/root was a mount point but it didn't know that oldroot on /dev/vg00/lvol3 was a mount point. That why you saw a difference.

Was /oldroot pre-existing? Even a "mkdir /oldroot" is very risky in maintenance mode. HP-UX syncs some metadata right away. That might be enough to garble the static data in your root filesystem's superblock, but I'm not sure.
# 3  
Old 02-22-2002
Wow, I guess we got lucky then, huh?

/oldroot was not pre-existing... It was created to mount lvol3...
We did not remove it, and it was still there on reboot, so the disk did sync at some point. And we rebooted with reboot -qn.

I know it was risky, and perhaps (in hindsight, of course) a little sloppy, but that's what this particular box is for here - a learning tool and a training machine.

(Note to self: ask these questions before doing the action next time... Smilie )

Previous Thread | Next Thread
Test Your Knowledge in Computers #934
Difficulty: Medium
The C standard library does not specify any specific resolution, epoch, range, or datatype for system time values.
True or False?

9 More Discussions You Might Find Interesting

1. Solaris

Maint, resyncing and last-erred notifications

Hi fellow members! I have a oracle solaris server with two internal disks, that acts as an authentication server only, and for now the server seems to be doing its job, but when typing metastat -c I get some notifications. I am not familiar with SVM, I wonder if someone can help me on this:... (3 Replies)
Discussion started by: fretagi
3 Replies

2. HP-UX

From a C++ application how to find if a hpux host is in standard mode or trusted mode

is there a way for my C++ application to find out which mode the hpux OS is running in? standard mode or trusted mode. (3 Replies)
Discussion started by: einsteinBrain
3 Replies

3. Solaris

DNS service is in maintenance mode. How to bring it back to online mode?

:confused: when i tried to look the status of DNS-client, it is in maintenance mode..... Please tell me how to bring it back to online mode...PLEASE TELL ME STEP BY STEP.... PLEASE... :wall: (2 Replies)
Discussion started by: vamshigvk475
2 Replies

4. UNIX for Dummies Questions & Answers

How to convert non LVM root partition to LVM?

Hi Guys, I m using redhat 6, I have installed root partition as non-LVM . Is there any way i can convert it to LVM? (1 Reply)
Discussion started by: pinga123
1 Replies

5. UNIX for Advanced & Expert Users

What is the difference between single line mode and multiline mode in Regular expressions?

Hi All, Can please let me know what is the difference between the single line mode and multi line mode in regular expresions? Thanks, Chidhambaram B (3 Replies)
Discussion started by: chidhu.anu
3 Replies

6. HP-UX

How to reduce LVM to create another LVM

Hi, I'm new to HP-UX. I have LVM on /var with 92Gig. I would like to reduce it to create another LVM for Oracle client with 800 meg or so. How to do it. I'm running 11.iv3 Thanks (4 Replies)
Discussion started by: lamoul
4 Replies

7. HP-UX

how to distinguish standard system mode or trust system mode

I think that if the directory /tcb exists, HP-UX is in trusted mode and the passwd data is somewhere in /tcb/files/auth. But that's all I remember. Also I think recent versions of HP-UX can have a /etc/shadow file. (0 Replies)
Discussion started by: Perderabo
0 Replies

8. SuSE

Convet Linux OS from text mode to graphic mode

Hi All, I used to have my suse linux(VM) server in graphic mode but not anymore since morning. I cant rolback since i loose somuch work. Any idea how to it back to normal. Thanks (6 Replies)
Discussion started by: s_linux
6 Replies

9. UNIX for Dummies Questions & Answers

Maint user cannot execute ping command

I want give rights for the maint user to execute the "ping" command. Currently root user can execute the "ping" command, but the maint user is not able to execute the command. (3 Replies)
Discussion started by: kabeer_n
3 Replies

Featured Tech Videos