topic Re: Not able to boot from another boot disk. in Operating System - HP-UX

Not able to boot from another boot disk.

Richard_243 — Wed, 26 May 2004 08:18:43 GMT

I have one disk which is internal disk located at /dev/rdsk/c0t6d0 from where i am able to boot.
I have another disk which is extrenal and i have made it alternate boot disk via following procedure

1) pvcreate -B /dev/rdsk/Cxtxdx

2) mkboot /dev/rdsk/Cxtxdx

3)mkdir /dev/vglvmroot

4)mknod /dev/vglvmroot/group c 64 0x020000

5)vgcreate /dev/vglvmroot /dev/dsk/Cxtxdx

6)vgscan

7)lvcreate -L 120 -n boot -C y -r n /dev/vglvmroot

8)lvcreate -L 120 -n root -C y -r n /dev/vglvmroot

9)lvcreate -L 64 -n swap -C y /dev/vglvmroot

10)lvcreate -L 64 -n dump -C y /dev/vglvmroot

l110vlnboot -r /dev/vglvmroot/root

12) lvlnboot -s /dev/vglvmroot/swap

13) lvchange -r n /dev/vglvmroot/dump
14) lvlnboot -v /dev/vglvmroot

aftre doing this i change the setboot path to the extrenal disk and tried to reboot it .It stopps near ISL>
what could be the problem.
It is ot getting /stand/vmunix kernel to boot.

Aftre that i tried this following option too
mkboot -a "hpux -lq (;0) /stand/vmunix" /dev/rdsk/cXtXdX
But still does not boot from extrenal disk.

Re: Not able to boot from another boot disk.

Patrick Wallek — Wed, 26 May 2004 08:32:07 GMT

Unless I'm missing something, you created the logical volumes but you never did a newfs or did anything to actually get data into the LV.

How is the machine supposed to boot if there is nothing for it to boot from.

Do you have Mirror Disk installed? If so there is a much better way to make a second boot disk. If you don't have Mirror Disk, there is a procedure you can use to create another boot disk.

Have a look at this thread for a complete procedure to create a copy of your boot disk via dd.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=236549

Re: Not able to boot from another boot disk.

Geoff Wild — Wed, 26 May 2004 08:34:12 GMT

When you issue:

/usr/sbin/lvlnboot -v

You should see 2 "Boot Disks" - if not then you only have 1:

Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c28t5d0 (0/0/0/3/0.5.0) -- Boot Disk
/dev/dsk/c0t6d0 (1/0/0/3/0.6.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c28t5d0
/dev/dsk/c0t6d0
Root: lvol3 on: /dev/dsk/c28t5d0
/dev/dsk/c0t6d0
Swap: lvol2 on: /dev/dsk/c28t5d0
/dev/dsk/c0t6d0
Dump: lvol2 on: /dev/dsk/c0t6d0, 0

How to mirror the root disk

Say /dev/dsk/c0t6d0 is the root disk and /dev/dsk/c3t6d0 is the disk you want to make a mirror of.

1. Create a bootable LVM disk to be used for the mirror.
pvcreate -B /dev/rdsk/c3t6d0
2. Add this disk to the current root volume group.
vgextend /dev/vg00 /dev/dsk/c3t6d0
3. Make the new disk a boot disk.
mkboot -l /dev/rdsk/c3t6d0
4. Copy the correct AUTO file into the new LIF area.
mkboot -a "hpux -lq (;0)/vmunix" /dev/rdsk/c3t6d0
5. Mirror the boot, root and primary swap logical volumes to the new
bootable disk. Ensure that all devices in vg00, such as /usr, /swap,
etc., are mirrored.
The following is an example of mirroring the boot logical volume:
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c3t6d0
The following is an example of mirroring the primary swap logical
volume:
lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/c3t6d0
The following is an example of mirroring the root logical volume:
lvextend -m 1 /dev/vg00/lvol3 /dev/dsk/c3t6d0
6. Update the boot information contained in the BDRA for the mirror
copies of boot, primary swap and root.
/usr/sbin/lvlnboot -b /dev/vg00/lvol1
/usr/sbin/lvlnboot -s /dev/vg00/lvol2
/usr/sbin/lvlnboot -r /dev/vg00/lvol3
7. Check if the BDRA is correct.
/usr/sbin/lvlnboot -R /dev/vg00
8. Verify that the mirrors were properly created.
lvlnboot -v /dev/vg00
The output of this command is shown in a display like the following:
Boot Definitions for Volume Group /dev/vg00:
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c0t6d0 (1/0/0/3/0.6.0) -- Boot Disk
/dev/dsk/c3t6d0 (1/0/1/0/0/1/1.6.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c0t6d0
/dev/dsk/c3t6d0
Root: lvol3 on: /dev/dsk/c0t6d0
/dev/dsk/c3t6d0
Swap: lvol2 on: /dev/dsk/c0t6d0
/dev/dsk/c3t6d0
Dump: lvol2 on: /dev/dsk/c0t6d0, 0

vgdisplay -v vg00

Then lvextend for all other lvols:

lvextend -m 1 /dev/vg00/lvol4 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol5 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol6 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol7 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol8 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol9 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol10 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol11 /dev/dsk/c3t6d0

Re: Not able to boot from another boot disk.

Sridhar Bhaskarla — Wed, 26 May 2004 09:43:04 GMT

Richard,

I go with Patrick here. You just created logical volumes without any filesystems to actually copy the data. Obviously it won't find /stand/vmunix as it is not there.

The procedure you noted down won't work. You will need to modify it to include other logical volumes such as /usr, /var etc.,. Also, you will need to either copy the data or do a dd from the existing logical volumes.

-Sri

Re: Not able to boot from another boot disk.

Kent Ostby — Wed, 26 May 2004 10:54:58 GMT

Are you making a copy of your current boot disk ?

If so follow the example above that has you doing lvextends etc.

If you want a seperate OS boot disk, then just install the OS onto that disk and make it bootable that way.

As noted by others, you have not copied any data over so there is nothing for the system to use to boot up on.

Best regards,

Kent M. Ostby

Re: Not able to boot from another boot disk.

KapilRaj — Wed, 26 May 2004 11:09:25 GMT

Your procedure needs a change

create boot,swap and then root u should be alright u need not have a seperate dump u may use the swap as dump

Kaps

Re: Not able to boot from another boot disk.

KapilRaj — Wed, 26 May 2004 11:13:34 GMT

I missed it ,u need to copy every thing from current disk to the new to boot !

Kaps

Re: Not able to boot from another boot disk.

Ashwani Kashyap — Wed, 26 May 2004 14:58:01 GMT

YOu can undo what you did and follow this document :
http://www1.itrc.hp.com/service/cki/search.do?category=c0&mode=id&searchString=LVMKBRC00005103&searchCrit=allwords&docType=Security&docType=Patch&docType=EngineerNotes&docType=BugReports&docType=Hardware&docType=ReferenceMaterials&docType=ThirdParty&search.x=17&search.y=9

Re: Not able to boot from another boot disk.

Naveej.K.A — Wed, 26 May 2004 22:13:15 GMT

hi,

did you miss this one

mkboot -l /dev/rdsk/c0t5d0

and you lvlnboot info is conrrect..

with best wishes
Naveej

Re: Not able to boot from another boot disk.

Kyri Pilavakis — Thu, 27 May 2004 04:35:00 GMT

I ahve a simple procedure to create a mirrored boot disk. Please see attached file.
Hope it helps..