How to change the LVM Boot Device Hardware Path for a Virtual Partiton?

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Verification

These instructions require that the virtual partition be constrained in the following way:

The logical volume used for the primary swap device must be on the boot device; in other words, boot and swap must be on the same disk device.

This can be verified by the following steps:

1. Run lvlnboot. 

lvlnboot -v /dev/vg00

2. Examine the output to identify the "Boot" and "Swap" logical volumes. For example: 

Boot: lvol1 on: /dev/dsk/c1t6d0
Swap: lvol2 on: /dev/dsk/c1t6d0

3. Make sure that the boot and swap logical volumes are on the same device.

CAUTION: If the boot and swap logical volumes are not on the same device, do not proceed with these instructions. You will need to contact HP for assistance.

Preparation

Before changing the hardware path of the boot device:

1. Create a mapfile for the root volume group. Keep the mapfile inthe root (/) directory, so that it is accessible during single user mode boot. 

vgexport -p -m /mapfile.vg00 /dev/vg00

Get a list of physical volumes (PVs) in the root volume group. Keep the PV list file in the root (/) directory, so that it is accessible during single user mode boot. 

vgexport -p -f /pvs.vg00 /dev/vg00

2. You may now shutdown the virtual partition and physically move the disk.

Change the boot device hardware path

1. From another virtual partition, change the target virtual partition atrributes 

# vparmodify -p partition_name -a io:new_path:boot -B manual
# vparmodify -p partition_name -d io:old_path


where

  • partition_name is the target virtual partition
  • new_path is the new hardware path of the disk
  • old_path is the old hardware path of the disk


2. Verify the attributes 

vparstatus -v -p partition_name

Boot into LVM maintenance mode

Boot the target virtual partition into LVM maintenance mode. For example, at the monitor prompt: 

MON> vparload -o -lm -p partition_name

LVM maintenance mode steps

1. Once the partition comes up in LVM maintenance mode, run ioscan to get the device filename of the boot device 

# ioscan -fnkCdisk

If the device filename (/dev/dsk/file) is new, use insf to install the special files in /dev directory.

2. Run vgscan to get the device filenames grouped withboot device. 

# vgscan

3. Remove the old information about root volume group. 

# vgexport /dev/vg00

You may have to remove /etc/lvmtab.

4. Prepare to import the root volume group (vg00). 

# mkdir /dev/vg00
# mknod /dev/vg00/group c 64 0x00000

5. Import the root volume group (vg00). For example: 

# vgimport -m /mapfile.vg00 /dev/vg00 /dev/dsk/c1t1d0 /dev/dsk/c1t1d1

where the device filenames are obtained from the ioscan and vgscan above

6. Activate the root volume group (vg00): 

# vgchange -a y /dev/vg00

You may also have to cleanup and prepare LVM logical volume to be root, boot, primary swap, or dump volume as follows: 

# lvrmboot -r /dev/vg00
# lvlnboot -b /dev/vg00/lvol1
# lvlnboot -r /dev/vg00/lvol3
# lvlnboot -s /dev/vg00/lvol2
# lvlnboot -d /dev/vg00/lvol2
# mount

7. Verify that the hardware path for the boot device matches the primary boot path. 

# lvlnboot -v /dev/vg00

8. If the hardware path has not changed to the primary boot path, change it by running lvlnboot with the recovery (-R) option. This step is normally not necessary. 

# lvlnboot -R /dev/vg00

9. Reboot the target virtual partition.


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