Managing Systems and Workgroups: A Guide for HP-UX System Administrators

Administering a System: Managing Disks and Files

Managing Disks

Chapter 6 579

Whether you use a single “combined” root-boot logical volume, or

separate root and boot logical volumes, the logical volume used to boot

the system must be the ﬁrst logical volume on its physical volume. If the

root logical volume is not the ﬁrst logical volume on its physical volume,

then you must also conﬁgure a boot logical volume. Both a root logical

volume and a boot logical volume must be contiguous with bad block

relocation disabled.

If you newly install your 11.00 system and choose the LVM conﬁguration,

a root volume group is automatically conﬁgured, as are separate root and

boot logical volumes. If you currently have a combined root and boot

logical volume and you wish to reconﬁgure to separate root and boot

logical volumes, after creating the boot logical volume, you will need to

use the lvlnboot (1M) command with the -b option to deﬁne the boot

logical volume to the system, taking effect the next time the system is

booted. For example:

lvlnboot -b /dev/vgroot/bootlv

If you decide you want to create a root volume group “from scratch” that

will contain an alternate boot disk, you can follow the steps below. You

can also use these steps, with some minor changes, if you need to modify

an existing root logical volume, including increasing its size, or perhaps

changing your conﬁguration to a combined root-boot logical volume.

When modifying an existing root logical volume, be sure to back up your

current root logical volume before proceeding and then copy it back to the

new ﬁle system upon completion.

Step 1. Create a physical volume using pvcreate with the -B option. -B creates

an area on the disk for a LIF volume, boot utilities, and a BDRA (Boot

Data Reserved Area).

NOTE The BDRA must exist on each bootable disk within the root volume

group. The BDRA maintains the information that the kernel requires

about the logical volume that contains the root, as well as those that

contain primary swap and dump.

See lif (4) for more information on LIF volumes.

For example:

pvcreate -B /dev/rdsk/c0t3d0