VERITAS Volume Manager 4.1 Administrator's Guide

Chapter 2 90

Setting up a VxVM Root Disk and Mirror

NOTE These procedures should be carried out at init level 1.

To set up a VxVM root disk and a bootable mirror of this disk, use the vxcp_lvmroot utility.

This command initializes a speciﬁed physical disk as a VxVM root disk named rootdisk##

(where ## is the ﬁrst number starting at 01 that creates a unique disk name), copies the

contents of the volumes on the LVM root disk to the new VxVM root disk, optionally creates a

mirror of the VxVM root disk on another speciﬁed physical disk, and make the VxVM root

disk and its mirror (if any) bootable by HP-UX.

The following example shows how to set up a VxVM root disk on the physical disk c0t4d0:

# /etc/vx/bin/vxcp_lvmroot -v -b c0t4d0

NOTE The -b option to vxcp_lvmroot uses the setboot command to deﬁne c0t4d0 as

the primary boot device. If this option is not speciﬁed, the primary boot device

is not changed.

If the destination VxVM root disk is not big enough to accommodate the contents of the LVM

root disk, you can use the -R option to specify a percentage by which to reduce the size of the

ﬁle systems on the target disk. (This takes advantage of the fact that most of these ﬁle

systems are usually nowhere near 100% full.) For example, to specify a size reduction of 30%,

the following command would be used:

# /etc/vx/bin/vxcp_lvmroot -R 30 -v -b c0t4d0

The verbose option, -v, is speciﬁed to give an indication of the progress of the operation.

CAUTION Only create a VxVM root disk if you also intend to mirror it. There is no beneﬁt

in having a non-mirrored VxVM root disk for its own sake.

The next example uses the same command and additionally speciﬁes the -m option to set up a

root mirror on disk c1t1d0:

# /etc/vx/bin/vxcp_lvmroot -m c1t1d0 -R 30 -v -b c0t4d0

In this example, the -b option to vxcp_lvmroot sets c0t4d0 as the primary boot device and

c1t1d0 as the alternate boot device.

This command is equivalent to using vxcp_lvmroot to create the VxVM-rootable disk, and

then using the vxrootmir command to create the mirror:

# /etc/vx/bin/vxcp_lvmroot -R 30 -v -b c0t4d0

# /etc/vx/bin/vxrootmir -v -b c1t1d0

The disk name assigned to the VxVM root disk mirror also uses the format rootdisk## with

## set to the next available number.