VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Chapter 2 88

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.

NOTE The target disk for a mirror that is added using the vxrootmir command

must be large enough to accommodate the volumes from the VxVM root

disk.

After successfully rebooting the system from a VxVM root disk to init

level 1, you can use the vxdestroy_lvmroot command to completely

remove the original LVM root disk (and its associated LVM volume

group), and re-use this disk as a mirror of the VxVM root disk, as shown

in this example:

# /etc/vx/bin/vxdestroy_lvmroot -v c0t0d0

# /etc/vx/bin/vxrootmir -v -b c0t0d0

NOTE You can keep the LVM root disk if you ever need a boot disk that does not

depend on the presence of VxVM on the system. However, this may

require that you update the contents of the LVM root disk in parallel