VERITAS Volume Manager 4.1 Administrator's Guide

Administering Disks

Rootability

Chapter 2 91

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 with changes that you

make to the VxVM root disk. See “Creating an LVM Root Disk from a VxVM

Root Disk” on page 91 for a description of how to create a bootable LVM root

disk from the VxVM root disk.

For more information, see the vxcp_lvmroot(1M), vxrootmir(1M), vxdestroy_lvmroot(1M)

and vxres_lvmroot (1M) manual pages.

Creating an LVM Root Disk from a VxVM Root Disk

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

In some circumstances, it may be necessary to boot the system from an LVM root disk. If an

LVM root disk is no longer available or an existing LVM root disk is out-of-date, you can use

the vxres_lvmroot command to create an LVM root disk on a spare physical disk that is not

currently under LVM or VxVM control. The contents of the volumes on the existing VxVM

root disk are copied to the new LVM root disk, and the LVM disk is then made bootable. This

operation does not remove the VxVM root disk or any mirrors of this disk, nor does it affect

their bootability.

NOTE The target disk must be large enough to accommodate the volumes from the

VxVM root disk.

This example shows how to create an LVM root disk on physical disk c0t1d0 after removing

the existing LVM root disk conﬁguration from that disk.