VERITAS Volume Manager 3.5 Migration Guide (September 2004)

Chapter 2

Converting LVM to VxVM

Examples

we are unable to stop and export any of the Volume Groups, then

the conversion process will not be able to complete without a

reboot. You would then be given the choice to either abort the

conversion, or finish the conversion by rebooting the system.

The conversion process will update the /etc/fstab file so that

volume devices are used to mount the file systems on this disk

device. You will need to update any other references such as

backup scripts, databases, or manually created swap devices. If

you do not like the default names chosen for the corresponding

logical volumes, you may change these to whatever you like

using vxedit.

Second Stage Conversion Analysis of vg08

Analysis of vg08 found insufficient Private Space for conversion

SMALLEST VGRA space = 176

RESERVED space sectors = 78

PRIVATE SPACE/FREE sectors = 98

AVAILABLE sector space = 49

AVAILABLE sector bytes = 50176

RECORDS neededs to convert= 399

MAXIMUM records allowable = 392

The smallest disk in the Volume Group (vg08) does not have

sufficient private space for the conversion to succeed. There

is only enough private space for 392 VM Database records and

the conversion of Volume Group (vg08) would require enough

space to allow 399 VxVM Database records. This would roughly

translate to needing an additional 896 bytes available in the

private space. This can be accomplished by reducing the number

of volumes in the (vg08) Volume Group, and allowing that for

every volume removed, the number of Database records required

would be reduced by three. This is only a rough approximation,

however.

Hit RETURN to continue.

Example: list, listvg, and vxprint outputs of an LVM volume group before and

after conversion

The examples given below, shows the vxvmconvert listvg, list, and vxprint output for an LVM volume

group vg08 converted to a VxVM disk group dg08.

Example of the vxvmconvert listvg output before conversion of volume group vg08:

LVM VOLUME GROUP INFORMATION

NAME TYPE PHYSICAL VOLUME

vg00 ROOT c0t5d0

vg08 Non-Root c0t8d0

vg09 Non-Root c0t9d0