VERITAS Volume Manager 3.5 Migration Guide (September 2004)

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Chapter 3

Command Differences

Comparison of LVM and VxVM Tasks

This section contains a list of tasks which you can perform using LVM, and near equivalent tasks which you

can perform using the VERITAS Volume Manager. You can perform the LVM tasks by using SAM or the

command line interface. Similarly, you can choose to perform VxVM tasks by using the VERITAS Volume

Manager Storage Administrator or from the command line interface. This document focuses on the command

line interface.

NOTE The following features in VxVM require an additional license: Mirroring, Mirroring and

Striping, Dynamic Multipathing of Active/Active Devices, Hot-relocation, Online Migration,

and RAID-5.

All the VxVM tasks listed in the task comparison chart can be performed by the VERITAS Volume Manager

Storage Administrator. For more information, refer to the VERITAS Volume Manager Storage Administrator

Administrator’s Guide.

For more information on LVM commands, refer to HP-UX Managing Systems and Workgroups, and LVM

manual pages in the Reference Volumes 2, 3, and 5. For information on VxVM commands, refer to the

VERITAS Volume Manager documentation package (see the “Preface” on page iii).

NOTE Mirroring of a VxVM root disk is supported in this release.

Mirroring in LVM is supported only if you have MirrorDisk/UX already installed as an add-on

product. In addition, mirroring in VxVM requires an additional license.

NOTE Footnote for Table 3-2:

Example for a

disk_group

= veritasdg,

medianame

= disk01,

vol_name

-= veritasvol,

plex

name

= veritasvol-01,

subdisk

-= disk01-01,

devicename

= c0t0d0.

Table 3-2 LVM and VxVM Task Comparison

Task

Type

Description Example

LVM Create an LVM disk. pvcreate /dev/rdsk/

disk_name

VxVM Bring a disk under Volume Manager

control.

vxdiskadd

device_name

Option 1 in the vxdiskadm menu adds a disk and

initializes it.

LVM Create a volume group vgcreate /dev/

vol_grp

/dev/dsk/

disk_name

VxVM Create a disk group. vxdg init

disk_group disk_name

Option 1 in the vxdiskadm menu performs this

task.