Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 1, Understanding VERITAS Volume Manager

Online Relayout

◆ Change the column stripe width in a volume. See “Example of Increasing the Stripe

Width for the Columns in a Volume” on page 39.

Example of Increasing the Stripe Width for the Columns in a Volume

For details of how to perform online relayout operations, see “Performing Online

Relayout” on page 254. For information about the relayout transformations that are

possible, see “Permitted Relayout Transformations” on page 255.

Limitations of Online Relayout

Note the following limitations of online relayout:

◆ Log plexes cannot be transformed.

◆ Volume snapshots cannot be taken when there is an online relayout operation running

on the volume.

◆ Online relayout cannot create a non-layered mirrored volume in a single step. It

always creates a layered mirrored volume even if you specify a non-layered mirrored

layout, such as mirror-stripe or mirror-concat. Use the vxassist convert

command to turn the layered mirrored volume that results from a relayout into a

non-layered volume. See “Converting Between Layered and Non-Layered Volumes”

on page 260 for more information.

◆ Online relayout can be used only with volumes that have been created using the

vxassist command or the VERITAS Enterprise Administrator (VEA).

◆ The usual restrictions apply for the minimum number of physical disks that are

required to create the destination layout. For example, mirrored volumes require at

least as many disks as mirrors, striped and RAID-5 volumes require at least as many

disks as columns, and striped-mirror volumes require at least as many disks as

columns multiplied by mirrors.

◆ To be eligible for layout transformation, the plexes in a mirrored volume must have

identical stripe widths and numbers of columns. Relayout is not possible unless you

make the layouts of the individual plexes identical.

◆ Online relayout involving RAID-5 volumes is not supported for shareable disk groups

in a cluster environment.