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57Understanding Veritas Volume Manager
Online relayout
Figure 1-30 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 294. For information about the relayout transformations that
are possible, see “Permitted relayout transformations” on page 295.
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 300 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.
■ Online relayout cannot transform sparse plexes, nor can it make any plex
sparse. (A sparse plex is not the same size as the volume, or has regions that
are not mapped to any subdisk.)