Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Additional permanent disk space may be required for the destination volumes,
depending on the type of relayout that you are performing. This may happen, for
example, if you change the number of columns in a striped volume.
Figure 1-26 shows how decreasing the number of columns can require disks to be
added to a volume.
Figure 1-26
Example of decreasing the number of columns in a volume
Three columns of length 5L/3Five columns of length L
Note that the size of the volume remains the same but an extra disk is needed to
extend one of the columns.
The following are examples of operations that you can perform using online
relayout:
■ Remove parity from a RAID-5 volume to change it to a concatenated, striped,
or layered volume.
Figure 1-27 shows an example of applying relayout a RAID-5 volume.
Figure 1-27
Example of relayout of a RAID-5 volume to a striped volume
RAID-5 volume Striped volume
Note that removing parity decreases the overall storage space that the volume
requires.
■ Add parity to a volume to change it to a RAID-5 volume.
Figure 1-28 shows an example.
53Understanding Veritas Volume Manager
Online relayout