Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

54 Understanding Veritas Volume Manager
Online relayout
redundancy by mirroring any temporary space used. Read and write access to data is not
interrupted during the transformation.
Data is not corrupted if the system fails during a transformation. The transformation
continues after the system is restored and both read and write access are maintained.
You can reverse the layout transformation process at any time, but the data may not be
returned to the exact previous storage location. Any existing transformation in the volume
must be stopped before doing a reversal.
You can determine the transformation direction by using the
vxrelayout status
volume command.
These transformations are protected against I/O failures if there is sufficient redundancy
and space to move the data.
Transformations and volume length
Some layout transformations can cause the volume length to increase or decrease. If either
of these conditions occurs, online relayout uses the
vxresize(1M) command to shrink
or grow a file system as described in “Resizing a volume” on page 276.