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58 Understanding Veritas Volume Manager
Online relayout
■ The number of mirrors in a mirrored volume cannot be changed using
relayout.
■ Only one relayout may be applied to a volume at a time.
Transformation characteristics
Transformation of data from one layout to another involves rearrangement of
data in the existing layout to the new layout. During the transformation, online
relayout retains data 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 284.