VERITAS Volume Manager 3.1 Administrator's Guide

Volume Manager Operations
Online Relayout
Chapter 3 97
Online Relayout
NOTE You may need an additional license to use this feature.
Online Relayout allows you to convert any supported storage layout in
the Volume Manager to any other, in place, with uninterrupted data
access.
You usually change the storage layout in the Volume Manager to change
the redundancy or performance characteristics of the storage. The
Volume Manager adds redundancy to storage either by duplicating the
address space (mirroring) or by adding parity (RAID-5). Performance
characteristics of storage in the Volume Manager can be changed by
changing the striping parameters which are the number of columns and
the stripe width.
Layout changes can be classified into these types:
• RAID-5 to mirroring and mirroring to RAID-5
• adding or removing parity
• adding or removing columns
• changing stripe width
Storage Layout
Online Relayout currently supports these storage layouts:
• concatenation
• striped
• RAID-5
• mirroring (also supported where data is duplicated across different
storage devices)
• striped-mirror
• concatenated-mirror