HP StorageWorks IBM AIX Kit V3.0B for Enterprise Virtual Array Installation and Configuration Guide (AA-RUHAB-TE, October 2003)

Understanding the Enterprise Virtual Array
22 IBM AIX Kit V3.0B for Enterprise Virtual Array Installation and Configuration Guide
Virtual RAID Considerations
Virtual RAID helps determine the level to which user data is protected—VraidX,
where X can be 0, 1, or 5. Redundancy is directly proportional to cost in terms of
storage usage—the greater the level of data protection, the more storage space is
required. There are three types of redundancy available with the Enterprise Virtual
Array:
■ Vraid0—No failure tolerance of data is provided.
■ Vraid1—All data is duplicated within the storage system. This is the highest
level of storage use with the lowest amount of read/write overhead.
■ Vraid5—All data is protected by parity. This is the lowest level of storage use
while maintaining redundancy, at a cost of a higher amount of read/write
overhead.