Logical partitions

When you create a logical volume, you specify the number of logical partitions for the logical volume.

A logical partition is one, two, or three physical partitions, depending on the number of instances of your data you want maintained. Specifying one instance means there is only one copy of the logical volume (the default). In this case, there is a direct mapping of one logical partition to one physical partition. Each instance, including the first, is termed a copy. Where physical partitions are located (that is, how near each other physically) is determined by options you specify when you create the logical volume.