Figure 10–1 illustrates a mirror, d20. The mirror is made of two volumes (submirrors) d21 and d22.
Solaris Volume Manager makes duplicate copies of the data on multiple physical disks, and presents one virtual disk to the application, d20 in the example. All disk writes are duplicated. Disk reads come from one of the underlying submirrors. The total capacity of mirror d20 is the size of the smallest of the submirrors (if they are not of equal size).