Example -- Mirrored Metadevice

Figure 2-4 illustrates a mirror, d2, made of two metadevices (submirrors) d20 and d21.

DiskSuite software takes duplicate copies of the data located on multiple physical disks, and presents one virtual disk to the application. All disk writes are duplicated; when reading, data only needs to be read from one of the underlying submirrors. The total capacity of mirror d2 is the size of the smaller of the submirrors (if they are not equal sized).

Figure 2-4 Mirror Example