Compaq StorageWorks HSZ80 Configuration And Cli Reference Manual page 200

5–14 CLI Commands
Specify READ_SOURCE=ROUND_ROBIN to sequentially direct read requests to
each local mirrorset disk. The controller equally queries all normal local disks for
each read request. If no normal local disk exists, then the controller will query the
remote disks.
Examples
This example shows how to add DISK10000, DISK20100, and DISK30200 as a
mirrorset with the name MIRR1:
ADD DISK DISK10000 1 0 0
ADD DISK DISK20100 2 1 0
ADD DISK DISK30200 3 2 0
ADD MIRRORSET MIRR1 DISK10000 DISK20100 DISK30200
This example creates a host-addressable unit after the mirrorset MIRR1 has been
created:
INITIALIZE MIRR1
ADD UNIT D104 MIRR1