Remote load source mirroring can be used to achieve IOP-level or bus-level protection of the load source mirrored pair, even without remote disk units or buses on the system. There is no special setup required, other than to ensure that a disk unit of the same capacity as the load source is attached to another IOP or bus on the system. If you want to achieve bus-level protection of all mirrored pairs in a disk pool, you should configure your system so that no more than one half of the disk units of any given capacity in that disk pool are attached to any single bus. If you want to achieve IOP-level protection of all mirrored pairs in a disk pool, you must have no more than one half of the disk units of any given capacity in the disk pool attached to any single IOP.
After the system hardware is configured correctly, enable remote load source mirroring and start mirroring for the disk pools you want to protect. Use the normal start mirroring function. There is no special start mirroring function for remote load source support. The system detects that remote load source mirroring is enabled and automatically pairs disk units to provide the best level of protection possible. It is not possible to override or influence the pairing of the disk units other than by changing the way the hardware of the system is connected and configured. Typical mirroring restrictions that concern total disk pool capacity, an even number of disk units of each capacity, and such things, apply.