The Add Disk Unit and New Disk Pool wizards guide you through
the process of adding pairs of similar capacity disk units to a protected
disk pool. When you have your disks configured correctly, you are ready to
start mirroring for mirrored protection. Mirrored protection is local to a
single server and is distinct from cross-site mirroring or geographic mirroring.
If you want to start mirroring on an Independent disk pools that
is unavailable, you can do so when your system is fully restarted. For all
other disk pools, you need to restart your system to the dedicated service
tools (DST) mode before starting mirrored protection. 
To start mirroring, follow these steps:
- In iSeries™ Navigator, expand Disk Units.
- Expand Disk Pools.
- Right-click the disk pools you want to mirror, and select Start Mirroring.