Hitachi AMS2100 User Manual page 40

Figure 1-8: Cascade connection of SnapShot with ShadowImage
• LU Ownership
When cascading SnapShot and ShadowImage, the LU Ownership is
the same as the owner controller which contains the data pool for
SnapShot. If pairs are placed disproportionately in the controllers
whose ownership is the same, the load is concentrated and the
performance may deteriorate. Specify the ownership so that the the
load can be diversified.
Also, the Loadbalancing feature does not apply to a ShadowImage
pair that is cascaded with a SnapShot pair.
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SnapShot overview
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide