Mapped volumes can be used in pairs for Thin Image, but internal and external volumes cannot be used together in the same pool and all external volumes in a pool must use the same Cache Mode setting.
After you map and format an external volume, it is ready to use as a pair volume. The following figure shows an example of an external volume used as a pool-VOL.
Note: When using a DP-VOL in Dynamic Provisioning, Dynamic Tiering, or active flash, follow Restrictions on copying volumes using Universal Volume Manager with DP-VOLs.