On Oracle Solaris 11.2 systems, ZFS data cannot be easily reclaimed for other uses.
No explicit error message is displayed. The primary symptom is that application processing is slower because physical memory is unnecessarily restricted.
Workaround: Use the new user_reserve_hint_pct tunable parameter to provide a hint to the system about application memory usage. This hint can be used to limit growth of the ZFS ARC cache so that more memory stays available for applications.
For a detailed description of using this new parameter, see the Memory Management Between ZFS and Applications in Oracle Solaris 11.2 MOS article.