ZFS supports compression and deduplication, which can significantly reduce storage requirements.
If deduplication is active, storing the Deduplication Table (DDT) on a dedicated flash vdev prevents the severe performance degradation that occurs when the DDT overflows physical RAM. 2. Advanced Performance Tuning freebsd mastery advanced zfs pdf
A specific section (Chapter 10) covering "ZFS surgery," such as splitting mirrored pools, recovering destroyed pools, and using the ZFS debugger ( zdb ). Reviewer Highlights ZFS supports compression and deduplication