.LP
ZFS pool on\-disk format versions are specified via "features" which replace
the old on\-disk format numbers (the last supported on\-disk format number is
-28). To enable a feature on a pool use the \fBzpool\fR(1M) command to set
-the \fBfeature@\fR\fIfeature_name\fR property to \fBenabled\fR.
+28). To enable a feature on a pool use the \fBupgrade\fR subcommand of the
+\fBzpool\fR(1M) command, or set the \fBfeature@\fR\fIfeature_name\fR property
+to \fBenabled\fR.
.sp
.LP
The pool format does not affect file system version compatibility or the ability
This feature is only \fBactive\fR while \fBfreeing\fR is non\-zero.
.RE
+
+.sp
+.ne 2
+.na
+\fB\fBempty_bpobj\fR\fR
+.ad
+.RS 4n
+.TS
+l l .
+GUID com.delphix:empty_bpobj
+READ\-ONLY COMPATIBLE yes
+DEPENDENCIES none
+.TE
+
+This feature increases the performance of creating and using a large
+number of snapshots of a single filesystem or volume, and also reduces
+the disk space required.
+
+When there are many snapshots, each snapshot uses many Block Pointer
+Objects (bpobj's) to track blocks associated with that snapshot.
+However, in common use cases, most of these bpobj's are empty. This
+feature allows us to create each bpobj on-demand, thus eliminating the
+empty bpobjs.
+
+This feature is \fBactive\fR while there are any filesystems, volumes,
+or snapshots which were created after enabling this feature.
+.RE
+
.SH "SEE ALSO"
\fBzpool\fR(1M)