MFV r268121:

4924 LZ4 Compression for metadata

illumos/illumos-gate@b8289d24d866c1af02d7007348f7f057693c15d3

MFC after:	2 weeks

1 files changed, 12 insertions, 9 deletions

diff --git a/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7 b/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7
index d0f3ab2..437b374 100644
--- a/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7
+++ b/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7
@@ -23,7 +23,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 30, 2014
+.Dd July 1, 2014
 .Dt ZPOOL-FEATURES 7
 .Os
 .Sh NAME
@@ -235,14 +235,11 @@ administrator can turn on
 compression on any dataset on the
 pool using the
 .Xr zfs 8
-command. Please note that doing so will
-immediately activate the
-.Sy lz4_compress
-feature on the underlying
-pool
-.Pq even before any data is written ,
-and the feature will not be
-deactivated.
+command.
+Also, all newly written metadata
+will be compressed with
+.Sy lz4
+algorithm.
 Since this feature is not read-only compatible, this
 operation will render the pool unimportable on systems without support
 for the
@@ -251,6 +248,12 @@ feature.
 Booting off of
 .Sy lz4
 -compressed root pools is supported.
+.Pp
+This feature becomes
+.Sy active
+as soon as it is enabled and will
+never return to being
+.Sy enabled .
 .It Sy multi_vdev_crash_dump
 .Bl -column "READ\-ONLY COMPATIBLE" "com.joyent:multi_vdev_crash_dump"
 .It GUID Ta com.joyent:multi_vdev_crash_dump