Add -p switch to "zpool get"

[zfs.git] / man / man5 / zpool-features.5

diff --git a/man/man5/zpool-features.5 b/man/man5/zpool-features.5
index 0ab179e..243fc76 100644 (file)
--- a/man/man5/zpool-features.5
+++ b/man/man5/zpool-features.5
@@ -1,5 +1,6 @@
 '\" te
 .\" Copyright (c) 2012 by Delphix. All rights reserved.
+.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
 .\" The contents of this file are subject to the terms of the Common Development
 .\" and Distribution License (the "License").  You may not use this file except
 .\" in compliance with the License. You can obtain a copy of the license at
@@ -12,7 +13,7 @@
 .\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your
 .\" own identifying information:
 .\" Portions Copyright [yyyy] [name of copyright owner]
-.TH ZPOOL-FEATURES 5 "Mar 16, 2012"
+.TH ZPOOL-FEATURES 5 "Feb 4, 2013"
 .SH NAME
 zpool\-features \- ZFS pool feature descriptions
 .SH DESCRIPTION
@@ -21,7 +22,7 @@ zpool\-features \- ZFS pool feature descriptions
 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 \fBupgrade\fR subcommand of the
-\fBzpool\fR(1M) command, or set the \fBfeature@\fR\fIfeature_name\fR property
+\fBzpool\fR(8) command, or set the \fBfeature@\fR\fIfeature_name\fR property
 to \fBenabled\fR.
 .sp
 .LP
@@ -101,7 +102,7 @@ Some features may make on\-disk format changes that do not interfere with other
 software's ability to read from the pool. These features are referred to as
 "read\-only compatible". If all unsupported features on a pool are read\-only
 compatible, the pool can be imported in read\-only mode by setting the
-\fBreadonly\fR property during import (see \fBzpool\fR(1M) for details on
+\fBreadonly\fR property during import (see \fBzpool\fR(8) for details on
 importing pools).
 .SS "Unsupported features"
 .sp
@@ -197,5 +198,38 @@ This feature is \fBactive\fR while there are any filesystems, volumes,
 or snapshots which were created after enabling this feature.
 .RE
 
+.sp
+.ne 2
+.na
+\fB\fBlz4_compress\fR\fR
+.ad
+.RS 4n
+.TS
+l l .
+GUID   org.illumos:lz4_compress
+READ\-ONLY COMPATIBLE  no
+DEPENDENCIES   none
+.TE
+
+\fBlz4\fR is a high-performance real-time compression algorithm that
+features significantly faster compression and decompression as well as a
+higher compression ratio than the older \fBlzjb\fR compression.
+Typically, \fBlz4\fR compression is approximately 50% faster on
+compressible data and 200% faster on incompressible data than
+\fBlzjb\fR. It is also approximately 80% faster on decompression, while
+giving approximately 10% better compression ratio.
+
+When the \fBlz4_compress\fR feature is set to \fBenabled\fR, the
+administrator can turn on \fBlz4\fR compression on any dataset on the
+pool using the \fBzfs\fR(8) command. Please note that doing so will
+immediately activate the \fBlz4_compress\fR feature on the underlying
+pool (even before any data is written). Since this feature is not
+read-only compatible, this operation will render the pool unimportable
+on systems without support for the \fBlz4_compress\fR feature. At the
+moment, this operation cannot be reversed. Booting off of
+\fBlz4\fR-compressed root pools is supported.
+
+.RE
+
 .SH "SEE ALSO"
-\fBzpool\fR(1M)
+\fBzpool\fR(8)