%B

*** 23,32 ****
--- 23,33 ----
  .\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
  .\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
  .\" Copyright (c) 2012 by Delphix. All rights reserved.
  .\" Copyright (c) 2012, Joyent, Inc. All rights reserved.
  .\" Copyright 2012 Nexenta Systems, Inc. All Rights Reserved.
+ .\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  .\"
  .TH ZFS 1M "Sep 16, 2012"
  .SH NAME
  zfs \- configures ZFS file systems
  .SH SYNOPSIS
*** 910,920 ****
  
  .sp
  .ne 2
  .na
  \fB\fBcompression\fR=\fBon\fR | \fBoff\fR | \fBlzjb\fR | \fBgzip\fR |
! \fBgzip-\fR\fIN\fR | \fBzle\fR\fR
  .ad
  .sp .6
  .RS 4n
  Controls the compression algorithm used for this dataset. The \fBlzjb\fR
  compression algorithm is optimized for performance while providing decent data
--- 911,921 ----
  
  .sp
  .ne 2
  .na
  \fB\fBcompression\fR=\fBon\fR | \fBoff\fR | \fBlzjb\fR | \fBgzip\fR |
! \fBgzip-\fR\fIN\fR | \fBzle\fR\fR | \fBlz4\fR | \fBlz4hc\fR
  .ad
  .sp .6
  .RS 4n
  Controls the compression algorithm used for this dataset. The \fBlzjb\fR
  compression algorithm is optimized for performance while providing decent data
*** 924,933 ****
--- 925,945 ----
  value \fBgzip-\fR\fIN\fR where \fIN\fR is an integer from 1 (fastest) to 9
  (best compression ratio). Currently, \fBgzip\fR is equivalent to \fBgzip-6\fR
  (which is also the default for \fBgzip\fR(1)). The \fBzle\fR compression
  algorithm compresses runs of zeros.
  .sp
+ The \fBlz4\fR compression algorithm is a high-performance replacement
+ for the \fBlzjb\fR algorithm. It features significantly faster
+ compression and decompression, as well as a moderately higher
+ compression ratio than \fBlzjb\fR, but can only be used on pools with
+ the \fBlz4_compress\fR feature set to \fIenabled\fR. See
+ \fBzpool-features\fR(5) for details on ZFS feature flags and the
+ \fBlz4_compress\fR feature. The \fBlz4hc\fR algorithm is a
+ high-compression variant of \fBlz4\fR. It provides compression ratios
+ and compression speeds comparable to gzip, but much faster decompression
+ (same as \fBlz4\fR).
+ .sp
  This property can also be referred to by its shortened column name
  \fBcompress\fR. Changing this property affects only newly-written data.
  .RE
  
  .sp