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          --- old/usr/src/man/man1m/zfs.1m
          +++ new/usr/src/man/man1m/zfs.1m
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  18   18  .\" information: Portions Copyright [yyyy] [name of copyright owner]
  19   19  .\"
  20   20  .\" CDDL HEADER END
  21   21  .\"
  22   22  .\"
  23   23  .\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
  24   24  .\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
  25   25  .\" Copyright (c) 2012 by Delphix. All rights reserved.
  26   26  .\" Copyright (c) 2012, Joyent, Inc. All rights reserved.
  27   27  .\" Copyright 2012 Nexenta Systems, Inc. All Rights Reserved.
       28 +.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  28   29  .\"
  29   30  .TH ZFS 1M "Sep 16, 2012"
  30   31  .SH NAME
  31   32  zfs \- configures ZFS file systems
  32   33  .SH SYNOPSIS
  33   34  .LP
  34   35  .nf
  35   36  \fBzfs\fR [\fB-?\fR]
  36   37  .fi
  37   38
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 905  906  disables integrity checking on user data. Disabling checksums is \fBNOT\fR a
 906  907  recommended practice.
 907  908  .sp
 908  909  Changing this property affects only newly-written data.
 909  910  .RE
 910  911  
 911  912  .sp
 912  913  .ne 2
 913  914  .na
 914  915  \fB\fBcompression\fR=\fBon\fR | \fBoff\fR | \fBlzjb\fR | \fBgzip\fR |
 915      -\fBgzip-\fR\fIN\fR | \fBzle\fR\fR
      916 +\fBgzip-\fR\fIN\fR | \fBzle\fR\fR | \fBlz4\fR | \fBlz4hc\fR
 916  917  .ad
 917  918  .sp .6
 918  919  .RS 4n
 919  920  Controls the compression algorithm used for this dataset. The \fBlzjb\fR
 920  921  compression algorithm is optimized for performance while providing decent data
 921  922  compression. Setting compression to \fBon\fR uses the \fBlzjb\fR compression
 922  923  algorithm. The \fBgzip\fR compression algorithm uses the same compression as
 923  924  the \fBgzip\fR(1) command. You can specify the \fBgzip\fR level by using the
 924  925  value \fBgzip-\fR\fIN\fR where \fIN\fR is an integer from 1 (fastest) to 9
 925  926  (best compression ratio). Currently, \fBgzip\fR is equivalent to \fBgzip-6\fR
 926  927  (which is also the default for \fBgzip\fR(1)). The \fBzle\fR compression
 927  928  algorithm compresses runs of zeros.
 928  929  .sp
      930 +The \fBlz4\fR compression algorithm is a high-performance replacement
      931 +for the \fBlzjb\fR algorithm. It features significantly faster
      932 +compression and decompression, as well as a moderately higher
      933 +compression ratio than \fBlzjb\fR, but can only be used on pools with
      934 +the \fBlz4_compress\fR feature set to \fIenabled\fR. See
      935 +\fBzpool-features\fR(5) for details on ZFS feature flags and the
      936 +\fBlz4_compress\fR feature. The \fBlz4hc\fR algorithm is a
      937 +high-compression variant of \fBlz4\fR. It provides compression ratios
      938 +and compression speeds comparable to gzip, but much faster decompression
      939 +(same as \fBlz4\fR).
      940 +.sp
 929  941  This property can also be referred to by its shortened column name
 930  942  \fBcompress\fR. Changing this property affects only newly-written data.
 931  943  .RE
 932  944  
 933  945  .sp
 934  946  .ne 2
 935  947  .na
 936  948  \fB\fBcopies\fR=\fB1\fR | \fB2\fR | \fB3\fR\fR
 937  949  .ad
 938  950  .sp .6
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