From 31bc7e2a6ba0e4e7f9f53779d8536e5b9e0f28e8 Mon Sep 17 00:00:00 2001
From: Jordi Sanfeliu <jordi@fibranet.cat>
Date: Tue, 21 Jul 2015 18:27:09 +0200
Subject: [PATCH] added a complete graph for the ZFS filesystem

---
 Changes                   |   2 +
 lib/zfs.pm                | 934 ++++++++++++++++++++++++++++++++++++++
 man/man5/monitorix.conf.5 |  14 +
 monitorix.conf            |  19 +-
 4 files changed, 968 insertions(+), 1 deletion(-)
 create mode 100644 lib/zfs.pm

diff --git a/Changes b/Changes
index 5b5de2f..01603ce 100644
--- a/Changes
+++ b/Changes
@@ -5,6 +5,8 @@
 - Added a complete graph for the PageSpeed Module.
 	(suggested by Jeroen Kik, monitorix AT steelyard.nl)
 - Added a complete graph for the 'upsc' (Network UPS Tools) command. [#95]
+- Added a complete graph for the ZFS filesystem.
+	(suggested by Kilian Cavalotti, kilian AT stanford.edu and others)
 - Changed the code in Wowza Server graph to treat MessagesInBytesRate and
   MessagesOutBytesRate as gauge values. [#86]
 - Changed to a clickable link the bottom URL in the Apache graph, and fixed the
diff --git a/lib/zfs.pm b/lib/zfs.pm
new file mode 100644
index 0000000..d96f3f5
--- /dev/null
+++ b/lib/zfs.pm
@@ -0,0 +1,934 @@
+#
+# Monitorix - A lightweight system monitoring tool.
+#
+# Copyright (C) 2005-2015 by Jordi Sanfeliu <jordi@fibranet.cat>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+
+package zfs;
+
+use strict;
+use warnings;
+use Monitorix;
+use RRDs;
+use Exporter 'import';
+our @EXPORT = qw(zfs_init zfs_update zfs_cgi);
+
+sub zfs_init {
+	my $myself = (caller(0))[3];
+	my ($package, $config, $debug) = @_;
+	my $rrd = $config->{base_lib} . $package . ".rrd";
+	my $zfs = $config->{zfs};
+
+	my $info;
+	my @ds;
+	my @rra;
+	my @tmp;
+	my $n;
+
+	my @average;
+	my @min;
+	my @max;
+	my @last;
+
+	if(-e $rrd) {
+		$info = RRDs::info($rrd);
+		for my $key (keys %$info) {
+			if(index($key, 'ds[') == 0) {
+				if(index($key, '.type') != -1) {
+					push(@ds, substr($key, 3, index($key, ']') - 3));
+				}
+			}
+			if(index($key, 'rra[') == 0) {
+				if(index($key, '.rows') != -1) {
+					push(@rra, substr($key, 4, index($key, ']') - 4));
+				}
+			}
+		}
+		if((scalar(@ds) - 22) / 10 != $zfs->{max_pools}) {
+			logger("$myself: Detected size mismatch between 'max = $zfs->{max_pools}' and $rrd (" . (scalar(@ds) - 22) / 10 . "). Resizing it accordingly. All historical data will be lost. Backup file created.");
+			rename($rrd, "$rrd.bak");
+		}
+		if(scalar(@rra) < 12 + (4 * $config->{max_historic_years})) {
+			logger("$myself: Detected size mismatch between 'max_historic_years' (" . $config->{max_historic_years} . ") and $rrd (" . ((scalar(@rra) -12) / 4) . "). Resizing it accordingly. All historical data will be lost. Backup file created.");
+			rename($rrd, "$rrd.bak");
+		}
+	}
+
+	if(!(-e $rrd)) {
+		logger("Creating '$rrd' file.");
+		for($n = 1; $n <= $config->{max_historic_years}; $n++) {
+			push(@average, "RRA:AVERAGE:0.5:1440:" . (365 * $n));
+			push(@min, "RRA:MIN:0.5:1440:" . (365 * $n));
+			push(@max, "RRA:MAX:0.5:1440:" . (365 * $n));
+			push(@last, "RRA:LAST:0.5:1440:" . (365 * $n));
+		}
+		for($n = 0; $n < $zfs->{max_pools}; $n++) {
+			push(@tmp, "DS:zfs" . $n . "_free:GAUGE:120:0:U");
+			push(@tmp, "DS:zfs" . $n . "_udata:GAUGE:120:0:U");
+			push(@tmp, "DS:zfs" . $n . "_usnap:GAUGE:120:0:U");
+			push(@tmp, "DS:zfs" . $n . "_cap:GAUGE:120:0:100");
+			push(@tmp, "DS:zfs" . $n . "_fra:GAUGE:120:0:100");
+			push(@tmp, "DS:zfs" . $n . "_val1:GAUGE:120:0:U");
+			push(@tmp, "DS:zfs" . $n . "_val2:GAUGE:120:0:U");
+			push(@tmp, "DS:zfs" . $n . "_val3:GAUGE:120:0:U");
+			push(@tmp, "DS:zfs" . $n . "_val4:GAUGE:120:0:U");
+			push(@tmp, "DS:zfs" . $n . "_val5:GAUGE:120:0:U");
+		}
+		eval {
+			RRDs::create($rrd,
+				"--step=60",
+				"DS:zfs_arcsize:GAUGE:120:0:U",
+				"DS:zfs_cmax:GAUGE:120:0:U",
+				"DS:zfs_cmin:GAUGE:120:0:U",
+				"DS:zfs_arctgtsize:GAUGE:120:0:U",
+				"DS:zfs_metalimit:GAUGE:120:0:U",
+				"DS:zfs_metaused:GAUGE:120:0:U",
+				"DS:zfs_metamax:GAUGE:120:0:U",
+				"DS:zfs_arc_hits:GAUGE:120:0:U",
+				"DS:zfs_arc_misses:GAUGE:120:0:U",
+				"DS:zfs_arc_deleted:GAUGE:120:0:U",
+				"DS:zfs_l2arc_hits:GAUGE:120:0:U",
+				"DS:zfs_l2arc_misses:GAUGE:120:0:U",
+				"DS:zfs_val01:GAUGE:120:0:U",
+				"DS:zfs_val02:GAUGE:120:0:U",
+				"DS:zfs_val03:GAUGE:120:0:U",
+				"DS:zfs_val04:GAUGE:120:0:U",
+				"DS:zfs_val05:GAUGE:120:0:U",
+				"DS:zfs_val06:GAUGE:120:0:U",
+				"DS:zfs_val07:GAUGE:120:0:U",
+				"DS:zfs_val08:GAUGE:120:0:U",
+				"DS:zfs_val09:GAUGE:120:0:U",
+				"DS:zfs_val10:GAUGE:120:0:U",
+				@tmp,
+				"RRA:AVERAGE:0.5:1:1440",
+				"RRA:AVERAGE:0.5:30:336",
+				"RRA:AVERAGE:0.5:60:744",
+				@average,
+				"RRA:MIN:0.5:1:1440",
+				"RRA:MIN:0.5:30:336",
+				"RRA:MIN:0.5:60:744",
+				@min,
+				"RRA:MAX:0.5:1:1440",
+				"RRA:MAX:0.5:30:336",
+				"RRA:MAX:0.5:60:744",
+				@max,
+				"RRA:LAST:0.5:1:1440",
+				"RRA:LAST:0.5:30:336",
+				"RRA:LAST:0.5:60:744",
+				@last,
+			);
+		};
+		my $err = RRDs::error;
+		if($@ || $err) {
+			logger("$@") unless !$@;
+			if($err) {
+				logger("ERROR: while creating $rrd: $err");
+				if($err eq "RRDs::error") {
+					logger("... is the RRDtool Perl package installed?");
+				}
+			}
+			return;
+		}
+	}
+
+	$config->{zfs_hist} = ();
+	push(@{$config->{func_update}}, $package);
+	logger("$myself: Ok") if $debug;
+}
+
+sub zfs_update {
+	my $myself = (caller(0))[3];
+	my ($package, $config, $debug) = @_;
+	my $rrd = $config->{base_lib} . $package . ".rrd";
+	my $zfs = $config->{zfs};
+
+	my $arcsize = 0;
+	my $cmax = 0;
+	my $cmin = 0;
+	my $arctgtsize = 0;
+	my $metalimit = 0;
+	my $metaused = 0;
+	my $metamax = 0;
+	my $archits = 0;
+	my $arcmisses = 0;
+	my $arcdeleted = 0;
+	my $l2arc_hits = 0;
+	my $l2arc_misses = 0;
+	my $val01 = 0;
+	my $val02 = 0;
+	my $val03 = 0;
+	my $val04 = 0;
+	my $val05 = 0;
+	my $val06 = 0;
+	my $val07 = 0;
+	my $val08 = 0;
+	my $val09 = 0;
+	my $val10 = 0;
+
+	my $n;
+	my $rrdata = "N";
+
+	if(open(IN, "/proc/spl/kstat/zfs/arcstats")) {
+		while(<IN>) {
+			if(/^size\s+\d+\s+(\d+)$/) {
+				$arcsize = $1;
+			}
+			if(/^c_max\s+\d+\s+(\d+)$/) {
+				$cmax = $1;
+			}
+			if(/^c_min\s+\d+\s+(\d+)$/) {
+				$cmin = $1;
+			}
+			if(/^c\s+\d+\s+(\d+)$/) {
+				$arctgtsize = $1;
+			}
+			if(/^arc_meta_limit\s+\d+\s+(\d+)$/) {
+				$metalimit = $1;
+			}
+			if(/^arc_meta_used\s+\d+\s+(\d+)$/) {
+				$metaused = $1;
+			}
+			if(/^arc_meta_max\s+\d+\s+(\d+)$/) {
+				$metamax = $1;
+			}
+			if(/^hits\s+\d+\s+(\d+)$/) {
+				$archits = $1 - ($config->{zfs_hist}->{archits} || 0);
+				$archits = 0 unless $archits != $1;
+				$archits /= 60;
+				$config->{zfs_hist}->{archits} = $1;
+			}
+			if(/^misses\s+\d+\s+(\d+)$/) {
+				$arcmisses = $1 - ($config->{zfs_hist}->{arcmisses} || 0);
+				$arcmisses = 0 unless $arcmisses != $1;
+				$arcmisses /= 60;
+				$config->{zfs_hist}->{arcmisses} = $1;
+			}
+			if(/^deleted\s+\d+\s+(\d+)$/) {
+				$arcdeleted = $1 - ($config->{zfs_hist}->{arcdeleted} || 0);
+				$arcdeleted = 0 unless $arcdeleted != $1;
+				$arcdeleted /= 60;
+				$config->{zfs_hist}->{arcdeleted} = $1;
+			}
+			if(/^l2_hits\s+\d+\s+(\d+)$/) {
+				$l2arc_hits = $1 - ($config->{zfs_hist}->{l2arc_hits} || 0);
+				$l2arc_hits = 0 unless $l2arc_hits != $1;
+				$l2arc_hits /= 60;
+				$config->{zfs_hist}->{l2arc_hits} = $1;
+			}
+			if(/^l2_misses\s+\d+\s+(\d+)$/) {
+				$l2arc_misses = $1 - ($config->{zfs_hist}->{l2arc_misses} || 0);
+				$l2arc_misses = 0 unless $l2arc_misses != $1;
+				$l2arc_misses /= 60;
+				$config->{zfs_hist}->{l2arc_misses} = $1;
+			}
+		}
+		close(IN);
+	}
+
+	$rrdata .= ":$arcsize:$cmax:$cmin:$arctgtsize:$metalimit:$metaused:$metamax:$archits:$arcmisses:$arcdeleted:$l2arc_hits:$l2arc_misses:0:0:0:0:0:0:0:0:0:0";
+
+	for($n = 0; $n < $zfs->{max_pools}; $n++) {
+		my $free = 0;
+		my $udata = 0;
+		my $usnap = 0;
+		my $cap = 0;
+		my $fra = 0;
+		my $val1 = 0;
+		my $val2 = 0;
+		my $val3 = 0;
+		my $val4 = 0;
+		my $val5 = 0;
+
+		my $pool = (split(',', $zfs->{list}))[$n] || "";
+		if($pool) {
+			$free = trim(`zfs get -rHp -o value available $pool`);
+			$udata = trim(`zfs get -rHp -o value used $pool`);
+			$usnap = trim(`zfs get -rHp -o value usedbysnapshots $pool`);
+			$cap = trim((split(' ', `zpool list -H $pool` || ""))[6]);
+			$cap =~ s/%//;
+			$fra = trim((split(' ', `zpool list -H $pool` || ""))[5]);
+			$fra =~ s/%//;
+		}
+
+		$rrdata .= ":$free:$udata:$usnap:$cap:$fra:0:0:0:0:0";
+	}
+
+	RRDs::update($rrd, $rrdata);
+	logger("$myself: $rrdata") if $debug;
+	my $err = RRDs::error;
+	logger("ERROR: while updating $rrd: $err") if $err;
+}
+
+sub zfs_cgi {
+	my ($package, $config, $cgi) = @_;
+
+	my $zfs = $config->{zfs};
+	my @rigid = split(',', ($zfs->{rigid} || ""));
+	my @limit = split(',', ($zfs->{limit} || ""));
+	my $tf = $cgi->{tf};
+	my $colors = $cgi->{colors};
+	my $graph = $cgi->{graph};
+	my $silent = $cgi->{silent};
+	my $zoom = "--zoom=" . $config->{global_zoom};
+	my %rrd = (
+		'new' => \&RRDs::graphv,
+		'old' => \&RRDs::graph,
+	);
+	my $version = "new";
+	my $pic;
+	my $picz;
+	my $picz_width;
+	my $picz_height;
+
+	my $u = "";
+	my $width;
+	my $height;
+	my @riglim;
+	my @PNG;
+	my @PNGz;
+	my @tmp;
+	my @tmpz;
+	my @CDEF;
+	my $e;
+	my $n;
+	my $str;
+	my $err;
+
+	$version = "old" if $RRDs::VERSION < 1.3;
+	my $rrd = $config->{base_lib} . $package . ".rrd";
+	my $title = $config->{graph_title}->{$package};
+	my $PNG_DIR = $config->{base_dir} . "/" . $config->{imgs_dir};
+
+	$title = !$silent ? $title : "";
+
+
+	# text mode
+	#
+	if(lc($config->{iface_mode}) eq "text") {
+		if($title) {
+			main::graph_header($title, 2);
+			print("    <tr>\n");
+			print("    <td bgcolor='$colors->{title_bg_color}'>\n");
+		}
+		my (undef, undef, undef, $data) = RRDs::fetch("$rrd",
+			"--start=-$tf->{nwhen}$tf->{twhen}",
+			"AVERAGE",
+			"-r $tf->{res}");
+		$err = RRDs::error;
+		print("ERROR: while fetching $rrd: $err\n") if $err;
+		my $line0;
+		my $line1;
+		my $n2;
+		print("    <pre style='font-size: 12px; color: $colors->{fg_color}';>\n");
+		print("    ");
+		$line0 = "     ARC size       C-Max       C-Min  Targt size  Meta limit   Meta used    Meta max    ARC hits  ARC misses  ARC delete  L2ARC hits  L2ARC miss";
+		$line1 = "-------------------------------------------------------------------------------------------------------------------------------------------------";
+		for($n = 0; $n < scalar(my @zpl = split(',', $zfs->{list})); $n++) {
+			my $p = trim($zpl[$n]);
+			my $i = length($line0);
+			$line0 .= "  Space free   Used Data   Used Snap  Cap  Fra";
+			$line1 .= "----------------------------------------------";
+			$i = length($line0) if(!$n);
+			$i = length($line0) - $i if($n);
+			printf(sprintf("%${i}s", sprintf("Pool: %s", $p)));
+		}
+		print("\n");
+		print("Time$line0\n");
+		print("----$line1 \n");
+		my $line;
+		my @row;
+		my $time;
+		my $from;
+		my $to;
+		for($n = 0, $time = $tf->{tb}; $n < ($tf->{tb} * $tf->{ts}); $n++) {
+			$line = @$data[$n];
+			$time = $time - (1 / $tf->{ts});
+			@row = @$line[0..12];
+			printf(" %2d$tf->{tc}   %10d  %10d  %10d  %10d  %10d  %10d  %10d  %10d  %10d  %10d  %10d  %10d", $time, @row);
+			for($n2 = 0; $n2 < scalar(my @zpl = split(',', $zfs->{list})); $n2++) {
+				$from = 22;
+				$from += $n2 * 10;
+				$to = $from + 5;
+				@row = @$line[$from..$to];
+				printf("  %10d  %10d  %10d %3d%% %3d%%", @row);
+			}
+			print("\n");
+		}
+		print("    </pre>\n");
+		if($title) {
+			print("    </td>\n");
+			print("    </tr>\n");
+			main::graph_footer();
+		}
+		print("  <br>\n");
+		return;
+	}
+
+
+	# graph mode
+	#
+	if($silent eq "yes" || $silent eq "imagetag") {
+		$colors->{fg_color} = "#000000";  # visible color for text mode
+		$u = "_";
+	}
+	if($silent eq "imagetagbig") {
+		$colors->{fg_color} = "#000000";  # visible color for text mode
+		$u = "";
+	}
+
+	my $PNG1 = $u . $package . "1." . $tf->{when} . ".png";
+	my $PNG2 = $u . $package . "2." . $tf->{when} . ".png";
+	my $PNG3 = $u . $package . "3." . $tf->{when} . ".png";
+	my $PNG1z = $u . $package . "1z." . $tf->{when} . ".png";
+	my $PNG2z = $u . $package . "2z." . $tf->{when} . ".png";
+	my $PNG3z = $u . $package . "3z." . $tf->{when} . ".png";
+	unlink ("$PNG_DIR" . "$PNG1",
+		"$PNG_DIR" . "$PNG2",
+		"$PNG_DIR" . "$PNG3");
+	if(lc($config->{enable_zoom}) eq "y") {
+		unlink ("$PNG_DIR" . "$PNG1z",
+			"$PNG_DIR" . "$PNG2z",
+			"$PNG_DIR" . "$PNG3z");
+	}
+	for($n = 0; $n < scalar(my @pl = split(',', $zfs->{list})); $n++) {
+		$str = $u . $package . ($n + 4) . "1." . $tf->{when} . ".png";
+		push(@PNG, $str);
+		unlink("$PNG_DIR" . $str);
+		$str = $u . $package . ($n + 4) . "2." . $tf->{when} . ".png";
+		push(@PNG, $str);
+		unlink("$PNG_DIR" . $str);
+		if(lc($config->{enable_zoom}) eq "y") {
+			$str = $u . $package . ($n + 4) . "1z." . $tf->{when} . ".png";
+			push(@PNGz, $str);
+			unlink("$PNG_DIR" . $str);
+			$str = $u . $package . ($n + 4) . "2z." . $tf->{when} . ".png";
+			push(@PNGz, $str);
+			unlink("$PNG_DIR" . $str);
+		}
+	}
+
+	if($title) {
+		main::graph_header($title, 2);
+	}
+	@riglim = @{setup_riglim($rigid[0], $limit[0])};
+	if($title) {
+		print("    <tr>\n");
+		print("    <td bgcolor='$colors->{title_bg_color}'>\n");
+	}
+	push(@tmp, "LINE2:arcsize#44EE44:ARC size");
+	push(@tmp, "GPRINT:arcsize:LAST:          Cur\\: %4.1lf%s");
+	push(@tmp, "GPRINT:arcsize:AVERAGE:    Avg\\: %4.1lf%s");
+	push(@tmp, "GPRINT:arcsize:MIN:    Min\\: %4.1lf%s");
+	push(@tmp, "GPRINT:arcsize:MAX:    Max\\: %4.1lf%s\\n");
+	push(@tmpz, "LINE2:arcsize#44EE44:ARC size");
+	push(@tmp, "LINE2:cmax#EE4444:Maximum ARC size");
+	push(@tmp, "GPRINT:cmax:LAST:  Cur\\: %4.1lf%s");
+	push(@tmp, "GPRINT:cmax:AVERAGE:    Avg\\: %4.1lf%s");
+	push(@tmp, "GPRINT:cmax:MIN:    Min\\: %4.1lf%s");
+	push(@tmp, "GPRINT:cmax:MAX:    Max\\: %4.1lf%s\\n");
+	push(@tmpz, "LINE2:cmax#EE4444:Maximum ARC size");
+	push(@tmp, "LINE2:cmin#EE4444:Minimum ARC size");
+	push(@tmp, "GPRINT:cmin:LAST:  Cur\\: %4.1lf%s");
+	push(@tmp, "GPRINT:cmin:AVERAGE:    Avg\\: %4.1lf%s");
+	push(@tmp, "GPRINT:cmin:MIN:    Min\\: %4.1lf%s");
+	push(@tmp, "GPRINT:cmin:MAX:    Max\\: %4.1lf%s\\n");
+	push(@tmpz, "LINE2:cmin#EE4444:Minimum ARC size");
+	push(@tmp, "LINE2:c#EEEE44:ARC target size");
+	push(@tmp, "GPRINT:c:LAST:   Cur\\: %4.1lf%s");
+	push(@tmp, "GPRINT:c:AVERAGE:    Avg\\: %4.1lf%s");
+	push(@tmp, "GPRINT:c:MIN:    Min\\: %4.1lf%s");
+	push(@tmp, "GPRINT:c:MAX:    Max\\: %4.1lf%s\\n");
+	push(@tmpz, "LINE2:c#EEEE44:ARC target size");
+	push(@tmp, "LINE2:limit#EE44EE:ARC meta limit");
+	push(@tmp, "GPRINT:limit:LAST:    Cur\\: %4.1lf%s");
+	push(@tmp, "GPRINT:limit:AVERAGE:    Avg\\: %4.1lf%s");
+	push(@tmp, "GPRINT:limit:MIN:    Min\\: %4.1lf%s");
+	push(@tmp, "GPRINT:limit:MAX:    Max\\: %4.1lf%s\\n");
+	push(@tmpz, "LINE2:limit#EE44EE:ARC meta limit");
+	push(@tmp, "LINE2:max#4444EE:ARC meta max");
+	push(@tmp, "GPRINT:max:LAST:      Cur\\: %4.1lf%s");
+	push(@tmp, "GPRINT:max:AVERAGE:    Avg\\: %4.1lf%s");
+	push(@tmp, "GPRINT:max:MIN:    Min\\: %4.1lf%s");
+	push(@tmp, "GPRINT:max:MAX:    Max\\: %4.1lf%s\\n");
+	push(@tmpz, "LINE2:max#4444EE:ARC meta max");
+	push(@tmp, "LINE2:used#44EEEE:ARC meta used");
+	push(@tmp, "GPRINT:used:LAST:     Cur\\: %4.1lf%s");
+	push(@tmp, "GPRINT:used:AVERAGE:    Avg\\: %4.1lf%s");
+	push(@tmp, "GPRINT:used:MIN:    Min\\: %4.1lf%s");
+	push(@tmp, "GPRINT:used:MAX:    Max\\: %4.1lf%s\\n");
+	push(@tmpz, "LINE2:used#44EEEE:ARC meta used");
+	if(lc($config->{show_gaps}) eq "y") {
+		push(@tmp, "AREA:wrongdata#$colors->{gap}:");
+		push(@tmpz, "AREA:wrongdata#$colors->{gap}:");
+		push(@CDEF, "CDEF:wrongdata=allvalues,UN,INF,UNKN,IF");
+	}
+	($width, $height) = split('x', $config->{graph_size}->{main});
+	if($silent =~ /imagetag/) {
+		($width, $height) = split('x', $config->{graph_size}->{remote}) if $silent eq "imagetag";
+		($width, $height) = split('x', $config->{graph_size}->{main}) if $silent eq "imagetagbig";
+		@tmp = @tmpz;
+	}
+	$pic = $rrd{$version}->("$PNG_DIR" . "$PNG1",
+		"--title=$config->{graphs}->{_zfs1}  ($tf->{nwhen}$tf->{twhen})",
+		"--start=-$tf->{nwhen}$tf->{twhen}",
+		"--imgformat=PNG",
+		"--vertical-label=bytes",
+		"--width=$width",
+		"--height=$height",
+		@riglim,
+		$zoom,
+		@{$cgi->{version12}},
+		@{$colors->{graph_colors}},
+		"DEF:arcsize=$rrd:zfs_arcsize:AVERAGE",
+		"DEF:cmax=$rrd:zfs_cmax:AVERAGE",
+		"DEF:cmin=$rrd:zfs_cmin:AVERAGE",
+		"DEF:c=$rrd:zfs_arctgtsize:AVERAGE",
+		"DEF:limit=$rrd:zfs_metalimit:AVERAGE",
+		"DEF:max=$rrd:zfs_metamax:AVERAGE",
+		"DEF:used=$rrd:zfs_metaused:AVERAGE",
+		"CDEF:allvalues=arcsize,cmax,cmin,c,limit,max,used,+,+,+,+,+,+",
+		@CDEF,
+		"COMMENT: \\n",
+		@tmp);
+	$err = RRDs::error;
+	print("ERROR: while graphing $PNG_DIR" . "$PNG1: $err\n") if $err;
+	if(lc($config->{enable_zoom}) eq "y") {
+		($width, $height) = split('x', $config->{graph_size}->{zoom});
+		$picz = $rrd{$version}->("$PNG_DIR" . "$PNG1z",
+			"--title=$config->{graphs}->{_zfs1}  ($tf->{nwhen}$tf->{twhen})",
+			"--start=-$tf->{nwhen}$tf->{twhen}",
+			"--imgformat=PNG",
+			"--vertical-label=bytes",
+			"--width=$width",
+			"--height=$height",
+			@riglim,
+			$zoom,
+			@{$cgi->{version12}},
+			@{$colors->{graph_colors}},
+			"DEF:arcsize=$rrd:zfs_arcsize:AVERAGE",
+			"DEF:cmax=$rrd:zfs_cmax:AVERAGE",
+			"DEF:cmin=$rrd:zfs_cmin:AVERAGE",
+			"DEF:c=$rrd:zfs_arctgtsize:AVERAGE",
+			"DEF:limit=$rrd:zfs_metalimit:AVERAGE",
+			"DEF:max=$rrd:zfs_metamax:AVERAGE",
+			"DEF:used=$rrd:zfs_metaused:AVERAGE",
+			"CDEF:allvalues=arcsize,cmax,cmin,c,limit,max,used,+,+,+,+,+,+",
+			@CDEF,
+			@tmpz);
+		$err = RRDs::error;
+		print("ERROR: while graphing $PNG_DIR" . "$PNG1z: $err\n") if $err;
+	}
+	if($title || ($silent =~ /imagetag/ && $graph =~ /zfs1/)) {
+		if(lc($config->{enable_zoom}) eq "y") {
+			if(lc($config->{disable_javascript_void}) eq "y") {
+				print("      <a href=\"" . $config->{url} . "/" . $config->{imgs_dir} . $PNG1z . "\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG1 . "' border='0'></a>\n");
+			} else {
+				if($version eq "new") {
+					$picz_width = $picz->{image_width} * $config->{global_zoom};
+					$picz_height = $picz->{image_height} * $config->{global_zoom};
+				} else {
+					$picz_width = $width + 115;
+					$picz_height = $height + 100;
+				}
+				print("      <a href=\"javascript:void(window.open('" . $config->{url} . "/" . $config->{imgs_dir} . $PNG1z . "','','width=" . $picz_width . ",height=" . $picz_height . ",scrollbars=0,resizable=0'))\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG1 . "' border='0'></a>\n");
+			}
+		} else {
+			print("      <img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG1 . "'>\n");
+		}
+	}
+
+	if($title) {
+		print("    </td>\n");
+		print("    <td valign='top' bgcolor='" . $colors->{title_bg_color} . "'>\n");
+	}
+	@riglim = @{setup_riglim($rigid[1], $limit[1])};
+	undef(@tmp);
+	undef(@tmpz);
+	undef(@CDEF);
+	push(@tmp, "LINE2:hits#44EEEE:Hits");
+	push(@tmp, "GPRINT:hits:LAST:                 Current\\: %4.0lf\\n");
+	push(@tmp, "LINE2:miss#EE44EE:Misses");
+	push(@tmp, "GPRINT:miss:LAST:               Current\\: %4.0lf\\n");
+	push(@tmp, "LINE2:dele#EEEE44:Deleted");
+	push(@tmp, "GPRINT:dele:LAST:              Current\\: %4.0lf\\n");
+	push(@tmpz, "LINE2:hits#44EEEE:Hits");
+	push(@tmpz, "LINE2:miss#EE44EE:Misses");
+	push(@tmpz, "LINE2:dele#EEEE44:Deleted");
+	if(lc($config->{show_gaps}) eq "y") {
+		push(@tmp, "AREA:wrongdata#$colors->{gap}:");
+		push(@tmpz, "AREA:wrongdata#$colors->{gap}:");
+		push(@CDEF, "CDEF:wrongdata=allvalues,UN,INF,UNKN,IF");
+	}
+	($width, $height) = split('x', $config->{graph_size}->{small});
+	if($silent =~ /imagetag/) {
+		($width, $height) = split('x', $config->{graph_size}->{remote}) if $silent eq "imagetag";
+		($width, $height) = split('x', $config->{graph_size}->{main}) if $silent eq "imagetagbig";
+		@tmp = @tmpz;
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+	}
+	$pic = $rrd{$version}->("$PNG_DIR" . "$PNG2",
+		"--title=$config->{graphs}->{_zfs2}  ($tf->{nwhen}$tf->{twhen})",
+		"--start=-$tf->{nwhen}$tf->{twhen}",
+		"--imgformat=PNG",
+		"--vertical-label=Reads/s",
+		"--width=$width",
+		"--height=$height",
+		@riglim,
+		$zoom,
+		@{$cgi->{version12}},
+		@{$cgi->{version12_small}},
+		@{$colors->{graph_colors}},
+		"DEF:hits=$rrd:zfs_arc_hits:AVERAGE",
+		"DEF:miss=$rrd:zfs_arc_misses:AVERAGE",
+		"DEF:dele=$rrd:zfs_arc_deleted:AVERAGE",
+		"CDEF:allvalues=hits,miss,dele,+,+",
+		@CDEF,
+		@tmp);
+	$err = RRDs::error;
+	print("ERROR: while graphing $PNG_DIR" . "$PNG2: $err\n") if $err;
+	if(lc($config->{enable_zoom}) eq "y") {
+		($width, $height) = split('x', $config->{graph_size}->{zoom});
+		$picz = $rrd{$version}->("$PNG_DIR" . "$PNG2z",
+			"--title=$config->{graphs}->{_zfs2}  ($tf->{nwhen}$tf->{twhen})",
+			"--start=-$tf->{nwhen}$tf->{twhen}",
+			"--imgformat=PNG",
+			"--vertical-label=Reads/s",
+			"--width=$width",
+			"--height=$height",
+			@riglim,
+			$zoom,
+			@{$cgi->{version12}},
+			@{$cgi->{version12_small}},
+			@{$colors->{graph_colors}},
+			"DEF:hits=$rrd:zfs_arc_hits:AVERAGE",
+			"DEF:miss=$rrd:zfs_arc_misses:AVERAGE",
+			"DEF:dele=$rrd:zfs_arc_deleted:AVERAGE",
+			"CDEF:allvalues=hits,miss,dele,+,+",
+			@CDEF,
+			@tmpz);
+		$err = RRDs::error;
+		print("ERROR: while graphing $PNG_DIR" . "$PNG2z: $err\n") if $err;
+	}
+	if($title || ($silent =~ /imagetag/ && $graph =~ /zfs2/)) {
+		if(lc($config->{enable_zoom}) eq "y") {
+			if(lc($config->{disable_javascript_void}) eq "y") {
+				print("      <a href=\"" . $config->{url} . "/" . $config->{imgs_dir} . $PNG2z . "\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG2 . "' border='0'></a>\n");
+			} else {
+				if($version eq "new") {
+					$picz_width = $picz->{image_width} * $config->{global_zoom};
+					$picz_height = $picz->{image_height} * $config->{global_zoom};
+				} else {
+					$picz_width = $width + 115;
+					$picz_height = $height + 100;
+				}
+				print("      <a href=\"javascript:void(window.open('" . $config->{url} . "/" . $config->{imgs_dir} . $PNG2z . "','','width=" . $picz_width . ",height=" . $picz_height . ",scrollbars=0,resizable=0'))\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG2 . "' border='0'></a>\n");
+			}
+		} else {
+			print("      <img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG2 . "'>\n");
+		}
+	}
+
+	@riglim = @{setup_riglim($rigid[2], $limit[2])};
+	undef(@tmp);
+	undef(@tmpz);
+	undef(@CDEF);
+	push(@tmp, "LINE2:hits#44EEEE:Hits");
+	push(@tmp, "GPRINT:hits:LAST:                 Current\\: %4.0lf\\n");
+	push(@tmp, "LINE2:miss#EE44EE:Misses");
+	push(@tmp, "GPRINT:miss:LAST:               Current\\: %4.0lf\\n");
+	push(@tmpz, "LINE2:hits#44EEEE:Hits");
+	push(@tmpz, "LINE2:miss#EE44EE:Misses");
+	if(lc($config->{show_gaps}) eq "y") {
+		push(@tmp, "AREA:wrongdata#$colors->{gap}:");
+		push(@tmpz, "AREA:wrongdata#$colors->{gap}:");
+		push(@CDEF, "CDEF:wrongdata=allvalues,UN,INF,UNKN,IF");
+	}
+	($width, $height) = split('x', $config->{graph_size}->{small});
+	if($silent =~ /imagetag/) {
+		($width, $height) = split('x', $config->{graph_size}->{remote}) if $silent eq "imagetag";
+		($width, $height) = split('x', $config->{graph_size}->{main}) if $silent eq "imagetagbig";
+		@tmp = @tmpz;
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+	}
+	$pic = $rrd{$version}->("$PNG_DIR" . "$PNG3",
+		"--title=$config->{graphs}->{_zfs3}  ($tf->{nwhen}$tf->{twhen})",
+		"--start=-$tf->{nwhen}$tf->{twhen}",
+		"--imgformat=PNG",
+		"--vertical-label=Reads/s",
+		"--width=$width",
+		"--height=$height",
+		@riglim,
+		$zoom,
+		@{$cgi->{version12}},
+		@{$cgi->{version12_small}},
+		@{$colors->{graph_colors}},
+		"DEF:hits=$rrd:zfs_l2arc_hits:AVERAGE",
+		"DEF:miss=$rrd:zfs_l2arc_misses:AVERAGE",
+		"CDEF:allvalues=hits,miss,+",
+		@CDEF,
+		@tmp);
+	$err = RRDs::error;
+	print("ERROR: while graphing $PNG_DIR" . "$PNG3: $err\n") if $err;
+	if(lc($config->{enable_zoom}) eq "y") {
+		($width, $height) = split('x', $config->{graph_size}->{zoom});
+		$picz = $rrd{$version}->("$PNG_DIR" . "$PNG3z",
+			"--title=$config->{graphs}->{_zfs3}  ($tf->{nwhen}$tf->{twhen})",
+			"--start=-$tf->{nwhen}$tf->{twhen}",
+			"--imgformat=PNG",
+			"--vertical-label=Reads/s",
+			"--width=$width",
+			"--height=$height",
+			@riglim,
+			$zoom,
+			@{$cgi->{version12}},
+			@{$cgi->{version12_small}},
+			@{$colors->{graph_colors}},
+			"DEF:hits=$rrd:zfs_l2arc_hits:AVERAGE",
+			"DEF:miss=$rrd:zfs_l2arc_misses:AVERAGE",
+			"CDEF:allvalues=hits,miss,+",
+			@CDEF,
+			@tmpz);
+		$err = RRDs::error;
+		print("ERROR: while graphing $PNG_DIR" . "$PNG3z: $err\n") if $err;
+	}
+	if($title || ($silent =~ /imagetag/ && $graph =~ /zfs3/)) {
+		if(lc($config->{enable_zoom}) eq "y") {
+			if(lc($config->{disable_javascript_void}) eq "y") {
+				print("      <a href=\"" . $config->{url} . "/" . $config->{imgs_dir} . $PNG3z . "\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG3 . "' border='0'></a>\n");
+			} else {
+				if($version eq "new") {
+					$picz_width = $picz->{image_width} * $config->{global_zoom};
+					$picz_height = $picz->{image_height} * $config->{global_zoom};
+				} else {
+					$picz_width = $width + 115;
+					$picz_height = $height + 100;
+				}
+				print("      <a href=\"javascript:void(window.open('" . $config->{url} . "/" . $config->{imgs_dir} . $PNG3z . "','','width=" . $picz_width . ",height=" . $picz_height . ",scrollbars=0,resizable=0'))\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG3 . "' border='0'></a>\n");
+			}
+		} else {
+			print("      <img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG3 . "'>\n");
+		}
+	}
+
+	if($title) {
+		print("  </table>\n");
+		print("  <table cellspacing='5' cellpadding='0' width='1' bgcolor='$colors->{graph_bg_color}' border='1'>\n");
+	}
+
+	$e = 0;
+	for($n = 0; $n < scalar(my @pl = split(',', $zfs->{list})); $n++) {
+		$str = trim($pl[$n]);
+
+	if($title) {
+		print("    <tr>\n");
+		print("    <td bgcolor='" . $colors->{title_bg_color} . "'>\n");
+	}
+	@riglim = @{setup_riglim($rigid[$e + 3], $limit[$e + 3])};
+	undef(@tmp);
+	undef(@tmpz);
+	undef(@CDEF);
+	push(@tmp, "LINE2:udata#44EEEE:Used by data");
+	push(@tmp, "GPRINT:udata:LAST:                 Current\\: %5.1lf%S\\n");
+	push(@tmp, "LINE2:usnap#EE44EE:Used by snapshots");
+	push(@tmp, "GPRINT:usnap:LAST:            Current\\: %5.1lf%S\\n");
+	push(@tmpz, "LINE2:udata#44EEEE:Used by data");
+	push(@tmpz, "LINE2:usnap#EE44EE:Used by snapshots");
+	if(lc($config->{show_gaps}) eq "y") {
+		push(@tmp, "AREA:wrongdata#$colors->{gap}:");
+		push(@tmpz, "AREA:wrongdata#$colors->{gap}:");
+		push(@CDEF, "CDEF:wrongdata=allvalues,UN,INF,UNKN,IF");
+	}
+	($width, $height) = split('x', $config->{graph_size}->{medium2});
+	if($silent =~ /imagetag/) {
+		($width, $height) = split('x', $config->{graph_size}->{remote}) if $silent eq "imagetag";
+		($width, $height) = split('x', $config->{graph_size}->{main}) if $silent eq "imagetagbig";
+		@tmp = @tmpz;
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+	}
+	$pic = $rrd{$version}->("$PNG_DIR" . "$PNG[$e]",
+		"--title=$config->{graphs}->{_zfs4}: $str  ($tf->{nwhen}$tf->{twhen})",
+		"--start=-$tf->{nwhen}$tf->{twhen}",
+		"--imgformat=PNG",
+		"--vertical-label=bytes",
+		"--width=$width",
+		"--height=$height",
+		@riglim,
+		$zoom,
+		@{$cgi->{version12}},
+		@{$cgi->{version12_small}},
+		@{$colors->{graph_colors}},
+		"DEF:free=$rrd:zfs" . $n . "_free:AVERAGE",
+		"DEF:udata=$rrd:zfs" . $n . "_udata:AVERAGE",
+		"DEF:usnap=$rrd:zfs" . $n . "_usnap:AVERAGE",
+		"CDEF:allvalues=free,udata,usnap,+,+",
+		@CDEF,
+		@tmp);
+	$err = RRDs::error;
+	print("ERROR: while graphing $PNG_DIR" . "$PNG[$e]: $err\n") if $err;
+	if(lc($config->{enable_zoom}) eq "y") {
+		($width, $height) = split('x', $config->{graph_size}->{zoom});
+		$picz = $rrd{$version}->("$PNG_DIR" . "$PNGz[$e]",
+			"--title=$config->{graphs}->{_zfs4}: $str  ($tf->{nwhen}$tf->{twhen})",
+			"--start=-$tf->{nwhen}$tf->{twhen}",
+			"--imgformat=PNG",
+			"--vertical-label=bytes",
+			"--width=$width",
+			"--height=$height",
+			@riglim,
+			$zoom,
+			@{$cgi->{version12}},
+			@{$cgi->{version12_small}},
+			@{$colors->{graph_colors}},
+			"DEF:free=$rrd:zfs" . $n . "_free:AVERAGE",
+			"DEF:udata=$rrd:zfs" . $n . "_udata:AVERAGE",
+			"DEF:usnap=$rrd:zfs" . $n . "_usnap:AVERAGE",
+			"CDEF:allvalues=free,udata,usnap,+,+",
+			@CDEF,
+			@tmpz);
+		$err = RRDs::error;
+		print("ERROR: while graphing $PNG_DIR" . "$PNGz[$e]: $err\n") if $err;
+	}
+	if($title || ($silent =~ /imagetag/ && $graph =~ /zfs2/)) {
+		if(lc($config->{enable_zoom}) eq "y") {
+			if(lc($config->{disable_javascript_void}) eq "y") {
+				print("      <a href=\"" . $config->{url} . "/" . $config->{imgs_dir} . $PNGz[$e] . "\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG[$e] . "' border='0'></a>\n");
+			} else {
+				if($version eq "new") {
+					$picz_width = $picz->{image_width} * $config->{global_zoom};
+					$picz_height = $picz->{image_height} * $config->{global_zoom};
+				} else {
+					$picz_width = $width + 115;
+					$picz_height = $height + 100;
+				}
+				print("      <a href=\"javascript:void(window.open('" . $config->{url} . "/" . $config->{imgs_dir} . $PNGz[$e] . "','','width=" . $picz_width . ",height=" . $picz_height . ",scrollbars=0,resizable=0'))\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG[$e] . "' border='0'></a>\n");
+			}
+		} else {
+			print("      <img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG[$e] . "'>\n");
+		}
+	}
+	$e++;
+
+	if($title) {
+		print("    </td>\n");
+		print("    <td bgcolor='" . $colors->{title_bg_color} . "'>\n");
+	}
+	@riglim = @{setup_riglim($rigid[$e + 3], $limit[$e + 3])};
+	undef(@tmp);
+	undef(@tmpz);
+	undef(@CDEF);
+	push(@tmp, "LINE2:cap#44EEEE:Capacity");
+	push(@tmp, "GPRINT:cap:LAST:                     Current\\: %4.1lf%%\\n");
+	push(@tmp, "LINE2:fra#EE44EE:Fragmentation");
+	push(@tmp, "GPRINT:fra:LAST:                Current\\: %4.1lf%%\\n");
+	push(@tmpz, "LINE2:cap#44EEEE:Capacity");
+	push(@tmpz, "LINE2:fra#EE44EE:Fragmentation");
+	if(lc($config->{show_gaps}) eq "y") {
+		push(@tmp, "AREA:wrongdata#$colors->{gap}:");
+		push(@tmpz, "AREA:wrongdata#$colors->{gap}:");
+		push(@CDEF, "CDEF:wrongdata=allvalues,UN,INF,UNKN,IF");
+	}
+	($width, $height) = split('x', $config->{graph_size}->{medium2});
+	if($silent =~ /imagetag/) {
+		($width, $height) = split('x', $config->{graph_size}->{remote}) if $silent eq "imagetag";
+		($width, $height) = split('x', $config->{graph_size}->{main}) if $silent eq "imagetagbig";
+		@tmp = @tmpz;
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+		push(@tmp, "COMMENT: \\n");
+	}
+	$pic = $rrd{$version}->("$PNG_DIR" . "$PNG[$e]",
+		"--title=$config->{graphs}->{_zfs5}: $str  ($tf->{nwhen}$tf->{twhen})",
+		"--start=-$tf->{nwhen}$tf->{twhen}",
+		"--imgformat=PNG",
+		"--vertical-label=Percent (%)",
+		"--width=$width",
+		"--height=$height",
+		@riglim,
+		$zoom,
+		@{$cgi->{version12}},
+		@{$cgi->{version12_small}},
+		@{$colors->{graph_colors}},
+		"DEF:cap=$rrd:zfs" . $n . "_cap:AVERAGE",
+		"DEF:fra=$rrd:zfs" . $n . "_fra:AVERAGE",
+		"CDEF:allvalues=cap,fra,+",
+		@CDEF,
+		@tmp);
+	$err = RRDs::error;
+	print("ERROR: while graphing $PNG_DIR" . "$PNG[$e]: $err\n") if $err;
+	if(lc($config->{enable_zoom}) eq "y") {
+		($width, $height) = split('x', $config->{graph_size}->{zoom});
+		$picz = $rrd{$version}->("$PNG_DIR" . "$PNGz[$e]",
+			"--title=$config->{graphs}->{_zfs5}: $str  ($tf->{nwhen}$tf->{twhen})",
+			"--start=-$tf->{nwhen}$tf->{twhen}",
+			"--imgformat=PNG",
+			"--vertical-label=Percent (%)",
+			"--width=$width",
+			"--height=$height",
+			@riglim,
+			$zoom,
+			@{$cgi->{version12}},
+			@{$cgi->{version12_small}},
+			@{$colors->{graph_colors}},
+			"DEF:cap=$rrd:zfs" . $n . "_cap:AVERAGE",
+			"DEF:fra=$rrd:zfs" . $n . "_fra:AVERAGE",
+			"CDEF:allvalues=cap,fra,+",
+			@CDEF,
+			@tmpz);
+		$err = RRDs::error;
+		print("ERROR: while graphing $PNG_DIR" . "$PNGz[$e]: $err\n") if $err;
+	}
+	if($title || ($silent =~ /imagetag/ && $graph =~ /zfs3/)) {
+		if(lc($config->{enable_zoom}) eq "y") {
+			if(lc($config->{disable_javascript_void}) eq "y") {
+				print("      <a href=\"" . $config->{url} . "/" . $config->{imgs_dir} . $PNGz[$e] . "\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG[$e] . "' border='0'></a>\n");
+			} else {
+				if($version eq "new") {
+					$picz_width = $picz->{image_width} * $config->{global_zoom};
+					$picz_height = $picz->{image_height} * $config->{global_zoom};
+				} else {
+					$picz_width = $width + 115;
+					$picz_height = $height + 100;
+				}
+				print("      <a href=\"javascript:void(window.open('" . $config->{url} . "/" . $config->{imgs_dir} . $PNGz[$e] . "','','width=" . $picz_width . ",height=" . $picz_height . ",scrollbars=0,resizable=0'))\"><img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG[$e] . "' border='0'></a>\n");
+			}
+		} else {
+			print("      <img src='" . $config->{url} . "/" . $config->{imgs_dir} . $PNG[$e] . "'>\n");
+		}
+	}
+	$e++;
+
+	if($title) {
+		print("    </td>\n");
+		print("    </tr>\n");
+	}
+
+	}
+
+	if($title) {
+		main::graph_footer();
+	}
+	print("  <br>\n");
+	return;
+}
+
+1;
diff --git a/man/man5/monitorix.conf.5 b/man/man5/monitorix.conf.5
index ab185c8..cee187a 100644
--- a/man/man5/monitorix.conf.5
+++ b/man/man5/monitorix.conf.5
@@ -978,6 +978,20 @@ The external script will receive the following arguments:
 3rd - the filesystem disk usage.
 .P
 .RE
+.SS ZFS statistics (zfs.rrd)
+This graph is able to monitor an unlimited number of pools.
+.P
+.BI max_pools
+.RS
+This is the maximum number of pools that you can define in \fBlist\fP. There is no limit to the number of pools monitored, but keep in mind that every time this number changes, Monitorix will resize the \fIzfs.rrd\fP file accordingly, removing all historical data.
+.P
+Default value: \fI5\fP
+.P
+.RE
+.BI list
+.RS
+This is a comma-separated list of pool names. The number of pool names defined here can't be greater than the number defined in \fBmax_pools\fP.
+.RE
 .SS Directory usage statistics (du.rrd)
 This graph is able to monitor the usage of an unlimited number of directories.
 .P
diff --git a/monitorix.conf b/monitorix.conf
index b508f9f..d519d4a 100644
--- a/monitorix.conf
+++ b/monitorix.conf
@@ -79,6 +79,7 @@ secure_log_date_format = %b %e
 	nvidia		= n
 	disk		= n
 	fs		= y
+	zfs		= n
 	du		= n
 	net		= y
 	netstat		= y
@@ -236,6 +237,16 @@ secure_log_date_format = %b %e
 </fs>
 
 
+# ZFS graph
+# -----------------------------------------------------------------------------
+<zfs>
+	max_pools = 5
+	list = pool1, pool2
+	rigid = 0, 0, 0, 0, 2, 0, 2
+	limit = 1000, 1000, 1000, 1000, 100, 1000, 100
+</zfs>
+
+
 # DU graph
 # -----------------------------------------------------------------------------
 <du>
@@ -745,7 +756,7 @@ logo_bottom = logo_bot.png
 	remote	= 300x100
 </graph_size>
 
-graph_name = system, kern, proc, hptemp, lmsens, nvidia, disk, fs, du, net, netstat, libvirt, process, serv, mail, port, user, ftp, apache, nginx, lighttpd, mysql, varnish, pagespeed, squid, nfss, nfsc, bind, ntp, fail2ban, icecast, raspberrypi, phpapc, memcached, apcupsd, nut, wowza, int, verlihub
+graph_name = system, kern, proc, hptemp, lmsens, nvidia, disk, fs, zfs, du, net, netstat, libvirt, process, serv, mail, port, user, ftp, apache, nginx, lighttpd, mysql, varnish, pagespeed, squid, nfss, nfsc, bind, ntp, fail2ban, icecast, raspberrypi, phpapc, memcached, apcupsd, nut, wowza, int, verlihub
 
 <graph_title>
 	system		= System load average and usage
@@ -756,6 +767,7 @@ graph_name = system, kern, proc, hptemp, lmsens, nvidia, disk, fs, du, net, nets
 	nvidia		= NVIDIA temperatures and usage
 	disk		= Disk drive temperatures and health
 	fs		= Filesystem usage and I/O activity
+	zfs		= ZFS statistics
 	du		= Directory usage
 	net		= Network traffic and usage
 	netstat		= Netstat statistics
@@ -815,6 +827,11 @@ graph_name = system, kern, proc, hptemp, lmsens, nvidia, disk, fs, du, net, nets
 	_fs2		= Disk I/O activity
 	_fs3		= Inode usage
 	_fs4		= Time spent in I/O activity
+	_zfs1		= ARC usage
+	_zfs2		= ARC cache
+	_zfs3		= L2ARC cache
+	_zfs4		= Pool data usage
+	_zfs5		= Pool usage
 	_du		= Directory usage
 	_net1		= Network traffic
 	_net2		= Network packets