/usr/share/munin/plugins/iostat is in munin-plugins-extra 2.0.6-4+deb7u2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | #!/usr/bin/perl -w
# -*- cperl -*-
=head1 NAME
iostat - Munin plugin to monitor io-bound traffic (in blocks) on disks
=head1 APPLICABLE SYSTEMS
Linux systems.
=head1 CONFIGURATION
The plugin detects block devices from /proc/diskstat or /proc/stat.
By default it will only show un-numbered devices such as sda and not
sda0. By setting
[iostat]
env.SHOW_NUMBERED 1
it will show numbered devices. This is sometimes needed in
virtualized environments (e.g. Xen) where sda1 to sda<n> exists but
not sda. In a virtualized environment this is usefull to show which
guest OS/dom-U IO-traffic originates in.
=head1 USAGE
Link this plugin to /etc/munin/plugins/ and restart the munin-node.
=head1 INTERPRETATION
To be written...
=head1 MAGIC MARKERS
#%# family=legacy
#%# capabilities=autoconf
=head1 VERSION
$Id$
=head1 AUTHOR
This plugin has been in Munin since it was called "LRRD". The log for
this file shows that there was a rewrite by Mike Fedyk applied in
January 2004. We have no other records of who wrote it.
=head1 LICENSE
GPLv2
=cut
use strict;
use Munin::Plugin;
my $detailed_present = 0;
my $stat_present = 0;
my $include_numbered = 0; # By default we want sda but not sda1
if (defined $ENV{'SHOW_NUMBERED'}) {
$include_numbered = $ENV{'SHOW_NUMBERED'};
};
if (system("grep -q '' /proc/diskstats > /dev/null 2>&1") == 0 ||
system("grep -q 'rio rmerge rsect ruse wio wmerge wsect wuse running use aveq' /proc/partitions > /dev/null 2>&1") == 0) {
$detailed_present = 1;
} elsif (system("grep -q '^disk_io: [^ ]' /proc/stat") == 0) {
$stat_present = 1;
}
if ( $ARGV[0] and $ARGV[0] eq "autoconf") {
if ($detailed_present eq 1 || $stat_present eq 1) {
print "yes\n";
exit 0;
}
print "no\n";
exit 0;
}
my %devs;
if ($detailed_present eq 1) {
&fetch_detailed;
} elsif ($stat_present eq 1) {
# Falling back to /proc/stat
&fetch_stat;
}
if ( $ARGV[0] and $ARGV[0] eq "config") {
print "graph_title IOstat\n";
print "graph_args --base 1024 -l 0\n";
print "graph_vlabel blocks per \${graph_period} read (-) / written (+)\n";
print "graph_category disk\n";
print "graph_total Total\n" if (keys (%devs) > 1);
print "graph_info This graph shows the I/O to and from block devices.\n";
print "graph_order";
foreach my $key (sort by_dev keys %devs) {
print " ", $key, "_read ", $key, "_write ";
}
print "\n";
foreach my $key (sort by_dev keys %devs) {
print $key . "_read.label $devs{$key}->{name}\n";
print $key . "_read.type DERIVE\n";
print $key . "_read.min 0\n";
print $key . "_read.graph no\n";
print $key . "_write.label $devs{$key}->{name}\n";
print $key . "_write.info I/O on device $devs{$key}->{name}\n";
print $key . "_write.type DERIVE\n";
print $key . "_write.min 0\n";
print $key . "_write.negative " . $key . "_read\n";
print_thresholds($key . "_read");
print_thresholds($key . "_write");
}
exit 0;
}
foreach my $key (sort by_dev keys %devs) {
print $key, "_read.value ", $devs{$key}->{rsect}, "\n";
print $key, "_write.value ", $devs{$key}->{wsect}, "\n";
}
sub by_dev {
return $a cmp $b;
}
sub fetch_stat() {
open (IN, "/proc/stat") or
die "Could not open /proc/stat for reading: $!\n";
while (<IN>) {
next unless (/^disk_io:\s*(.+)\s*/);
foreach my $dev (split /\s+/) {
next unless $dev =~ /\S/;
next unless ($dev =~ /\((\d+),(\d+)\):\(\d+,(\d+),(\d+),(\d+),(\d+)\)/);
my $name = "dev".$1."_".$2;
$devs{$name} =
{
name => $name,
rio => $3,
rsect => $4,
wio => $5,
wsect => $6
};
}
}
close (IN);
}
my %maj_count;
sub get_disk_count() {
my @disk_count;
my $major = $_[0];
$maj_count{$major} = 0 unless exists($maj_count{$major});
$disk_count[0] = $maj_count{$major}++;
die "Could not find disk_count for major: $major"
unless (exists($disk_count[0]));
return $disk_count[0];
}
sub fetch_detailed() {
if (open(DETAILED, "/proc/diskstats") or
open(DETAILED, "/proc/partitions")) {
while (<DETAILED>) {
if (/^\s+(\d+)\s+\d+\s*\d*\s+([[:alpha:][:digit:]\/]+)\s+(.*)/) {
my @fields = split(/\s+/, $3);
my $tmpnam = $2;
my $major = $1;
if ($tmpnam =~ /\d+$/ and !$include_numbered) {
# Special case for devices like cXdXpX,
# like the cciss driver
next unless $tmpnam =~ /\/c\d+d\d+$/
}
next unless grep { $_ } @fields;
$tmpnam =~ s/\/[[:alpha:]]+(\d+)/\/$1/g;
$tmpnam =~ s/^([^\/]+)\//$1/;
$tmpnam =~ s/\/disc$//;
$devs{"dev".$major."_".&get_disk_count($major)} =
{
major => $major,
name => $tmpnam,
rio => $fields[0],
rmerge => $fields[1],
rsect => $fields[2],
ruse => $fields[3],
wio => $fields[4],
wmerge => $fields[5],
wsect => $fields[6],
wuse => $fields[7],
running => $fields[8],
use => $fields[9],
aveq => $fields[10]
};
}
}
close (DETAILED);
}
}
# vim:syntax=perl
|