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#!/usr/perl5/bin/perl -w
#
# CDDL HEADER START
#
# 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 usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
# Copyright (c) 2011 Joyent, Inc.
#
# ziostat - report I/O statistics per zone
#
# USAGE: ziostat [-hIMrzZ] [interval [count]]
# -h # help
# -I # print results per interval (where applicable)
# -M # print results in MB/s
# -r # print data in comma-separated format
# -z # hide zones with no ZFS I/O activity
# -Z # print data for all zones
#
# eg, ziostat # print summary since zone boot
# ziostat 1 # print continually every 1 second
# ziostat 1 5 # print 5 times, every 1 second
#
# NOTES:
#
# - The calculations and output fields emulate those from iostat(1M) as closely
# as possible. When only one zone is actively performing disk I/O, the
# results from iostat(1M) in the global zone and ziostat in the local zone
# should be almost identical.
#
# - As with iostat(1M), a result of 100% for disk utilization does not mean that
# the disk is fully saturated. Instead, that measurement just shows that at
# least one operation was pending over the last quanta of time examined.
# Since disk devices can process more than one operation concurrently, this
# measurement will frequently be 100% but the disk can still offer higher
# performance.
#
# - This script is based on Brendan Gregg's K9Toolkit examples:
#
# http://www.brendangregg.com/k9toolkit.html
#
use Getopt::Std;
use Sun::Solaris::Kstat;
my $Kstat = Sun::Solaris::Kstat->new();
# Process command line args
usage() if defined $ARGV[0] and $ARGV[0] eq "--help";
getopts('hIMrzZ') or usage();
usage() if defined $main::opt_h;
$main::opt_h = 0;
my $USE_MB = defined $main::opt_M ? $main::opt_M : 0;
my $USE_INTERVAL = defined $main::opt_I ? $main::opt_I : 0;
my $USE_COMMA = defined $main::opt_r ? $main::opt_r : 0;
my $HIDE_ZEROES = defined $main::opt_z ? $main::opt_z : 0;
my $ALL_ZONES = defined $main::opt_Z ? $main::opt_Z : 0;
my ($interval, $count);
if ( defined($ARGV[0]) ) {
$interval = $ARGV[0];
$count = defined ($ARGV[1]) ? $ARGV[1] : 2**32;
usage() if ($interval == 0);
} else {
$interval = 1;
$count = 1;
}
my $HEADER_FMT = $USE_COMMA ?
"r/%s,%sr/%s,actv,wsvc_t,asvc_t,%%b,zone\n" :
" r/%s %sr/%s actv wsvc_t asvc_t %%b zone\n";
my $DATA_FMT = $USE_COMMA ?
"%.1f,%.1f,%.1f,%.1f,%.1f,%d,%s,%d\n" :
" %6.1f %6.1f %6.1f %6.1f %6.1f %3d %s (%d)\n";
my $BYTES_PREFIX = $USE_MB ? "M" : "k";
my $BYTES_DIVISOR = $USE_MB ? 1024 * 1024 : 1024;
my $INTERVAL_SUFFIX = $USE_INTERVAL ? "i" : "s";
my $NANOSEC = 1000000000;
my @fields = ( 'reads', 'nread', 'waittime', 'rtime', 'rlentime', 'snaptime' );
chomp(my $curzone = (`/sbin/zonename`));
# Read list of visible zones and their zone IDs
my @zones = ();
my %zoneids = ();
my $zoneadm = `zoneadm list -p | cut -d: -f1,2`;
@lines = split(/\n/, $zoneadm);
foreach $line (@lines) {
@tok = split(/:/, $line);
$zoneids->{$tok[1]} = $tok[0];
push(@zones, $tok[1]);
}
my %old = ();
my $rows_printed = 0;
$Kstat->update();
for (my $ii = 0; $ii < $count; $ii++) {
# Print the column header every 20 rows
if ($rows_printed == 0 || $ALL_ZONES) {
printf($HEADER_FMT, $INTERVAL_SUFFIX, $BYTES_PREFIX,
$INTERVAL_SUFFIX, $INTERVAL_SUFFIX);
}
$rows_printed = $rows_printed >= 20 ? 0 : $rows_printed + 1;
foreach $zone (@zones) {
if ((!$ALL_ZONES) && ($zone ne $curzone)) {
next;
}
if (! defined $old->{$zone}) {
$old->{$zone} = ();
foreach $field (@fields) { $old->{$zone}->{$field} = 0; }
}
#
# Kstats have a 30-character limit (KSTAT_STRLEN) on their
# names, so if the zone name exceeds that limit, use the first
# 30 characters.
#
my $trimmed_zone = substr($zone, 0, 30);
my $zoneid = $zoneids->{$zone};
print_stats($zone, $zoneid,
$Kstat->{'zone_zfs'}{$zoneid}{$trimmed_zone}, $old->{$zone});
}
sleep ($interval);
$Kstat->update();
}
sub print_stats {
my $zone = $_[0];
my $zoneid = $_[1];
my $data = $_[2];
my $old = $_[3];
my $etime = $data->{'snaptime'} -
($old->{'snaptime'} > 0 ? $old->{'snaptime'} : $data->{'crtime'});
# Calculate basic statistics
my $rate_divisor = $USE_INTERVAL ? 1 : $etime;
my $reads = ($data->{'reads'} - $old->{'reads'}) / $rate_divisor;
my $nread = ($data->{'nread'} - $old->{'nread'}) /
$rate_divisor / $BYTES_DIVISOR;
# Calculate overall transactions per second
my $ops = $data->{'reads'} - $old->{'reads'};
my $tps = $ops / $etime;
# Calculate average length of disk run queue
my $actv = (($data->{'rlentime'} - $old->{'rlentime'}) / $NANOSEC) /
$etime;
# Calculate average disk wait and service times
my $wsvc = $ops > 0 ? (($data->{'waittime'} - $old->{'waittime'}) /
1000000) / $ops : 0.0;
my $asvc = $tps > 0 ? $actv * (1000 / $tps) : 0.0;
# Calculate the % time the disk run queue is active
my $b_pct = ((($data->{'rtime'} - $old->{'rtime'}) / $NANOSEC) /
$etime) * 100;
if (! $HIDE_ZEROES || $reads != 0.0 || $nread != 0.0 ) {
printf($DATA_FMT, $reads, $nread, $actv, $wsvc, $asvc,
$b_pct, substr($zone, 0, 8), $zoneid);
}
# Save current calculations for next loop
foreach (@fields) { $old->{$_} = $data->{$_}; }
}
sub usage {
print STDERR <<END;
USAGE: ziostat [-hIMrzZ] [interval [count]]
eg, ziostat # print summary since zone boot
ziostat 1 # print continually every 1 second
ziostat 1 5 # print 5 times, every 1 second
ziostat -I # print results per interval (where applicable)
ziostat -M # print results in MB/s
ziostat -r # print results in comma-separated format
ziostat -z # hide zones with no ZFS I/O activity
ziostat -Z # print results for all zones
END
exit 1;
}
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