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#!/usr/bin/env -iS perl
#
# $Id$
#
# Copyright (c) 2008 Ben Rockwood <benr@cuddletech.com>,
# Copyright (c) 2010-2011 Jason J. Hellenthal <jhell@DataIX.net>,
# Copyright (c) 2010-2012 Martin Matuska <mm@FreeBSD.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# zfs-stats is a fork of arc_summary.pl maintained by Jason J. Hellenthal
# http://code.google.com/p/jhell/
#
# If you are having troubles when using this script from cron(8) please try
# adjusting your PATH before reporting problems.
#
# /usr/bin & /sbin
#
# Binaries used are:
#
# kldstat(8), sysctl(8) & vmstat(8)

use strict;
use warnings;
use Getopt::Long;
Getopt::Long::Configure ("bundling");

my $version = '1.3.0';

my $usetunable = 1; # Change to 0 to disable sysctl MIB spill.
my $show_sysctl_descriptions = 0; # Change to 1 (or use the -d flag) to show sysctl descriptions.
my $alternate_sysctl_layout = 0; # Change to 1 (or use the -t flag) for alternate output.
my $raw_data; # Raw data

my $Kstat;

my %cmds = (
sysctl_q => '/sbin/sysctl -q',
uname_v => 'uname -v',
uptime => 'uptime',
kldstat => 'kldstat',
vmstat_m => '/usr/bin/vmstat -m',
);

my %ssh;

sub run{
my $cmd = shift;
if( exists $cmds{$cmd} ){
$cmd = $cmds{$cmd};
}

my @ssh;
if( $ssh{hostname} ){
push @ssh, 'ssh', $ssh{hostname};
push @ssh, '-l', $ssh{user} if $ssh{user};
push @ssh, '-i', $ssh{id_file} if $ssh{id_file};
push @ssh, '-p', $ssh{port} if $ssh{port};
}

return `@ssh $cmd @_`;
}

sub _usage {
print STDERR << "EOF";
Usage: $0 [-ABDHLMSabdhus]

-a : all statistics (-IMAELZDs)

-I : general system information
-M : system memory information
-s : sysctl ZFS tunables
-d : descriptions for ZFS tunables
-t : alternate sysctl layout (arc_summary.pl)

-A : ARC summary
-E : ARC efficiency
-D : VDEV cache statistics
-L : L2 ARC statistics
-Z : DMU (zfetch) statistics

-R : display raw numbers and bytes
-V : display program version and exit
-h : display this (help) message

example: $0 -a

Additionally this command can give you information
on another computer through ssh.

--hostname : address or hostname of the remote computer
--port : port of the ssh server on the remote computer
--user : user name on the remote computer
--id_file : path to the identity file to use

example: $0 -a --hostname server.local --user somebody
EOF
exit;
}

sub _version {
printf("zfs-stats version %s\n", $version);
exit 0
}

sub div1 {
print "\n";
print '-' x 72;
print "\n";
}

sub div2 { div1; print "\n"; }

my @binary_prefix = (
['YiB', 2 ** 80],
['ZiB', 2 ** 70],
['EiB', 2 ** 60],
['PiB', 2 ** 50],
['TiB', 2 ** 40],
['GiB', 2 ** 30],
['MiB', 2 ** 20],
['KiB', 2 ** 10],
);
sub fBytes {
my ( $Bytes, $Decimal ) = @_;
if ($raw_data) { return $Bytes };

defined($Bytes) or $Bytes = 0;
defined($Decimal) or $Decimal = 2;

for( @binary_prefix ){
my($prefix,$cmp) = @$_;

next if $Bytes < $cmp;
return sprintf("%0.${Decimal}f\t%s", $Bytes / $cmp, $prefix );
}

return "$Bytes\tBytes";
}

my @hits_compare = (
['S', 10**24],
['s', 10**21],
['Q', 10**18],
['q', 10**15],
['t', 10**12],
['b', 10**9 ],
['m', 10**6 ],
['k', 10**3 ],
);
sub fHits {
my ( $Hits, $Decimal ) = @_;
if ($raw_data) { return $_[0] }

defined($Hits) or $Hits = 0;
defined($Decimal) or $Decimal = 2;

for( @hits_compare ){
my($prefix,$cmp) = @$_;

next if $Hits < $cmp;
return sprintf("%0.${Decimal}f\t%s", $Hits / $cmp, $prefix );
}

return $Hits;
}

sub fPerc {
my $lVal = $_[0] || 0;
defined($lVal) or $lVal = 0;

my $rVal = $_[1] || 0;
defined($rVal) or $rVal = 0;

my $Decimal = $_[2] || 2;
defined($Decimal) or $Decimal = 2;

if ($rVal > 0) {
return sprintf('%0.' . $Decimal . 'f', 100*($lVal / $rVal)) . "%";
} else { return sprintf('%0.' . $Decimal . 'f', 100) . "%"; }
}

my @Kstats = qw(
hw.machine
hw.machine_arch
hw.pagesize
hw.physmem
kern.maxusers
kern.osreldate
vm.kmem_map_free
vm.kmem_map_size
vm.kmem_size
vm.kmem_size_max
vm.kmem_size_min
vm.kmem_size_scale
vm.stats
kstat.zfs
vfs.zfs
);

sub _start {
my $daydate = localtime; chomp $daydate;
div1;
printf("ZFS Subsystem Report\t\t\t\t%s", $daydate);
div2;
}

sub _system_info {
my $unamev = run('uname_v');
$unamev =~ s/@.*//;
chomp $unamev;
$unamev =~ s/\s+/ /g;
my $sysuptime = run('uptime');
print "System Information:\n";
print "\n";
printf("\tKernel Version:\t\t\t\t%d (osreldate)\n", $Kstat->{"kern.osreldate"});
printf("\tHardware Platform:\t\t\t%s\n", $Kstat->{"hw.machine"});
printf("\tProcessor Architecture:\t\t\t%s\n", $Kstat->{"hw.machine_arch"});
print "\n";
printf("\tZFS Storage pool Version:\t\t%d\n", $Kstat->{"vfs.zfs.version.spa"});
printf("\tZFS Filesystem Version:\t\t\t%d\n", $Kstat->{"vfs.zfs.version.zpl"});
print "\n";
printf("%s", $unamev);
printf("%s", $sysuptime);
}

sub _system_memory {
sub mem_rounded {
my ($mem_size) = @_;
my $chip_size = 1;
my $chip_guess = ($mem_size / 8) - 1;
while ($chip_guess != 0) {
$chip_guess >>= 1;
$chip_size <<= 1;
}
my $mem_round = (int($mem_size / $chip_size) + 1) * $chip_size;
return $mem_round;
}

my $pagesize = $Kstat->{"hw.pagesize"};
my $mem_hw = &mem_rounded($Kstat->{"hw.physmem"});
my $mem_phys = $Kstat->{"hw.physmem"};
my $mem_all = $Kstat->{"vm.stats.vm.v_page_count"} * $pagesize;
my $mem_wire = $Kstat->{"vm.stats.vm.v_wire_count"} * $pagesize;
my $mem_active = $Kstat->{"vm.stats.vm.v_active_count"} * $pagesize;
my $mem_inactive = $Kstat->{"vm.stats.vm.v_inactive_count"} * $pagesize;
my $mem_cache = $Kstat->{"vm.stats.vm.v_cache_count"} * $pagesize;
my $mem_free = $Kstat->{"vm.stats.vm.v_free_count"} * $pagesize;

my $mem_gap_vm = $mem_all - ($mem_wire + $mem_active + $mem_inactive + $mem_cache + $mem_free);

my $mem_total = $mem_hw;
my $mem_avail = $mem_inactive + $mem_cache + $mem_free;
my $mem_used = $mem_total - $mem_avail;

print "System Memory:\n";
print "\n";
printf("\t%s\t%s Active,\t", fPerc($mem_active, $mem_all), fBytes($mem_active));
printf("%s\t%s Inact\n", fPerc($mem_inactive, $mem_all), fBytes($mem_inactive));
printf("\t%s\t%s Wired,\t", fPerc($mem_wire, $mem_all), fBytes($mem_wire));
printf("%s\t%s Cache\n", fPerc($mem_cache, $mem_all), fBytes($mem_cache));
printf("\t%s\t%s Free,\t", fPerc($mem_free, $mem_all), fBytes($mem_free));
printf("%s\t%s Gap\n", fPerc($mem_gap_vm, $mem_all), fBytes($mem_gap_vm));
print "\n";
printf("\tReal Installed:\t\t\t\t%s\n", fBytes($mem_hw));
printf("\tReal Available:\t\t\t%s\t%s\n", fPerc($mem_phys, $mem_hw), fBytes($mem_phys));
printf("\tReal Managed:\t\t\t%s\t%s\n", fPerc($mem_all, $mem_phys), fBytes($mem_all));
print "\n";
printf("\tLogical Total:\t\t\t\t%s\n", fBytes($mem_total));
printf("\tLogical Used:\t\t\t%s\t%s\n", fPerc($mem_used, $mem_total), fBytes($mem_used));
printf("\tLogical Free:\t\t\t%s\t%s\n", fPerc($mem_avail, $mem_total), fBytes($mem_avail));
print "\n";

my @ktext = map { hex( (split)[3] ) } run('kldstat'); # retrieve the size column and convert from hex
my $ktext;
$ktext += $_ for @ktext; # add the elements of size up

my @kdata = map { /([0-9]+)K/ } run('vmstat_m'); # retrieve the MemUse column
my $kdata;
$kdata += $_ for @kdata; # add the elements of MemUse up
$kdata *= 1024; # convert from KiB to Bytes

my $kmem = ($ktext + $kdata);
my $kmem_map_size = $Kstat->{"vm.kmem_map_size"};
my $kmem_map_free = $Kstat->{"vm.kmem_map_free"};
my $kmem_map_total = ($kmem_map_size + $kmem_map_free);

printf("Kernel Memory:\t\t\t\t\t%s\n", fBytes($kmem));
printf("\tData:\t\t\t\t%s\t%s\n", fPerc($kdata, $kmem), fBytes($kdata));
printf("\tText:\t\t\t\t%s\t%s\n\n", fPerc($ktext, $kmem), fBytes($ktext));

printf("Kernel Memory Map:\t\t\t\t%s\n", fBytes($kmem_map_total));
printf("\tSize:\t\t\t\t%s\t%s\n", fPerc($kmem_map_size, $kmem_map_total), fBytes($kmem_map_size));
printf("\tFree:\t\t\t\t%s\t%s\n", fPerc($kmem_map_free, $kmem_map_total), fBytes($kmem_map_free));
}


sub _arc_summary {
my $memory_throttle_count = $Kstat->{"kstat.zfs.misc.arcstats.memory_throttle_count"};

print "ARC Summary: ";
if ($memory_throttle_count > 0) {
print "(THROTTLED)\n";
} else { print "(HEALTHY)\n"; }
printf("\tMemory Throttle Count:\t\t\t%s\n", fHits($memory_throttle_count));
print "\n";

### ARC Misc. ###
my $deleted = $Kstat->{"kstat.zfs.misc.arcstats.deleted"};
my $evict_skip = $Kstat->{"kstat.zfs.misc.arcstats.evict_skip"};
my $mutex_miss = $Kstat->{"kstat.zfs.misc.arcstats.mutex_miss"};
my $recycle_miss = $Kstat->{"kstat.zfs.misc.arcstats.recycle_miss"};

print "ARC Misc:\n";
printf("\tDeleted:\t\t\t\t%s\n", fHits($deleted));
printf("\tRecycle Misses:\t\t\t\t%s\n", fHits($recycle_miss));
printf("\tMutex Misses:\t\t\t\t%s\n", fHits($mutex_miss));
printf("\tEvict Skips:\t\t\t\t%s\n", fHits($evict_skip));
print "\n";

### ARC Sizing ###
my $arc_size = $Kstat->{"kstat.zfs.misc.arcstats.size"};
my $mru_size = $Kstat->{"kstat.zfs.misc.arcstats.p"};
my $target_max_size = $Kstat->{"kstat.zfs.misc.arcstats.c_max"};
my $target_min_size = $Kstat->{"kstat.zfs.misc.arcstats.c_min"};
my $target_size = $Kstat->{"kstat.zfs.misc.arcstats.c"};

my $target_size_ratio = ($target_max_size / $target_min_size);

printf("ARC Size:\t\t\t\t%s\t%s\n",
fPerc($arc_size, $target_max_size), fBytes($arc_size));
printf("\tTarget Size: (Adaptive)\t\t%s\t%s\n",
fPerc($target_size, $target_max_size), fBytes($target_size));
printf("\tMin Size (Hard Limit):\t\t%s\t%s\n",
fPerc($target_min_size, $target_max_size), fBytes($target_min_size));
printf("\tMax Size (High Water):\t\t%d:1\t%s\n",
$target_size_ratio, fBytes($target_max_size));

print "\nARC Size Breakdown:\n";
if ($arc_size > $target_size) {
my $mfu_size = ($arc_size - $mru_size);
printf("\tRecently Used Cache Size:\t%s\t%s\n",
fPerc($mru_size, $arc_size), fBytes($mru_size));
printf("\tFrequently Used Cache Size:\t%s\t%s\n",
fPerc($mfu_size, $arc_size), fBytes($mfu_size));
}

if ($arc_size < $target_size) {
my $mfu_size = ($target_size - $mru_size);
printf("\tRecently Used Cache Size:\t%s\t%s\n",
fPerc($mru_size, $target_size), fBytes($mru_size));
printf("\tFrequently Used Cache Size:\t%s\t%s\n",
fPerc($mfu_size, $target_size), fBytes($mfu_size));
}
print "\n";

### ARC Hash Breakdown ###
my $hash_chain_max = $Kstat->{"kstat.zfs.misc.arcstats.hash_chain_max"};
my $hash_chains = $Kstat->{"kstat.zfs.misc.arcstats.hash_chains"};
my $hash_collisions = $Kstat->{"kstat.zfs.misc.arcstats.hash_collisions"};
my $hash_elements = $Kstat->{"kstat.zfs.misc.arcstats.hash_elements"};
my $hash_elements_max = $Kstat->{"kstat.zfs.misc.arcstats.hash_elements_max"};

print "ARC Hash Breakdown:\n";
printf("\tElements Max:\t\t\t\t%s\n", fHits($hash_elements_max));
printf("\tElements Current:\t\t%s\t%s\n",
fPerc($hash_elements, $hash_elements_max), fHits($hash_elements));
printf("\tCollisions:\t\t\t\t%s\n", fHits($hash_collisions));
printf("\tChain Max:\t\t\t\t%s\n", fHits($hash_chain_max));
printf("\tChains:\t\t\t\t\t%s\n", fHits($hash_chains));
}

sub _arc_efficiency {
my $arc_hits = $Kstat->{"kstat.zfs.misc.arcstats.hits"};
my $arc_misses = $Kstat->{"kstat.zfs.misc.arcstats.misses"};
my $demand_data_hits = $Kstat->{"kstat.zfs.misc.arcstats.demand_data_hits"};
my $demand_data_misses = $Kstat->{"kstat.zfs.misc.arcstats.demand_data_misses"};
my $demand_metadata_hits = $Kstat->{"kstat.zfs.misc.arcstats.demand_metadata_hits"};
my $demand_metadata_misses = $Kstat->{"kstat.zfs.misc.arcstats.demand_metadata_misses"};
my $mfu_ghost_hits = $Kstat->{"kstat.zfs.misc.arcstats.mfu_ghost_hits"};
my $mfu_hits = $Kstat->{"kstat.zfs.misc.arcstats.mfu_hits"};
my $mru_ghost_hits = $Kstat->{"kstat.zfs.misc.arcstats.mru_ghost_hits"};
my $mru_hits = $Kstat->{"kstat.zfs.misc.arcstats.mru_hits"};
my $prefetch_data_hits = $Kstat->{"kstat.zfs.misc.arcstats.prefetch_data_hits"};
my $prefetch_data_misses = $Kstat->{"kstat.zfs.misc.arcstats.prefetch_data_misses"};
my $prefetch_metadata_hits = $Kstat->{"kstat.zfs.misc.arcstats.prefetch_metadata_hits"};
my $prefetch_metadata_misses = $Kstat->{"kstat.zfs.misc.arcstats.prefetch_metadata_misses"};

my $anon_hits = $arc_hits - ($mfu_hits + $mru_hits + $mfu_ghost_hits + $mru_ghost_hits);
my $arc_accesses_total = ($arc_hits + $arc_misses);
my $demand_data_total = ($demand_data_hits + $demand_data_misses);
my $prefetch_data_total = ($prefetch_data_hits + $prefetch_data_misses);
my $real_hits = ($mfu_hits + $mru_hits);

printf("ARC Efficiency:\t\t\t\t\t%s\n", fHits($arc_accesses_total));
printf("\tCache Hit Ratio:\t\t%s\t%s\n",
fPerc($arc_hits, $arc_accesses_total), fHits($arc_hits));
printf("\tCache Miss Ratio:\t\t%s\t%s\n",
fPerc($arc_misses, $arc_accesses_total), fHits($arc_misses));
printf("\tActual Hit Ratio:\t\t%s\t%s\n",
fPerc($real_hits, $arc_accesses_total), fHits($real_hits));
print "\n";
printf("\tData Demand Efficiency:\t\t%s\t%s\n",
fPerc($demand_data_hits, $demand_data_total), fHits($demand_data_total));

if ($prefetch_data_total > 0){
printf("\tData Prefetch Efficiency:\t%s\t%s\n",
fPerc($prefetch_data_hits, $prefetch_data_total), fHits($prefetch_data_total));
}
print "\n";

print "\tCACHE HITS BY CACHE LIST:\n";
if ( $anon_hits > 0 ){
printf("\t Anonymously Used:\t\t%s\t%s\n",
fPerc($anon_hits, $arc_hits), fHits($anon_hits));
}

printf("\t Most Recently Used:\t\t%s\t%s\n",
fPerc($mru_hits, $arc_hits), fHits($mru_hits));
printf("\t Most Frequently Used:\t\t%s\t%s\n",
fPerc($mfu_hits, $arc_hits), fHits($mfu_hits));
printf("\t Most Recently Used Ghost:\t%s\t%s\n",
fPerc($mru_ghost_hits, $arc_hits), fHits($mru_ghost_hits));
printf("\t Most Frequently Used Ghost:\t%s\t%s\n",
fPerc($mfu_ghost_hits, $arc_hits), fHits($mfu_ghost_hits));

print "\n\tCACHE HITS BY DATA TYPE:\n";
printf("\t Demand Data:\t\t\t%s\t%s\n",
fPerc($demand_data_hits, $arc_hits), fHits($demand_data_hits));
printf("\t Prefetch Data:\t\t%s\t%s\n",
fPerc($prefetch_data_hits, $arc_hits), fHits($prefetch_data_hits));
printf("\t Demand Metadata:\t\t%s\t%s\n",
fPerc($demand_metadata_hits, $arc_hits), fHits($demand_metadata_hits));
printf("\t Prefetch Metadata:\t\t%s\t%s\n",
fPerc($prefetch_metadata_hits, $arc_hits), fHits($prefetch_metadata_hits));

print "\n\tCACHE MISSES BY DATA TYPE:\n";
printf("\t Demand Data:\t\t\t%s\t%s\n",
fPerc($demand_data_misses, $arc_misses), fHits($demand_data_misses));
printf("\t Prefetch Data:\t\t%s\t%s\n",
fPerc($prefetch_data_misses, $arc_misses), fHits($prefetch_data_misses));
printf("\t Demand Metadata:\t\t%s\t%s\n",
fPerc($demand_metadata_misses, $arc_misses), fHits($demand_metadata_misses));
printf("\t Prefetch Metadata:\t\t%s\t%s\n",
fPerc($prefetch_metadata_misses, $arc_misses), fHits($prefetch_metadata_misses));
}

sub _l2arc_summary {
my $l2_size = $Kstat->{"kstat.zfs.misc.arcstats.l2_size"};

if ($l2_size == 0) {
print "L2ARC is disabled\n";
return;
}

my $l2_abort_lowmem = $Kstat->{"kstat.zfs.misc.arcstats.l2_abort_lowmem"};
my $l2_cksum_bad = $Kstat->{"kstat.zfs.misc.arcstats.l2_cksum_bad"};
my $l2_evict_lock_retry = $Kstat->{"kstat.zfs.misc.arcstats.l2_evict_lock_retry"};
my $l2_evict_reading = $Kstat->{"kstat.zfs.misc.arcstats.l2_evict_reading"};
my $l2_feeds = $Kstat->{"kstat.zfs.misc.arcstats.l2_feeds"};
my $l2_free_on_write = $Kstat->{"kstat.zfs.misc.arcstats.l2_free_on_write"};
my $l2_hdr_size = $Kstat->{"kstat.zfs.misc.arcstats.l2_hdr_size"};
my $l2_hits = $Kstat->{"kstat.zfs.misc.arcstats.l2_hits"};
my $l2_io_error = $Kstat->{"kstat.zfs.misc.arcstats.l2_io_error"};
my $l2_misses = $Kstat->{"kstat.zfs.misc.arcstats.l2_misses"};
my $l2_rw_clash = $Kstat->{"kstat.zfs.misc.arcstats.l2_rw_clash"};
my $l2_write_buffer_bytes_scanned = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_buffer_bytes_scanned"};
my $l2_write_buffer_iter = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_buffer_iter"};
my $l2_write_buffer_list_iter = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_buffer_list_iter"};
my $l2_write_buffer_list_null_iter = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_buffer_list_null_iter"};
my $l2_write_bytes = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_bytes"};
my $l2_write_full = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_full"};
my $l2_write_in_l2 = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_in_l2"};
my $l2_write_io_in_progress = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_io_in_progress"};
my $l2_write_not_cacheable = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_not_cacheable"};
my $l2_write_passed_headroom = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_passed_headroom"};
my $l2_write_pios = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_pios"};
my $l2_write_spa_mismatch = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_spa_mismatch"};
my $l2_write_trylock_fail = $Kstat->{"kstat.zfs.misc.arcstats.l2_write_trylock_fail"};
my $l2_writes_done = $Kstat->{"kstat.zfs.misc.arcstats.l2_writes_done"};
my $l2_writes_error = $Kstat->{"kstat.zfs.misc.arcstats.l2_writes_error"};
my $l2_writes_hdr_miss = $Kstat->{"kstat.zfs.misc.arcstats.l2_writes_hdr_miss"};
my $l2_writes_sent = $Kstat->{"kstat.zfs.misc.arcstats.l2_writes_sent"};

my $l2_access_total = ($l2_hits + $l2_misses);
my $l2_health_count = ($l2_writes_error + $l2_cksum_bad + $l2_io_error);

print "L2 ARC Summary: ";
if ($l2_health_count > 0) {
print "(DEGRADED)\n";
} else { print "(HEALTHY)\n"; }
printf("\tPassed Headroom:\t\t\t%s\n", fHits($l2_write_passed_headroom));
printf("\tTried Lock Failures:\t\t\t%s\n", fHits($l2_write_trylock_fail));
printf("\tIO In Progress:\t\t\t\t%s\n", fHits($l2_write_io_in_progress));
printf("\tLow Memory Aborts:\t\t\t%s\n", fHits($l2_abort_lowmem));
printf("\tFree on Write:\t\t\t\t%s\n", fHits($l2_free_on_write));
printf("\tWrites While Full:\t\t\t%s\n", fHits($l2_write_full));
printf("\tR/W Clashes:\t\t\t\t%s\n", fHits($l2_rw_clash));
printf("\tBad Checksums:\t\t\t\t%s\n", fHits($l2_cksum_bad));
printf("\tIO Errors:\t\t\t\t%s\n", fHits($l2_io_error));
printf("\tSPA Mismatch:\t\t\t\t%s\n", fHits($l2_write_spa_mismatch));
print "\n";

printf("L2 ARC Size: (Adaptive)\t\t\t\t%s\n", fBytes($l2_size));
printf("\tHeader Size:\t\t\t%s\t%s\n",
fPerc($l2_hdr_size, $l2_size), fBytes($l2_hdr_size));
print "\n";

if (($l2_evict_lock_retry + $l2_evict_reading) > 0) {
print "L2 ARC Evicts:\n";
printf("\tLock Retries:\t\t\t\t%s\n", fHits($l2_evict_lock_retry));
printf("\tUpon Reading:\t\t\t\t%s\n", fHits($l2_evict_reading));
print "\n";
}
printf("L2 ARC Breakdown:\t\t\t\t%s\n", fHits($l2_access_total));
printf("\tHit Ratio:\t\t\t%s\t%s\n",
fPerc($l2_hits, $l2_access_total), fHits($l2_hits));
printf("\tMiss Ratio:\t\t\t%s\t%s\n",
fPerc($l2_misses, $l2_access_total), fHits($l2_misses));
printf("\tFeeds:\t\t\t\t\t%s\n", fHits($l2_feeds));
print "\n";

print "L2 ARC Buffer:\n";
printf("\tBytes Scanned:\t\t\t\t%s\n", fBytes($l2_write_buffer_bytes_scanned));
printf("\tBuffer Iterations:\t\t\t%s\n", fHits($l2_write_buffer_iter));
printf("\tList Iterations:\t\t\t%s\n", fHits($l2_write_buffer_list_iter));
printf("\tNULL List Iterations:\t\t\t%s\n", fHits($l2_write_buffer_list_null_iter));
print "\n";

print "L2 ARC Writes:\n";
if ($l2_writes_done != $l2_writes_sent) {
printf("\tWrites Sent: (%s)\t\t\t\t%s\n",
"FAULTED", fHits($l2_writes_sent));
printf("\t Done Ratio:\t\t\t%s\t%s\n",
fPerc($l2_writes_done, $l2_writes_sent), fHits($l2_writes_done));
printf("\t Error Ratio:\t\t\t%s\t%s\n",
fPerc($l2_writes_error, $l2_writes_sent), fHits($l2_writes_error));
} else { printf("\tWrites Sent:\t\t\t%s\t%s\n", fPerc(100), fHits($l2_writes_sent)); }
}

sub _dmu_summary {
my $zfetch_bogus_streams = $Kstat->{"kstat.zfs.misc.zfetchstats.bogus_streams"};
my $zfetch_colinear_hits = $Kstat->{"kstat.zfs.misc.zfetchstats.colinear_hits"};
my $zfetch_colinear_misses = $Kstat->{"kstat.zfs.misc.zfetchstats.colinear_misses"};
my $zfetch_hits = $Kstat->{"kstat.zfs.misc.zfetchstats.hits"};
my $zfetch_misses = $Kstat->{"kstat.zfs.misc.zfetchstats.misses"};
my $zfetch_reclaim_failures = $Kstat->{"kstat.zfs.misc.zfetchstats.reclaim_failures"};
my $zfetch_reclaim_successes = $Kstat->{"kstat.zfs.misc.zfetchstats.reclaim_successes"};
my $zfetch_streams_noresets = $Kstat->{"kstat.zfs.misc.zfetchstats.streams_noresets"};
my $zfetch_streams_resets = $Kstat->{"kstat.zfs.misc.zfetchstats.streams_resets"};
my $zfetch_stride_hits = $Kstat->{"kstat.zfs.misc.zfetchstats.stride_hits"};
my $zfetch_stride_misses = $Kstat->{"kstat.zfs.misc.zfetchstats.stride_misses"};

my $zfetch_access_total = ($zfetch_hits + $zfetch_misses);
my $zfetch_colinear_total = ($zfetch_colinear_hits + $zfetch_colinear_misses);
my $zfetch_health_count = ($zfetch_bogus_streams);
my $zfetch_reclaim_total = ($zfetch_reclaim_successes + $zfetch_reclaim_failures);
my $zfetch_streams_total = ($zfetch_streams_resets + $zfetch_streams_noresets + $zfetch_bogus_streams);
my $zfetch_stride_total = ($zfetch_stride_hits + $zfetch_stride_misses);

if ($zfetch_access_total > 0) {
print "File-Level Prefetch: ";
if ($zfetch_health_count > 0) {
print "(DEGRADED)\n\n";
} else { print "(HEALTHY)\n\n"; }
printf("DMU Efficiency:\t\t\t\t\t%s\n", fHits($zfetch_access_total));
printf("\tHit Ratio:\t\t\t%s\t%s\n",
fPerc($zfetch_hits, $zfetch_access_total),
fHits($zfetch_hits));
printf("\tMiss Ratio:\t\t\t%s\t%s\n",
fPerc($zfetch_misses, $zfetch_access_total),
fHits($zfetch_misses));
print "\n";

printf("\tColinear:\t\t\t\t%s\n", fHits($zfetch_colinear_total));
printf("\t Hit Ratio:\t\t\t%s\t%s\n",
fPerc($zfetch_colinear_hits, $zfetch_colinear_total),
fHits($zfetch_colinear_hits));
printf("\t Miss Ratio:\t\t\t%s\t%s\n",
fPerc($zfetch_colinear_misses, $zfetch_colinear_total),
fHits($zfetch_colinear_misses));
print "\n";

printf("\tStride:\t\t\t\t\t%s\n", fHits($zfetch_stride_total));
printf("\t Hit Ratio:\t\t\t%s\t%s\n",
fPerc($zfetch_stride_hits, $zfetch_stride_total),
fHits($zfetch_stride_hits));
printf("\t Miss Ratio:\t\t\t%s\t%s\n",
fPerc($zfetch_stride_misses, $zfetch_stride_total),
fHits($zfetch_stride_misses));
print "\n";

if ($zfetch_health_count > 0) {
printf("DMU Misc: (%s)\n", "FAULTED");
} else { print "DMU Misc:\n"; }
printf("\tReclaim:\t\t\t\t%s\n", fHits($zfetch_reclaim_total));
printf("\t Successes:\t\t\t%s\t%s\n",
fPerc($zfetch_reclaim_successes, $zfetch_reclaim_total),
fHits($zfetch_reclaim_successes));
printf("\t Failures:\t\t\t%s\t%s\n",
fPerc($zfetch_reclaim_failures, $zfetch_reclaim_total),
fHits($zfetch_reclaim_failures));
printf("\n\tStreams:\t\t\t\t%s\n", fHits($zfetch_streams_total));
printf("\t +Resets:\t\t\t%s\t%s\n",
fPerc($zfetch_streams_resets, $zfetch_streams_total),
fHits($zfetch_streams_resets));
printf("\t -Resets:\t\t\t%s\t%s\n",
fPerc($zfetch_streams_noresets, $zfetch_streams_total),
fHits($zfetch_streams_noresets));
printf("\t Bogus:\t\t\t\t%s\n", fHits($zfetch_bogus_streams));
}
}

sub _vdev_summary {
my $vdev_cache_delegations = $Kstat->{"kstat.zfs.misc.vdev_cache_stats.delegations"};
my $vdev_cache_misses = $Kstat->{"kstat.zfs.misc.vdev_cache_stats.misses"};
my $vdev_cache_hits = $Kstat->{"kstat.zfs.misc.vdev_cache_stats.hits"};
my $vdev_cache_total = ($vdev_cache_misses + $vdev_cache_hits + $vdev_cache_delegations);

if ($Kstat->{"vfs.zfs.vdev.cache.size"} == 0) {
printf "VDEV cache is disabled\n";
} elsif ($vdev_cache_total > 0) {
printf("VDEV Cache Summary:\t\t\t\t%s\n", fHits($vdev_cache_total));
printf("\tHit Ratio:\t\t\t%s\t%s\n",
fPerc($vdev_cache_hits, $vdev_cache_total), fHits($vdev_cache_hits));
printf("\tMiss Ratio:\t\t\t%s\t%s\n",
fPerc($vdev_cache_misses, $vdev_cache_total), fHits($vdev_cache_misses));
printf("\tDelegations:\t\t\t%s\t%s\n",
fPerc($vdev_cache_delegations, $vdev_cache_total), fHits($vdev_cache_delegations));
}
}

sub _sysctl_summary {
return unless $usetunable;
my @Tunable = qw(
kern.maxusers
vm.kmem_size
vm.kmem_size_scale
vm.kmem_size_min
vm.kmem_size_max
vfs.zfs
);
my %sysctl_descriptions;
if ($show_sysctl_descriptions) {
foreach my $tunable ( run('sysctl_q','-de', @Tunable) ){
chomp $tunable;
my ($name, $description) = split(/=/, $tunable, 2);
$description = "Description unavailable" unless $description;
$sysctl_descriptions{$name}=$description;
}
}
my @tunable = run('sysctl_q', '-e', @Tunable);
print "ZFS Tunables (sysctl):\n";
foreach my $tunable (@tunable){
chomp($tunable);
my ($name, $value) = split(/=/, $tunable, 2);
my $format = $alternate_sysctl_layout ? "\t%s=%d\n" : "\t%-40s%d\n";
if ($show_sysctl_descriptions != 0){
printf("\t\# %s\n", $sysctl_descriptions{$name});
}
printf($format, $name, $value);
}
}

my @unSub = map { $_, \&div2 }(
\&_system_info,
\&_system_memory,
\&_arc_summary,
\&_arc_efficiency,
\&_l2arc_summary,
\&_dmu_summary,
\&_vdev_summary,
\&_sysctl_summary,
);

my %opt;
GetOptions( \%opt,
qw"A D E I|F L M R|B Z a d t u s",
h => \&_usage, # exits
V => \&_version, # exits
qw"hostname=s user=s id_file=s port=s",
) || _usage;

for( grep { length > 1 } keys %opt ){
$ssh{$_} = $opt{$_}
}

$alternate_sysctl_layout = 1 if $opt{t};
$show_sysctl_descriptions = 1 if $opt{d};
$raw_data = 1 if $opt{R};

my @Kstat_pull = run( 'sysctl_q', @Kstats );
foreach my $kstat (@Kstat_pull) {
chomp $kstat;
if ($kstat =~ m/^([^:]+):\s+(.+)\s*$/s) {
$Kstat->{$1} = $2;
};
};

if (!$Kstat->{"vfs.zfs.version.spa"}) {
printf(STDERR "ZFS module not loaded\n");
exit 1;
};

my @out;
if ($opt{a}) {
@out = @unSub;
} else {
if ($opt{I}) { push @out, \&_system_info, \&div2 }
if ($opt{M}) { push @out, \&_system_memory, \&div2 }
if ($opt{A}) { push @out, \&_arc_summary, \&div2 }
if ($opt{E}) { push @out, \&_arc_efficiency, \&div2 }
if ($opt{L}) { push @out, \&_l2arc_summary, \&div2 }
if ($opt{Z}) { push @out, \&_dmu_summary, \&div2 }
if ($opt{D}) { push @out, \&_vdev_summary, \&div2 }
if ($opt{s}) { push @out, \&_sysctl_summary, \&div2 }
}
if (!@out) { _usage; exit; }
_start;
$_->() for @out;

__END__
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