1#!/bin/sh
2#
3# Display most relevant iostat bandwidth/latency numbers.  The output is
4# dependent on the name of the script/symlink used to call it.
5#
6
7helpstr="
8iostat:		Show iostat values since boot (summary page).
9iostat-1s:	Do a single 1-second iostat sample and show values.
10iostat-10s:	Do a single 10-second iostat sample and show values."
11
12script="${0##*/}"
13if [ "$1" = "-h" ] ; then
14	echo "$helpstr" | grep "$script:" | tr -s '\t' | cut -f 2-
15	exit
16fi
17
18if [ "$script" = "iostat-1s" ] ; then
19	# Do a single one-second sample
20	interval=1
21	# Don't show summary stats
22	brief="yes"
23elif [ "$script" = "iostat-10s" ] ; then
24	# Do a single ten-second sample
25	interval=10
26	# Don't show summary stats
27	brief="yes"
28fi
29
30if [ -f "$VDEV_UPATH" ] ; then
31	# We're a file-based vdev, iostat doesn't work on us.  Do nothing.
32	exit
33fi
34
35if [ "$(uname)" = "FreeBSD" ]; then
36	out=$(iostat -dKx \
37		${interval:+"-w $interval"} \
38		${interval:+"-c 1"} \
39		"$VDEV_UPATH" | tail -n 2)
40else
41	out=$(iostat -kx \
42		${brief:+"-y"} \
43		${interval:+"$interval"} \
44		${interval:+"1"} \
45		"$VDEV_UPATH" | grep -v '^$' | tail -n 2)
46fi
47
48
49# Sample output (we want the last two lines):
50#
51# Linux 2.6.32-642.13.1.el6.x86_64 (centos68) 	03/09/2017 	_x86_64_	(6 CPU)
52#
53# avg-cpu:  %user   %nice %system %iowait  %steal   %idle
54#           0.00    0.00    0.00    0.00    0.00  100.00
55#
56# Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
57# sdb               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
58#
59
60# Get the column names
61cols=$(echo "$out" | head -n 1)
62
63# Get the values and tab separate them to make them cut-able.
64vals=$(echo "$out" | tail -n 1 | tr -s '[:space:]' '\t')
65
66i=0
67for col in $cols ; do
68	i=$((i+1))
69	# Skip the first column since it's just the device name
70	if [ $i -eq 1 ]; then
71		continue
72	fi
73
74	# Get i'th value
75	val=$(echo "$vals" | cut -f "$i")
76	echo "$col=$val"
77done
78