/usr/lib/zfs-linux/zpool.d/iostat is in zfsutils-linux 0.7.5-1ubuntu15.
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 | #!/bin/sh
#
# Display most relevant iostat bandwidth/latency numbers. The output is
# dependent on the name of the script/symlink used to call it.
#
helpstr="
iostat: Show iostat values since boot (summary page).
iostat-1s: Do a single 1-second iostat sample and show values.
iostat-10s: Do a single 10-second iostat sample and show values."
script=$(basename "$0")
if [ "$1" = "-h" ] ; then
echo "$helpstr" | grep "$script:" | tr -s '\t' | cut -f 2-
exit
fi
if [ "$script" = "iostat-1s" ] ; then
# Do a single one-second sample
extra="1 1"
# Don't show summary stats
y="-y"
elif [ "$script" = "iostat-10s" ] ; then
# Do a single ten-second sample
extra="10 1"
# Don't show summary stats
y="-y"
fi
if [ -f "$VDEV_UPATH" ] ; then
# We're a file-based vdev, iostat doesn't work on us. Do nothing.
exit
fi
out=$(eval "iostat $y -k -x $VDEV_UPATH $extra")
# Sample output (we want the last two lines):
#
# Linux 2.6.32-642.13.1.el6.x86_64 (centos68) 03/09/2017 _x86_64_ (6 CPU)
#
# avg-cpu: %user %nice %system %iowait %steal %idle
# 0.00 0.00 0.00 0.00 0.00 100.00
#
# Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
# sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
#
# Get the column names
cols=$(echo "$out" | grep Device)
# Get the values and tab separate them to make them cut-able.
vals="$(echo "$out" | grep -A1 Device | tail -n 1 | sed -r 's/[[:blank:]]+/\t/g')"
i=0
for col in $cols ; do
i=$((i+1))
# Skip the first column since it's just the device name
if [ "$col" = "Device:" ] ; then
continue
fi
# Get i'th value
val=$(echo "$vals" | cut -f "$i")
echo "$col=$val"
done
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