Blame tests/p_sysstat/10-iostat-disk-basic.sh

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#!/bin/bash
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# Author: Steve Barnes (steve@echo.id.au)
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# A simple iostat test to verify transfers are being recorded
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t_Log "Running $0 - a basic iostat test to verify disk measurement"
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# Save our iostat output somewhere
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TMP=/tmp/iostat.disk.scratch
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# dd options
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BS=4196
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COUNT=10100
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SUM=$(expr $BS \* $COUNT / 1024)
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# Clean up after ourselves
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trap "[ -e $TMP ] && { /bin/rm -f $TMP; }" EXIT
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# Clear out the pagecache to get an accurate reading
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echo 1 > /proc/sys/vm/drop_caches
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# Capture a storage device name
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DRIVE=$(fdisk -l|grep -Po -m1 '^/dev/[\D]+')
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# Run iostat on the device
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/usr/bin/iostat -dkx 1 5 $DRIVE >$TMP &
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# Let the dust settle
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sleep 4
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# Generate some read traffic
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/bin/dd if=$DRIVE of=/dev/null bs=$BS count=$COUNT &>/dev/null
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# Give iostat a chance to log our traffic
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sleep 6
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# Confirm our read bytes are >0, excluding the first 
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# line since that's the average since boot.
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BYTES_READ=$(awk '$6 ~ /[0-9]/ {NR>1 && sum+=$6} END {print int(sum)}' $TMP)
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# Check we read at least as much as requested
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[ "$BYTES_READ" -ge "$SUM" ] || { t_Log "iostat didn't log as much traffic as we generated?!...that ain't good"; }
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t_CheckExitStatus $?