Simple IO monitoring script usful on Home Assistant OS

iomonitor.sh

#!/bin/sh
#
# IO monitoring for Linux
#
# Taken from armbianmonitor
# https://github.com/armbian/build/blob/master/packages/bsp/common/usr/bin/armbianmonitor
# Adjusted to rely on diskstats only.
#

MonitorIO() {
        LastWrites=$(awk -F" " "/ $1 / {print \$8}" </proc/diskstats)
        LastWriteMerges=$(awk -F" " "/ $1 / {print \$9}" </proc/diskstats)
        LastWriteSectors=$(awk -F" " "/ $1 / {print \$10}" </proc/diskstats)
        FirstTimeWrites=${LastWrites}
        FirstTimeWriteMerges=${LastWriteMerges}
        FirstTimeSectors=${LastWriteSectors}
        TimeNow=$(date "+%s")
        LastTimeChecked=${TimeNow}
        FirstTimeChecked=${LastTimeChecked}
        echo -e "$(LANG=C date)$(printf "%8s%8s%12s" "Count" "Merge" "Size") Start monitoring IOs"

        while [ "$((${TimeNow} - ${FirstTimeChecked}))" -lt 300 ]; do
                TimeNow=$(date "+%s")
                CurrentWrites=$(awk -F" " "/ $1 / {print \$8}" </proc/diskstats)
                if [ ${CurrentWrites} -gt ${LastWrites} ]; then
                        CurrentWriteMerges=$(awk -F" " "/ $1 / {print \$9}" </proc/diskstats)
                        CurrentWriteSectors=$(awk -F" " "/ $1 / {print \$10}" </proc/diskstats)
                        TotalWrites=$((${CurrentWrites} - ${LastWrites}))
                        TotalWriteMerges=$((${CurrentWriteMerges} - ${LastWriteMerges}))
                        BytesWritten=$(((${CurrentWriteSectors} - ${LastWriteSectors}) / 2))
                        echo -e "$(LANG=C date)$(printf "%8s%8s%12s" ${TotalWrites} ${TotalWriteMerges} ${BytesWritten}) kbytes written after $((${TimeNow} - ${LastTimeChecked})) sec"
                        LastTimeChecked=${TimeNow}
                        LastWrites=${CurrentWrites}
                        LastWriteMerges=${CurrentWriteMerges}
                        LastWriteSectors=${CurrentWriteSectors}
                fi
                sleep 1
        done
        TotalWrites=$((${CurrentWrites} - ${FirstTimeWrites}))
        TotalWriteMerges=$((${CurrentWriteMerges} - ${FirstTimeWriteMerges}))
        BytesWritten=$(((${CurrentWriteSectors} - ${FirstTimeSectors}) / 2))
        echo -e "$(LANG=C date)$(printf "%8s%8s%12s" "Count" "Merge" "Size") End monitoring IOs"
        echo -e "$(LANG=C date)$(printf "%8s%8s%12s" ${TotalWrites} ${TotalWriteMerges} ${BytesWritten}) kbytes written after $((${TimeNow} - ${FirstTimeChecked})) sec"
} # MonitorIO

MonitorIO "$@"