Log all disk and partition write statistics on one line in file for Arch Linux

_log-write-stats.sh

#!/bin/sh
# # tail /var/log/disk-write-stats.log
# 2021-02-15 13:39:30 Written: mmcblk1p1 [512 B] mmcblk1p2 [150 MB] sda [1.61 TB]
# 2021-02-16 04:00:22 Written: mmcblk1p1 [512 B] mmcblk1p2 [163 MB] sda [1.96 TB]
# 2021-02-17 04:00:00 Written: mmcblk1p1 [512 B] mmcblk1p2 [179 MB] sda [2.52 TB]
#
# installation:
# # nano /usr/bin/log-write-stats.sh; chmod +x /usr/bin/log-write-stats.sh
# # nano /etc/systemd/system/log-write-stats.service
# # /etc/systemd/system/log-write-stats.timer files
# # systemctl enable log-write-stats.timer && systemctl start log-write-stats.timer

/bin/awk -v ORS=" " 'BEGIN {print strftime("%Y-%m-%d %H:%M:%S Written:")} /sd|mmcblk1p/{ split( "B KB MB GB TB PB EB" , v ); s=1; t=$10*512; while( t>1024 ){ t/=1024; s++ } printf ("%s [%.3g %s] ", $3, t, v[s] ) } END {print "\n"}' /proc/diskstats >> /var/log/disk-write-stats.log

log-write-stats.service

[Unit]
Description=Log amount of data written for mmcblk1* partitions and sd* devices

[Service]
Type=oneshot
ExecStart=/usr/bin/log-write-stats.sh

log-write-stats.timer

[Unit]
Description=Log /proc/diskstat written sectors value for mmcblk1* partitions and sd* devices daily
Requires=log-write-stats.service

[Timer]
OnCalendar=*-*-* 4:00:00
Persistent=true

[Install]
WantedBy=timers.target