Простите, ошибся с командой про место, выполните пожалуйста:
df -h
Настройки сохранения в историю верны. Глянем в базу:
для начала поставим sqlite
apt install sqlite3 -y
Потом посмотрим количество записей по контролам:
echo "select count(CHANNEL), (select device from channels where channels.int_id=data.channel) as DEVICE, (select control from channels where channels.int_id=data.channel) as CHANNEL from data group by CHANNEL;" | sqlite3 /mnt/data/var/lib/wirenboard/db/data.db
Ну и “последние” записи в базу:
echo "select uid, value, (select device from channels where channels.int_id=data.channel) as DEVICE, (select control from channels where channels.int_id=data.channel) as CHANNEL from data order by uid DESC limit 20;" | sqlite3 /mnt/data/var/lib/wirenboard/db/data.db