RPi Configuring Watchdog and Hard Drive Auto-Sleep

• rpi 3b watchdog
• 硬盘闲置自动休眠

请依据CPU型号修改watchdog设备

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hdparm

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安装hdparm（略）

测试hdparm

hdparm链接

sudo hdparm -y /dev/sda1

如果没有报错就支持

sudo hdparm -I /dev/sda1|grep cache

如果看到有”*“就支持缓存

编辑hdparm

sudo nano /etc/hdparm.conf

加入

/dev/sda1 {
write_cache = on
spindown_time = 120
}

如果不支持缓存就不要加入write_cache那行

下面延时计算是 无操作休眠时间(分钟)*60/5

watchdog

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安装watchdog（略）

载入watchdog

sudo modprobe bcm2835_wdt
sudo nano /etc/modules
bcm2835_wdt

编辑配置

sudo /etc/watchdog.conf

修改

max-load-1=24
watchdog-device = /dev/watchdog
watchdog-timeout=20
temperature-sensor      = /sys/class/thermal/thermal_zone0/temp
max-temperature = 85000

启动

sudo systemctl enable watchdog.service
sudo chkconfig watchdog on

附赠一个fork bomb

:(){ :|: & };:

• rpi 3b watchdog
• Hard drive idle auto-sleep

Please modify the watchdog device according to your CPU model

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hdparm

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Install hdparm (omitted)

Test hdparm

hdparm link

sudo hdparm -y /dev/sda1

If there is no error, it is supported.

sudo hdparm -I /dev/sda1|grep cache

If you see “*“, cache is supported.

Edit hdparm

sudo nano /etc/hdparm.conf

Add

/dev/sda1 {
write_cache = on
spindown_time = 120
}

If cache is not supported, do not add the write_cache line.

The delay calculation below is: idle sleep time (minutes) * 60 / 5

watchdog

---

Install watchdog (omitted)

Load watchdog

sudo modprobe bcm2835_wdt
sudo nano /etc/modules
bcm2835_wdt

Edit configuration

sudo /etc/watchdog.conf

Modify

max-load-1=24
watchdog-device = /dev/watchdog
watchdog-timeout=20
temperature-sensor      = /sys/class/thermal/thermal_zone0/temp
max-temperature = 85000

Start

sudo systemctl enable watchdog.service
sudo chkconfig watchdog on

Bonus: A fork bomb

:(){ :|: & };: