How to protect the harddisk through APS

This page tells you how to make the Active Protection System work under Linux to protect your harddrive from damage in case of a notebook drop or other kind of impact while it is running. Specific instructions for Fedora can be found here. How APS works in Linux APS in Linux consists of four components on the software side: The HDAPS driver (included in recent kernels). It exports a sysfs interface providing the acceleration values. The hdaps_protect disk protection kernel patch, which exports a sysfs interface that enables an ide or sata disk to be protected by a userspace process. The hdapsd disk protection userspace daemon. It monitors the acceleration values through the HDAPS interface and automatically initiates disk protection through the hdaps_protect interface - given that the movement exceeds a user specified threshold. Optional: the khdapsmonitor KDE System Tray applet or khdapsmon KDE System Tray applet or the gnome-hdaps-applet. These applets provide a visual indication of the disk protection status and also a graphical interface for adjusting configuration options for hdapsd.

Installation

As mentioned above, the hdaps kernel driver found in recent kernels is only responsible for reading the accelerometer data and exporting it through the sysfs interface.

In order to use this information to protect the disk, some additional steps are required.

• Download and build the latest hdaps_protect disk protection kernel patches.
• Enable the drivers in the kernel (requires kernel rebuild).
• Download, build and configure the hdapsd userspace daemon.
• Download and build one of the applets to get a real-time representation of the disk protection status.

Getting the files

Latest Sources	hdaps_protect, hdapsd and the gnome-hdaps-applet: http://www.dresco.co.uk/hdaps khdapsmon: http://www.oakcourt.dyndns.org/projects/khdapsmon/
Fedora	see instructions here kernel RPM packages including hdaps_protect: http://www.dresco.co.uk/hdaps/ kernel RPM packages including hdaps_protect and Software Suspend 2: http://mhensler.de/swsusp/download/yum/development/fc5/ (build 2084_2 and up)
Gentoo	hdapsd ebuild: http://bugs.gentoo.org/show_bug.cgi?id=119845 khdapsmon ebuild: http://bugs.gentoo.org/show_bug.cgi?id=124175

Adding kernel support

A kernel patch is required for disk head parking and queue freezing.

Manually patching and compiling a kernel

As root, do:

# cd /usr/src/linux

# patch -p1 < ~/hdaps_protect.20060409.patch

# make clean

# make

# make modules_install

Installing hdapsd

Manual compilation from source

• Download the hdapsd sources (see above)
• Compile using # gcc -o hdapsd hdapsd-*.c
• Run # ./hdapsd -d sda -s 12 -a (replace sda with your hard disk device; run # ./hdapsd without arguments for help)

Gentoo

Gentoo users can try the ebuild attached to gentoo bug 119845.

NOTE!

hdapsd was added to the official portage tree on the 26th June 2006.

• Add hdapsd support in your kernel: device drivers -> hardware monitoring -> ... (you need it as a module if you want to use tp_smapi and hdaps, see Tp_smapi)
• Download the ebuild, use same ebuild date as the kernel-patch.
• Make known the portage an extern ebuild path and add the following line to /etc/make.conf:

PORTDIR_OVERLAY="/usr/local/portage/" (or any other location)

• Create directory /usr/local/portage and /usr/local/portage/app-laptop/
• Copy the downloaded ebuild to /usr/local/portage/app-laptop (/usr/local/portage/app-laptop/hdapsd should now exists)
• Make portage known the new ebuild and creat digist with:

# ebuild /usr/local/portage/app-laptop/hdapsd/hdapsd-20060326.ebuild digest

• Optional: Copy source file to portage distfiles (if no internet connection is available):

# cp hdapsd-20060326.c /usr/portage/distfiles

• Accept the x86 keyword for this package: # echo "app-laptop/hdapsd ~x86" >> /etc/portage/package.keywords
• Install hdapsd with: # emerge hdapsd.
• Edit /etc/conf.d/hdapsd (change your harddrive if neccessary: mine is sda, and change the value from 5, 5 is to sensitive, 12 is a good value in my opinion).
• start deamon with: # /etc/init.d/hdapsd start
• Optional: add to default runlevel: # rc-update add hdapsd default, rc-update add hdapsd battery

Write an eMail to abartel[äd]htwm.de, if you want to get my hdapsd-20060326.ebuild and please upload it.

Building an applet

hdaps-gl

• Make sure you have installed hdaps [and loaded] and ?opengl?
• Download hdaps-gl-0.0.5 from the web.
• Extract files to /opt/hdaps-gl.
• # make
• Start the applet: # ./hdaps-gl

khdapsmon

This application uses GNU autotools, so building it is the same as any other autotooled program:

• extract the source somewhere and change to that directory,
• run # ./configure && make && make install.

See above for Debian packages and a Gentoo ebuild.

Troubleshooting

See the Problem with APS harddisk parking page for troubleshooting APS issues.

NOTE!

If you use tp_smapi, remember to include the option HDAPS=1 when installing tp_smapi. Also, you might need to build the hdaps driver as module.

Further Information

• Additonal information and support is available through the hdaps-devel mailinglist and its archive.