Raspberry Pi

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Contents

Cockbook

My collection of hints, tips and tricks (supporting my memory and maybe also helping others).

External USB drives

  • Install ntfs-3g if you need write access to ntfs file systems
  • How to increase performance?

udevil

  • exmaple for manual mounting: 
udevil mount /dev/sda1
  • my build-steps (maybe there's a simpler way, but this worked...):
    • download 0.4.3/udevil_0.4.3-1_all.deb from https://github.com/IgnorantGuru/udevil/tree/pkg, e.g. using wget
    • extract deb-package via ar vx udevil_0.4.3-1_all.deb
    • extract data archive tar xzvf data.tar.gz
    • change to tar usr/share/devil/src
    • untar tar xvfJ udevil-current.tar.xz
    • cd udevil-0.4.3
    • mv distros/debian
    • execute dpkg-buildpackage
    • If all required packages are installed, this results in udevil_0.4.3-1_armhf.deb. If the build fails due to missing packages, install the missing packages, and re-do the dpkg-buildpackage step
    • Install via sudo dpkg -i udevil_0.4.3-1_armhf.deb

Samba server / NAS

  • Slow disc performance?
    • see 'Slow USB drives' above
    • use Raspbian, etc without GUI to get as much CPU power for file-transfer as possible (OpenELEC or RaspBMC constantly use about 10-20% CPU load when idle, use top to check!)

RRD tool and cron usage

  • Reduce number of disk writes (SD card) when using running cron jobs

Misc Q&A

  • Q: Does Raspberry support WOL?
A: No: the Ethernet chip is connected via USB (http://www.raspberrypi.org/forum/viewtopic.php?f=53&t=39714)
  • Q: The new password is to short, or too simple
A: Try adjusting the PAM settings in /etc/pam.d/common-password:
  • remove the 'obscure' setting for pam_unix.so, and add your desired minimum length (e.g. minlen=2) 
 password        [success=1 default=ignore]      pam_unix.so sha512 minlen=2
!! This is not recommended if your box is connected to the internet or if it contains private data noone should know!!
But it's nice for testing (if you cannot or do not want to use auto-login.)
  • Q: How to configure static IP?
A: In /etc/network/interfaces: 
 iface eth0 inet static
   address 192.168.0.31
   netmask 255.255.255.0
   gateway 192.168.0.1
  • Q: How to read core temperature, etc?
A: vcgencmd: 
 vcgencmd measure_temp
 vcgencmd measure_clock arm
  • External USB HDD spin down
    • hdparm does not work with my WD Elements (SG_IO: bad host status: 0x7)
    • hd-idle works: 
hd-idle -a sda -i 600
for details, see for example http://blog.is-a-geek.org/festplatten-in-den-standby-modus-versetzen-unter-ubuntu-desktopserver-mit-hd-idle (German)
  • Q: How to avoid update of a certain package?
A: Put package on hold ([2] (German)): 
echo <paketname> "hold" | dpkg --set-selections

Useful stuff

Things I want to (or might) try sometime

  • Explore overclocking limits of my RaspBerry - currently I'm using medium set via raspi-config
--> Raspberry Pi Stress Tests
  • NAS/Samba
  • try adjusting 'socket options' in (/etc/samba/smb.conf) to increase NAS performance: some websites recommend to disable the 'socket options', some recommend to set: 
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=65536 SO_SNDBUF=65536
  • adjust memory split - smaller GPU memory for server
  • ext4 vs ntfs for storage drive
  • nfs [3] vs samba

Some links

Project sites

Blogs, forums, etc

Misc

Manuals

to be continued ...

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