Raspberry Pi, Raspbmc, NFS, MySQL

26/03/2013 – 23:05

Recently I acquired a Rasperry Pi device, mainly because I was never really satisfied with the implementations I had used before (24p stutter, problems with energy saving mode etc..). Some weeks ago a friend of mine had purchased an android-based USB stick with HDMI output, which he tried to use as media player, and that had me rethinking. Afer some research I ended up with the Pi, mainly because I learned from my friend’s android stick: it’s not the hardware that counts, its whether the software is optimized for the hardware and how seemless the user experience gets.

Using XBMC for years now I decided to give RASPBMC a try, a distribution specifically developed for the Pi, running XBMC only. I found it to run astoundishingly fluid, the only grief I had was that (because I exclusivly use 720p and 1080p files) the buffering when starting a video or jumping inside the video took quite some time (5 seconds)
All is not lost though. With a history as overclocker (soldered my first Athlon Slot A from 500MHz to 850MHz) I naturally looked for the headroom on the Pi. People reported 900-1000MHz instead of the standard 700MHz. I gave 880MHz a try, that was fine for a day, then the other day while watching a bluray file it got stuck, after reboot I had filesystem corruption on the SD card. >Reinstall
I found out that overclocking a setup with a SD card installation was prone to corruption on hard overclocks. Well, didn’t get that earlier. Installation to USB was the way to go people said, I tried that using a USB 3.0 8GB stick (60MB/s read, 25MB/s write), the system was much quicker booting and especially inside raspbmc fluidness increased.
880MHz was also just fine now!
For some time I sticked to “file mode”, navigating to directories with video files. Then i activated library mode – uuh, aah, that is slow. Thumbnail generation and sql load brought the Pi to its knees.

From earlier Windows/XBMC times I knew the DB part can be outssourced to a mysql server. Well, I already had one running (VM on HyperV host), so I added a advancedsettings.xml to the Pi, voila.
Library mode was now nearly as quick as file mode.

Still: RASPBMC added a option to install to NFS shares, and users reported that installation method to be even more responsive (and overclockable). I gave Services for UNIX under Windows server a try, it installed just fine, but I didn’t manage to boot it from the share (block init failed etc, VSync issues…). I then setup a FreeNAS VM on my HyperV host, added a 8GB VHD file (SSD based) to the machine, created a ZFS share and NFS export on it. Raspbmc installed and ran without problems on first try. I instantly took a ZFS snapshot of the state, and set daily ZFS snapshots to be done inside FreeNAS. Inside FreeNAs i can now add additional shares for further Pis, and have them root files all in one place while no more requiring a big or fast SD card or USB stick to run a Pi.


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