I've configured a pi with 2 dvb-t sticks, an Usb sata external drive and vdr. It actually works quite well, but some issues appear when mutiple (3 or more) recordings are active. Of course vdr itself puts a lot of load, but so does the SATA IO process as well.
Are there any ways to optimize the SATA IO? not higher speed but lower cpu consumption. I'm using ext4 on the sata disk, are there better options? big or small journal? fs options, etc?