lazerdye

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lazerdye reacted to zador.blood.stained in Cubieboard 2 unresponsive when swapping March 2, 2016

"48.4 sy 51.5 wa" on 3rd line partially answers your second and fourth questions - SATA interface on A20 is slow and inefficient, so swapping combined with running torrent client results in this - CPU is processing SATA requests and waiting for I/O operations (and if you have mechanical HDD, seek time when multiple programs access different files also affects this).

So in your case using swap on SATA is bad idea, using no swap (if possible), zram or swap on SD card may be better.
lazerdye reacted to Igor in ODroid XU4: nand-sata-install not using sda1 as root after reboot March 1, 2016

If you are in a need you can use this updated script:
https://github.com/igorpecovnik/lib/blob/master/scripts/nand-sata-install/usr/lib/nand-sata-install/nand-sata-install.sh
lazerdye reacted to Igor in ODroid XU4: nand-sata-install not using sda1 as root after reboot February 25, 2016

I think we haven't tested SATA installer on XU4 ... so it's possible that something important is missing from kernel. I can check and rebuild kernel in few days.
lazerdye reacted to martijn in Cubox-i (2gb) freezing after sustained use February 24, 2016

I had a similar problem with an olimex a20 board, ended up being the overclock that armbian applies.