1. Grab another 8GB of memory
2. Grab a $30 intel network card
3. to test write speed run this on a dataset that has compression disabled.
Code:dd if=/dev/zero of=./21GB.dat bs=128k count=163840
4. to test read speed run this on a dataset that has compression disabled and also has the 21GB file created in the previous test.
Code:dd of=/dev/null if=./21GB.dat bs=128k count=163840
Don't expect anything magical since your hardware is very 'iffy' and not recommended for freenas. For best results stick to recommended server hardware.
I don't believe your mobo is ECC compatible.
That's why I suggested you look at our recommendations.
Also, any idea why I always get this strange drive usage -- it only happens to this one drive:
