i've a 4 drive array connected via a PCIe SATA card.
per OS (opensuse) default, md RAID I/O performance was being limited by,
cat /proc/sys/dev/raid/speed_limit_min
1000
cat /proc/sys/dev/raid/speed_limit_max
200000
changing,
echo "dev.raid.speed_limit_min=100000" >> /etc/sysctl.conf
echo "dev.raid.speed_limit_max=600000" >> /etc/sysctl.conf
enabled full/best I/O throughput.
does btrfs have a similar construct that I need to set/tweak for
maximum I/O throughput?
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