== Configuration: == Node 1-12 on sb9 is an lv-67g. It has an edge boost pro as the boot disk and two samsung 840 PRO ssds in motherboard based hardware raid todo, implement changes from: http://dak1n1.com/blog/7-performance-tuning-intel-10gbe setting up fakeraid https://help.ubuntu.com/community/FakeRaidHowto setting up software raid https://raid.wiki.kernel.org/index.php/RAID_setup === Rebuilding with Asus Node === modprobe mlx4_en to bring up 10g card will test raid with 1,2,and 3 disks. == Commands used: == === Raid Creation === mdadm --create --verbose /dev/md0 --chunk=8 --level=stripe --raid-devices=2 /dev/sda /dev/sdb mdadm --misc --stop /dev/md0 === Write: === time sh -c "dd if=/dev/zero of=/mnt/bigfile bs=8k count=2000000 && sync" 2000000+0 records in 2000000+0 records out 16384000000 bytes (16 GB) copied, 15.7342 s, 1.0 GB/s real 0m16.021s user 0m0.644s sys 0m11.293s === Read: === time sh -c "dd if=/mnt/bigfile of=/dev/null bs=8k" 2000000+0 records in 2000000+0 records out 16384000000 bytes (16 GB) copied, 20.4297 s, 802 MB/s real 0m20.434s user 0m0.728s sys 0m9.849s == Test results for SSD raid == Single disk Write: 529 MB/s Single disk Read: 539 MB/s Fakeraid Write: 1.0 GB/s Fakeraid Read: 802 MB/s || |||| !FakeRaid |||| Software Raid || ||Block Size || Write || Read || Write || Read || || 4k || || || || || || 8k || 1.0 GB/s || 802 MB/s || 1.1 GB/s || 965 MB/s || || 16k || || || || || || 32k || || || || || || 64k || || || || || || 128k || || || 1.1 GB/s || 1.1 GB/s ||