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

Commands used:

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

Fakeraid Write: 1.0 GB/s

Fakeraid Read: 802 MB/s