aio just testing 4k: Processor: Intel Xeon E3-1276 v3 @ 4.00GHz (8 Cores), Motherboard: Supermicro X10SAE v1.01, Chipset: Intel Xeon E3-1200 v3 DRAM, Memory: 32768MB, Disk: 4 x 3001GB Western Digital WD30EFRX-68A + 2 x 3001GB Western Digital WD30EFRX-68E, Graphics: Intel Xeon E3-1200 v3 IGP (1250MHz), Audio: Intel Xeon E3-1200 v3/4th, Monitor: LCD1735NXM, Network: Intel Connection I217-LM OS: CentOS Linux 7, Kernel: 3.10.0-229.1.2.el7.x86_64 (x86_64), Display Server: X Server 1.15.0, Display Driver: intel 2.99.916, OpenGL: 3.3 Mesa 10.2.7, Compiler: GCC 4.8.3 20140911, File-System: ext4, Screen Resolution: 1280x1024 AIO-Stress 0.21 Test: Random Write MB/s > Higher Is Better 4k . 3754.84 |=================================================================