fioext4 Base VM Configuration ext4: Processor: Intel Xeon E312xx @ 3.20GHz (2 Cores), Motherboard: Bochs, Chipset: Intel 440FX- 82441FX PMC, Memory: 1 x 6144 MB RAM, Disk: 28GB, Graphics: Device 1234:1111, Monitor: Bochs Screen, Network: Red Hat Virtio device OS: Ubuntu 13.10, Kernel: 3.11.0-15-generic (x86_64), Desktop: Unity 7.1.2, Display Driver: modesetting 0.8.0, Compiler: GCC 4.8, File-System: ext4, Screen Resolution: 800x600 sdfs: Processor: Intel Xeon E312xx @ 3.20GHz (2 Cores), Motherboard: Bochs, Chipset: Intel 440FX- 82441FX PMC, Memory: 1 x 6144 MB RAM, Disk: 28GB, Graphics: Device 1234:1111, Monitor: Bochs Screen, Network: Red Hat Virtio device OS: Ubuntu 13.10, Kernel: 3.11.0-15-generic (x86_64), Desktop: Unity 7.1.2, Display Driver: modesetting 0.8.0, Compiler: GCC 4.8, File-System: fuseblk, Screen Resolution: 800x600 Flexible IO Tester 1.57 Test: Intel IOMeter File Server Access Pattern Seconds (Run Time) < Lower Is Better ext4 . 51.14 |============================================= sdfs . 73.33 |=================================================================