openstack disk io: Processor: QEMU Virtual 1.5.3 @ 2.49GHz (1 Core), Motherboard: Fedora OpenStack Nova, Memory: 2048MB, Disk: 5GB OS: CentOS 6.5, Kernel: 2.6.32-431.el6.x86_64 (x86_64), Compiler: GCC 4.4.7 20120313, File-System: ext4, System Layer: QEMU 1.5.3 IOzone 3.405 Record Size: 1MB - File Size: 2GB - Disk Test: Read Performance MB/s > Higher Is Better io . 75.32 |=================================================================== IOzone 3.405 Record Size: 4Kb - File Size: 2GB - Disk Test: Read Performance MB/s > Higher Is Better io . 69.44 |=================================================================== IOzone 3.405 Record Size: 1MB - File Size: 2GB - Disk Test: Write Performance MB/s > Higher Is Better io . 20.93 |=================================================================== IOzone 3.405 Record Size: 4Kb - File Size: 2GB - Disk Test: Write Performance MB/s > Higher Is Better io . 24.09 |=================================================================== IOzone 3.405 Record Size: 64Kb - File Size: 2GB - Disk Test: Read Performance MB/s > Higher Is Better io . 74.61 |=================================================================== IOzone 3.405 Record Size: 64Kb - File Size: 2GB - Disk Test: Write Performance MB/s > Higher Is Better io . 21.31 |===================================================================