Large_izone KVM testing on CentOS Linux 7 via the Phoronix Test Suite. Large_Disk_Izone: Processor: 4 x Intel Xeon E312xx (Sandy Bridge) @ 2.60GHz (4 Cores), Motherboard: OpenStack Foundation Nova v2014.2.3, Memory: 8192MB, Disk: 79GB OS: CentOS Linux 7, Kernel: 3.10.0-229.14.1.el7.x86_64 (x86_64), Compiler: GCC 4.8.3 20140911, File-System: ext4, Screen Resolution: 1024x768, System Layer: KVM IOzone 3.405 Record Size: 4Kb - File Size: 512MB - Disk Test: Read Performance MB/s > Higher Is Better Large_Disk_Izone . 3101.53 |=================================================== IOzone 3.405 Record Size: 4Kb - File Size: 512MB - Disk Test: Write Performance MB/s > Higher Is Better Large_Disk_Izone . 458.23 |====================================================