Large_IOZONE_rite KVM testing on CentOS Linux 7 via the Phoronix Test Suite. Large_IOZONE_Write: 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: 64Kb - File Size: 2GB - Disk Test: Write Performance MB/s > Higher Is Better Large_IOZONE_Write . 890.69 |================================================== IOzone 3.405 Record Size: 64Kb - File Size: 4GB - Disk Test: Write Performance MB/s > Higher Is Better Large_IOZONE_Write . 1075.99 |================================================= IOzone 3.405 Record Size: 64Kb - File Size: 8GB - Disk Test: Write Performance MB/s > Higher Is Better Large_IOZONE_Write . 689.02 |================================================== IOzone 3.405 Record Size: 64Kb - File Size: 512MB - Disk Test: Write Performance MB/s > Higher Is Better Large_IOZONE_Write . 666.22 |==================================================