iozone-no-discard KVM QEMU 1.5.3 testing on CentOS Linux 7 via the Phoronix Test Suite. iozone-no-discard: Processor: 2 x QEMU Virtual 1.5.3 @ 2.27GHz (2 Cores), Motherboard: Red Hat KVM (0.5.1 BIOS), Chipset: Intel 440FX- 82441FX PMC, Memory: 1 x 514 MB RAM, Disk: 17GB, Graphics: Cirrus Logic GD 5446, Network: Red Hat Virtio device OS: CentOS Linux 7, Kernel: 3.10.0-693.17.1.el7.bug14347.centos.plus.x86_64 (x86_64), Compiler: GCC 4.8.5 20150623, File-System: ext4, System Layer: KVM QEMU 1.5.3 IOzone 3.465 Record Size: 1MB - File Size: 8GB - Disk Test: Read Performance MB/s > Higher Is Better iozone-no-discard . 104.52 |=================================================== IOzone 3.465 Record Size: 4Kb - File Size: 8GB - Disk Test: Read Performance MB/s > Higher Is Better iozone-no-discard . 100.12 |=================================================== IOzone 3.465 Record Size: 1MB - File Size: 8GB - Disk Test: Write Performance MB/s > Higher Is Better iozone-no-discard . 96.56 |==================================================== IOzone 3.465 Record Size: 4Kb - File Size: 8GB - Disk Test: Write Performance MB/s > Higher Is Better iozone-no-discard . 87.16 |==================================================== IOzone 3.465 Record Size: 64Kb - File Size: 8GB - Disk Test: Read Performance MB/s > Higher Is Better iozone-no-discard . 103.13 |=================================================== IOzone 3.465 Record Size: 64Kb - File Size: 8GB - Disk Test: Write Performance MB/s > Higher Is Better iozone-no-discard . 101.53 |===================================================