jg-01 VM on BTRFS on LVM on spinning disk with ssd cache local-ssd: Processor: Intel Core i7-2600K @ 3.80GHz (8 Cores), Motherboard: ASUS P8Z68-V LX, Chipset: Intel 2nd Generation Core Family DRAM, Memory: 20480MB, Disk: 2 x 1500GB Seagate ST31500341AS + 60GB Patriot Pyro, Graphics: ASUS NVIDIA GeForce GTX 560 1024MB (810/2004MHz), Audio: Realtek ALC887-VD, Network: Realtek RTL8111/8168/8411 OS: Ubuntu 15.10, Kernel: 4.2.0-34-generic (x86_64), Desktop: Xfce 4.12, Display Server: X Server 1.17.2, Display Driver: NVIDIA 352.63, OpenGL: 4.4.0, Compiler: GCC 5.2.1 20151010, File-System: ext4, Screen Resolution: 1920x1080 vm-btrfs-hdd-ssd-cache: Processor: 4 x Westmere E56xx/L56xx/X56xx (Nehalem-C) @ 3.41GHz (4 Cores), Motherboard: QEMU Standard PC (i440FX + PIIX 1996), Chipset: Intel 440FX- 82441FX PMC, Memory: 4096MB, Disk: 193GB, Graphics: Red Hat QXL paravirtual graphic card, Audio: QEMU ID 22, Network: Red Hat Virtio device OS: Ubuntu 15.10, Kernel: 4.2.0-34-generic (x86_64), Display Driver: modesetting 1.17.2, Compiler: GCC 5.2.1 20151010, File-System: ext4, Screen Resolution: 1024x768, System Layer: KVM Flexible IO Tester 2.1.11 Test: Intel IOMeter File Server Access Pattern - Disk Target: Default Test Directory Seconds (Run Time) < Lower Is Better local-ssd . 179.29 |=========================================================== IOzone 3.405 Record Size: 1MB - File Size: 4GB - Disk Test: Read Performance MB/s > Higher Is Better local-ssd .............. 7323.83 |============================================= vm-btrfs-hdd-ssd-cache . 1600.68 |========== IOzone 3.405 Record Size: 4Kb - File Size: 4GB - Disk Test: Read Performance MB/s > Higher Is Better local-ssd .............. 6013.77 |============================================= vm-btrfs-hdd-ssd-cache . 1635.22 |============ IOzone 3.405 Record Size: 1MB - File Size: 4GB - Disk Test: Write Performance MB/s > Higher Is Better local-ssd .............. 240.47 |============================================== vm-btrfs-hdd-ssd-cache . 193.09 |===================================== IOzone 3.405 Record Size: 4Kb - File Size: 4GB - Disk Test: Write Performance MB/s > Higher Is Better local-ssd .............. 238.16 |============================================== vm-btrfs-hdd-ssd-cache . 221.66 |=========================================== IOzone 3.405 Record Size: 64Kb - File Size: 4GB - Disk Test: Read Performance MB/s > Higher Is Better local-ssd .............. 7374.10 |============================================= vm-btrfs-hdd-ssd-cache . 1690.79 |========== IOzone 3.405 Record Size: 64Kb - File Size: 4GB - Disk Test: Write Performance MB/s > Higher Is Better local-ssd .............. 240.44 |============================================== vm-btrfs-hdd-ssd-cache . 232.86 |============================================= Unpacking The Linux Kernel linux-2.6.32.tar.bz2 Seconds < Lower Is Better local-ssd .............. 8.06 |========================================= vm-btrfs-hdd-ssd-cache . 9.51 |================================================