cascade-snapshots
Test the effect of taking multiple cascaded snapshots on disk write performance. A 4G file is created between each snapshot.


Before Snapshots: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After 1st snapshot: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After 2nd snapshot: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After 3rd snapshot: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After 4th snapshot: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After 5th snapshot: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

During snapshot deletion: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After snapshot removal: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After snapshot removal 2 Tegile caching: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware

After file deletion: 

	Processor: Intel Xeon E5-2660 v3 @ 2.59GHz (1 Core), Motherboard: Intel 440BX (6.00 BIOS), Chipset: Intel 440BX/ZX/DX, Memory: 4096MB, Disk: 59GB Virtual disk, Graphics: llvmpipe 3968MB, Network: Intel 82545EM Gigabit

	OS: Ubuntu 18.04, Kernel: 4.15.0-22-generic (x86_64), OpenGL: 3.0 Mesa 18.0.0-rc5 (LLVM 6.0 256 bits), Compiler: GCC 7.3.0, File-System: ext4, Screen Resolution: 1176x885, System Layer: VMware


AIO-Stress 0.21
Test: Random Write
MB/s > Higher Is Better
Before Snapshots ........................ 510.35 |=============================
After 1st snapshot ...................... 257.92 |===============
After 2nd snapshot ...................... 342.21 |===================
After 3rd snapshot ...................... 91.85  |=====
After 4th snapshot ...................... 157.38 |=========
After 5th snapshot ...................... 115.58 |=======
During snapshot deletion ................ 52.95  |===
After snapshot removal .................. 390.82 |======================
After snapshot removal 2 Tegile caching . 407.92 |=======================
After file deletion ..................... 507.06 |=============================