drbd 2 x Intel Xeon E5-2420 v2 testing with a Dell 08DM12 (2.9.0 BIOS) and Matrox G200eR2 on CentOS Linux 7 via the Phoronix Test Suite. DRBD protocol C: Processor: 2 x Intel Xeon E5-2420 v2 @ 2.70GHz (12 Cores / 24 Threads), Motherboard: Dell 08DM12 (2.9.0 BIOS), Chipset: Intel Xeon E7 v2/Xeon, Memory: 2 x 16384 MB DDR3-1600MT/s M393B2G70DB0-YK0, Disk: 299GB PERC H710P + 240GB INTEL SSDSC2BW24, Graphics: Matrox G200eR2, Network: 2 x Broadcom NetXtreme BCM5720 2-port PCIe + 2 x Intel 82599ES 10-Gigabit SFI/SFP+ OS: CentOS Linux 7, Kernel: 3.10.0-1127.el7.x86_64 (x86_64), Compiler: GCC 4.8.5 20150623, File-System: xfs, Screen Resolution: 1024x768 DRBD protocol B: Processor: 2 x Intel Xeon E5-2420 v2 @ 2.70GHz (12 Cores / 24 Threads), Motherboard: Dell 08DM12 (2.9.0 BIOS), Chipset: Intel Xeon E7 v2/Xeon, Memory: 2 x 16384 MB DDR3-1600MT/s M393B2G70DB0-YK0, Disk: 299GB PERC H710P + 240GB INTEL SSDSC2BW24, Graphics: Matrox G200eR2, Network: 2 x Broadcom NetXtreme BCM5720 2-port PCIe + 2 x Intel 82599ES 10-Gigabit SFI/SFP+ OS: CentOS Linux 7, Kernel: 3.10.0-1127.el7.x86_64 (x86_64), Compiler: GCC 4.8.5 20150623, File-System: xfs, Screen Resolution: 1024x768 DRBD protocol A: Processor: 2 x Intel Xeon E5-2420 v2 @ 2.70GHz (12 Cores / 24 Threads), Motherboard: Dell 08DM12 (2.9.0 BIOS), Chipset: Intel Xeon E7 v2/Xeon, Memory: 2 x 16384 MB DDR3-1600MT/s M393B2G70DB0-YK0, Disk: 299GB PERC H710P + 240GB INTEL SSDSC2BW24, Graphics: Matrox G200eR2, Network: 2 x Broadcom NetXtreme BCM5720 2-port PCIe + 2 x Intel 82599ES 10-Gigabit SFI/SFP+ OS: CentOS Linux 7, Kernel: 3.10.0-1127.el7.x86_64 (x86_64), Compiler: GCC 4.8.5 20150623, File-System: xfs, Screen Resolution: 1024x768 DRBD protocol C alone: Processor: 2 x Intel Xeon E5-2420 v2 @ 2.70GHz (12 Cores / 24 Threads), Motherboard: Dell 08DM12 (2.9.0 BIOS), Chipset: Intel Xeon E7 v2/Xeon, Memory: 2 x 16384 MB DDR3-1600MT/s M393B2G70DB0-YK0, Disk: 299GB PERC H710P + 240GB INTEL SSDSC2BW24, Graphics: Matrox G200eR2, Network: 2 x Broadcom NetXtreme BCM5720 2-port PCIe + 2 x Intel 82599ES 10-Gigabit SFI/SFP+ OS: CentOS Linux 7, Kernel: 3.10.0-1127.el7.x86_64 (x86_64), Compiler: GCC 4.8.5 20150623, File-System: xfs, Screen Resolution: 1024x768 Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 4KB - Disk Target: Default Test Directory MB/s > Higher Is Better DRBD protocol C ....... 8.166 |================================================ DRBD protocol B ....... 7.791 |============================================== DRBD protocol A ....... 7.587 |============================================= DRBD protocol C alone . 7.951 |=============================================== Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 4KB - Disk Target: Default Test Directory IOPS > Higher Is Better DRBD protocol C ....... 2041 |================================================= DRBD protocol B ....... 1947 |=============================================== DRBD protocol A ....... 1896 |============================================== DRBD protocol C alone . 1987 |================================================ Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 16KB - Disk Target: Default Test Directory MB/s > Higher Is Better DRBD protocol C ....... 23.4 |================================================= DRBD protocol B ....... 22.9 |================================================ DRBD protocol A ....... 21.3 |============================================= DRBD protocol C alone . 21.4 |============================================= Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 16KB - Disk Target: Default Test Directory IOPS > Higher Is Better DRBD protocol C ....... 1500 |================================================= DRBD protocol B ....... 1469 |================================================ DRBD protocol A ....... 1361 |============================================ DRBD protocol C alone . 1370 |============================================= Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 64KB - Disk Target: Default Test Directory MB/s > Higher Is Better DRBD protocol C ....... 119 |================================== DRBD protocol B ....... 148 |========================================== DRBD protocol A ....... 159 |============================================= DRBD protocol C alone . 176 |================================================== Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 64KB - Disk Target: Default Test Directory IOPS > Higher Is Better DRBD protocol C ....... 1899 |================================= DRBD protocol B ....... 2366 |========================================= DRBD protocol A ....... 2536 |============================================ DRBD protocol C alone . 2816 |================================================= Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 128KB - Disk Target: Default Test Directory MB/s > Higher Is Better DRBD protocol C ....... 194 |============================================== DRBD protocol B ....... 200 |================================================ DRBD protocol A ....... 200 |================================================ DRBD protocol C alone . 209 |================================================== Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 128KB - Disk Target: Default Test Directory IOPS > Higher Is Better DRBD protocol C ....... 1550 |============================================= DRBD protocol B ....... 1597 |=============================================== DRBD protocol A ....... 1601 |=============================================== DRBD protocol C alone . 1672 |================================================= Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 512KB - Disk Target: Default Test Directory MB/s > Higher Is Better DRBD protocol C ....... 243 |=============================================== DRBD protocol B ....... 252 |================================================= DRBD protocol A ....... 247 |================================================ DRBD protocol C alone . 257 |================================================== Flexible IO Tester 3.18 Type: Random Write - Engine: Sync - Buffered: No - Direct: Yes - Block Size: 512KB - Disk Target: Default Test Directory IOPS > Higher Is Better DRBD protocol C ....... 486 |=============================================== DRBD protocol B ....... 504 |================================================= DRBD protocol A ....... 494 |================================================ DRBD protocol C alone . 514 |==================================================