Hp
P840/4gb fbwc 上 SSD RAID 10 的寫入性能問題
我有一個使用 P840/4gb fbwc RAID 控制器的 RAID10 陣列中的 4x512GB Samsung SSD 850 的新系統。當我從網路（10 Gbit/s）下載文件時，寫入速度不是很好。我嘗試使用 wget 下載一個 1000MB 的文件：
Saving to: ‘1000mb.bin’ 1000mb.bin 100%[=========================================================================================================>] 1000M 383MB/s in 2.6s寫入速度 383Mbyte/s
編輯：將相同的文件下載到 /dev/null 時，我得到了 10Gbit/s 的全速。案例是下載和儲存該大小的文件。
此外，當我嘗試使用 dd 寫入文件時，速度與塊大小 512byte 相同：
dd if=/dev/zero of=bench.bin bs=512 count=10000K 10240000+0 records in 10240000+0 records out 5242880000 bytes (5.2 GB) copied, 14.6632 s, 358 MB/s然而，塊大小 4k 提供了更好的性能：
dd if=/dev/zero of=bench.bin bs=4k count=1000K 1024000+0 records in 1024000+0 records out 4194304000 bytes (4.2 GB) copied, 3.02447 s, 1.4 GB/s所以我嘗試了各種不同的設置，比如記憶體、SSD 智能路徑等。但我沒有看到太大的不同。任何想法如何提高寫入速度？
控制器的目前設置：
Smart Array P840 in Slot 1 Bus Interface: PCI Slot: 1 Serial Number: Cache Serial Number: RAID 6 (ADG) Status: Enabled Controller Status: OK Hardware Revision: B Firmware Version: 4.52 Rebuild Priority: High Expand Priority: Medium Surface Scan Delay: 3 secs Surface Scan Mode: Idle Parallel Surface Scan Supported: Yes Current Parallel Surface Scan Count: 1 Max Parallel Surface Scan Count: 16 Queue Depth: Automatic Monitor and Performance Delay: 60 min Elevator Sort: Enabled Degraded Performance Optimization: Disabled Inconsistency Repair Policy: Disabled Wait for Cache Room: Disabled Surface Analysis Inconsistency Notification: Disabled Post Prompt Timeout: 15 secs Cache Board Present: True Cache Status: OK Cache Ratio: 10% Read / 90% Write Drive Write Cache: Disabled Total Cache Size: 4.0 GB Total Cache Memory Available: 3.8 GB No-Battery Write Cache: Disabled SSD Caching RAID5 WriteBack Enabled: True SSD Caching Version: 2 Cache Backup Power Source: Batteries Battery/Capacitor Count: 1 Battery/Capacitor Status: OK SATA NCQ Supported: True Spare Activation Mode: Activate on physical drive failure (default) Controller Temperature (C): 44 Cache Module Temperature (C): 37 Number of Ports: 2 Internal only Encryption: Disabled Express Local Encryption: False Driver Name: hpsa Driver Version: 3.4.4 Driver Supports HP SSD Smart Path: True PCI Address (Domain:Bus:Device.Function): 0000:06:00.0 Negotiated PCIe Data Rate: PCIe 3.0 x8 (7880 MB/s) Controller Mode: RAID Controller Mode Reboot: Not Required Latency Scheduler Setting: Disabled Current Power Mode: MaxPerformance Host Serial Number: Sanitize Erase Supported: False Primary Boot Volume: logicaldrive 1 Secondary Boot Volume: logicaldrive 2Physical Drives physicaldrive 2I:1:1 (port 2I:box 1:bay 1, Solid State SATA, 512.1 GB, OK) physicaldrive 2I:1:2 (port 2I:box 1:bay 2, Solid State SATA, 512.1 GB, OK) physicaldrive 2I:1:3 (port 2I:box 1:bay 3, Solid State SATA, 512.1 GB, OK) physicaldrive 2I:1:4 (port 2I:box 1:bay 4, Solid State SATA, 512.1 GB, OK) None attached Array: A Interface Type: Solid State SATA Unused Space: 0 MB (0.0%) Used Space: 1.9 TB (100.0%) Status: OK MultiDomain Status: OK Array Type: Data HP SSD Smart Path: disable Logical Drive: 1 Size: 953.8 GB Fault Tolerance: 1+0 Heads: 255 Sectors Per Track: 32 Cylinders: 65535 Strip Size: 256 KB Full Stripe Size: 512 KB Status: OK MultiDomain Status: OK Caching: Enabled Unique Identifier: Disk Name: /dev/sda Mount Points: /boot 487 MB Partition Number 2, / 14.0 GB Partition Number 7 OS Status: LOCKED Logical Drive Label: Mirror Group 1: physicaldrive 2I:1:1 (port 2I:box 1:bay 1, Solid State SATA, 512.1 GB, OK) physicaldrive 2I:1:2 (port 2I:box 1:bay 2, Solid State SATA, 512.1 GB, OK) Mirror Group 2: physicaldrive 2I:1:3 (port 2I:box 1:bay 3, Solid State SATA, 512.1 GB, OK) physicaldrive 2I:1:4 (port 2I:box 1:bay 4, Solid State SATA, 512.1 GB, OK) Drive Type: Data LD Acceleration Method: Controller Cache任何幫助表示讚賞:)
更新：我們通過從 ext4 切換到 xfs 實現了性能提升。感謝所有回答的人。
我建議將磁碟的 TagQue 增加到 256+。無論如何，應該理解 /dev/null 不需要中斷，而 SmartArray 的物理 IO 則需要。在您的範例中，具有 512B 塊大小的 380MB/s 生成 778,240 IOps。SA840 可以提供大約。基準配置 (24xSSD RAID0) 中 1M IO/s。概括一下：如果使用小塊，則不應期望高吞吐量 - 更改工具/設置以確保塊 128kB+ 用於在單個 SA840 上具有高達 5GB/s 的性能。