RAID 6 阵列比我的 RAID 10 阵列快得多？

Question

为什么我的 RAID-6 胜过我的 RAID-10？

Synology 上带有 8x4TB RAID-10 的 Docker 容器：

[root@centos Files]# bonnie++ -d /Files/tmp -r 16G -s 32G -n 1 -f -b -u root
Using uid:0, gid:0.
Writing intelligently...done
Rewriting...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
centos          32G           454106  19 177752  12           336051  11 174.9   9
Latency                         637ms     437ms               271ms    1199ms
Version  1.97       ------Sequential Create------ --------Random Create--------
centos              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                  1    19   1 +++++ +++    24   2    19   1 +++++ +++    23   3
Latency               401ms      63us     177ms     177ms      19us     122ms
1.97,1.97,centos,1,1503010478,32G,,,,454106,19,177752,12,,,336051,11,174.9,9,1,,,,,19,1,+++++,+++,24,2,19,1,+++++,+++,23,3,,637ms,437ms,,271ms,1199ms,401ms,63us,177ms,177ms,19us,122ms

FreeNAS 6x4TB RAID-Z2，来自监狱的 RAID-6：

root@testjail:/ # bonnie++ -d /Files/tmp -r 16G -s 32G -n 1 -f -b -u root
Using uid:0, gid:0.
Writing intelligently...done
Rewriting...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
testjail        32G           1158187  63 850172  70           3130981  97  7888  90
Latency                         173ms   79669us             13285us     197ms
Version  1.97       ------Sequential Create------ --------Random Create--------
testjail            -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                  1 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
Latency             19728us      41us    2506us     102us      20us     154us
1.97,1.97,testjail,1,1503021586,32G,,,,1158187,63,850172,70,,,3130981,97,7888,90,1,,,,,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,,173ms,79669us,,13285us,197ms,19728us,41us,2506us,102us,20us,154us
root@testjail:/ #

规格：16GB DDR4（2133 vs 2400）

• Synology RS3617RPxs - Intel Xeon D-1521 - 8 x WDD Red 4TB in Raid 10 - Quad Core 2,2 (base) / 2,7 (turbo) GHz - 2 x 8 GB DDR4 ECC UDIMM
• FreeNAS VMware VM - 1 x 16GB 分配的 RAM（2x16GB 中） - 仅 16GB NVMe 引导盘 - 6x4TB 桌面驱动器 - 很难开始工作。

我的期望是 RAIDZ2 在美好的一天写入 ~400MB/秒，因为有些驱动器真的很旧，而 RAID10 阵列的写入速度为 ~750MB/秒。

但是raidz2 似乎快得令人难以置信，而raid10 似乎非常慢。

Answer 1

我建议使用deskspeed.exe来确保您向社区展示的数字。

这篇文章应该可以帮助您调整 Synology box

https://www.starwindsoftware.com/blog/synology-diskstation-ds916-turbocharged-with-starwind-virtual-san