DD command tests the read and write speed of Huawei Kunpeng & Hongshan solid state storage disk

dd The order is Linux A way to test the disk read / write rate ,dd The command test is a rough result , Because of the IO It's continuous IO, It's not random IO.
dd Test reading
Hongshan technology solid state storage raid6 ：
1. Write the test ： Test multiple direct write disks （ Don't walk the cache ）

[email protected]-9:/dbdata# dd if=/dev/zero of=testdm bs=32k count=200000 oflag=direct
 Recorded 200000+0  Read in of 
 Recorded 200000+0  Write 
6553600000 bytes (6.6 GB, 6.1 GiB) copied, 137.727 s, 47.6 MB/s

[email protected]-8:/dbdata$ dd if=/dev/zero of=testdm bs=32k count=200000 oflag=direct
 Recorded 200000+0  Read in of 
 Recorded 200000+0  Write 
6553600000 bytes (6.6 GB, 6.1 GiB) copied, 132.875 s, 49.3 MB/s

[email protected]-5:/dbdata# dd if=/dev/zero of=testdm bs=32k count=200000 oflag=direct
 Recorded 200000+0  Read in of 
 Recorded 200000+0  Write 
6553600000 bytes (6.6 GB, 6.1 GiB) copied, 141.924 s, 46.2 MB/s

dsync Mode reading

[email protected]:/dbdata# dd if=/dev/zero of=testdm1 bs=32k count=200000 oflag=dsync
 Recorded 200000+0  Read in of 
 Recorded 200000+0  Write 
6553600000 bytes (6.6 GB, 6.1 GiB) copied, 408.443 s, 16.0 MB/s

dsync Acer solid state storage on average 16MB/s about direct 45MB/s about

2. Walk cache read , Testing this rate makes little sense

[email protected]-8:/dbdata$ dd if=/dev/zero of=testdm1 bs=32k count=200000 
 Recorded 200000+0  Read in of 
 Recorded 200000+0  Write 
6553600000 bytes (6.6 GB, 6.1 GiB) copied, 1.75271 s, 3.7 GB/s

Huawei Kunpeng local disk raid6,22T The broader market
1. Write the test ： Test multiple

[email protected]:/data# dd if=/dev/zero of=testdm2 bs=32k count=100000 oflag=direct 
  Recorded 100000+0  Read in of 
 Recorded 100000+0  Write 
3276800000 bytes (3.3 GB, 3.1 GiB) copied, 385.103 s, 8.5 MB/s

[email protected]-5:/data# dd if=/dev/zero of=testdm1 bs=32k count=100000 oflag=direct
 Recorded 100000+0  Read in of 
 Recorded 100000+0  Write 
3276800000 bytes (3.3 GB, 3.1 GiB) copied, 24.6786 s, 133 MB/s

[email protected]-9:/data# rm -rf test 
[email protected]-9:/data# dd if=/dev/zero of=testdm bs=32k count=100000 oflag=direct
 Recorded 100000+0  Read in of 
 Recorded 100000+0  Write 
3276800000 bytes (3.3 GB, 3.1 GiB) copied, 21.5395 s, 152 MB/s

[email protected]-5:/data# dd if=/dev/zero of=testdm1 bs=32k count=100000 oflag=dsync
 Recorded 100000+0  Read in of 
 Recorded 100000+0  Write 
3276800000 bytes (3.3 GB, 3.1 GiB) copied, 65.0521 s, 50.4 MB/s

dsync Than direct About a third slower
I seriously doubt whether the first one doesn't have raid card

Measured by actual conditions