Linux test Drive Read and write speed

Test Drive read/write speed tools/materials with/dev/zero and/dev/null

• ubuntu14.04

• Dd

Baidu Experience: jingyan.baidu.com

Method/Step

2. 1

   First we need to understand/dev/null and/dev/zero two files, we open two files respectively,

   650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD read/write Speed "src="/HTTP/ c.hiphotos.baidu.com/exp/w=500/sign=a3251c48b01bb0518f24b328067bda77/ A1ec08fa513d269753bc183756fbb2fb4316d868.jpg "/> Step reading

4. 2

   The graph can see that null is an empty file, and zero is a non-display unlimited input file, never end, which means zero can be used as an infinite file to write to the hard disk, and Null is an infinite empty file can be understood as a garbage bin under Windows.

   650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD read/write Speed "src="/HTTP/ h.hiphotos.baidu.com/exp/w=500/sign=4dc2d359708da9774e2f862b8050f872/ 63d0f703918fa0ec0fa87467259759ee3d6ddb68.jpg "/> Step reading

6. 3

   Then we can use the DD command to test the speed, first create a test file under/var for testing use

   650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD read/write Speed "src="/HTTP/ g.hiphotos.baidu.com/exp/w=500/sign=bf536fcaf503738dde4a0c22831ab073/ 622762d0f703918fa6be2da0523d269759eec468.jpg "/> Step reading

8. 4

   Next, we write the infinite input in the/dev/zero to the test file via the DD command, and note that we use DD to make the timing with the time command.

   Time DD If=/dev/zero of=/var/test bs=8k count=1000000

   The result is 24 seconds of 333m,8.2g per second.

   650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD read/write Speed "src="/HTTP/ c.hiphotos.baidu.com/exp/w=500/sign=58bf0b2988d4b31cf03c94bbb7d7276f/ 42166d224f4a20a454712cad93529822720ed068.jpg "/> Step reading

10. 5

    Let's test the read speed again, and we'll use the DD command.

    Time DD if=/var/test of=/dev/null bs=8k count=1000000

    650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD read/write Speed "src="/HTTP/ a.hiphotos.baidu.com/exp/w=500/sign=a1b69d5478ec54e741ec1a1e89399bfd/ D009b3de9c82d1584c3649db830a19d8bc3e4227.jpg "/> Step reading

12. 6

    To understand the above, we can be used to test read and write speed, we create a test1 file in/tmp, with the DD command to write data in the test test1.

    Time DD if=/var/test of=/tmp/test1 bs=8k count=1000000

    650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD read/write Speed "src="/HTTP/ g.hiphotos.baidu.com/exp/w=500/sign=7f601c5b223fb80e0cd161d706d02ffb/ 574e9258d109b3dee20bf402cfbf6c81800a4c27.jpg "/> Step reading

    650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD read/write Speed "src="/HTTP/ c.hiphotos.baidu.com/exp/w=500/sign=847d22522b381f309e198da999004c67/ 730e0cf3d7ca7bcb1014d745bd096b63f624a868.jpg "/> Step reading

14. 7

    So we can test the read and write speed of the hard drive.

    END

Linux test Drive Read and write speed