Centos下測試硬碟讀寫速度

這是在伺服器上，讀寫超快。

寫速度

$dd if=/dev/zero bs=1k count=1000000 of=1Gb.file

1000000+0 records in
1000000+0 records out
1024000000 bytes (1.0 GB) copied, 5.13676 seconds, 199 MB/s

 

讀速度

$dd if=1Gb.file bs=64k |dd of=/dev/null

[haibo@localhost ~]$ dd if=1Gb.file bs=64k |dd of=/dev/null
15625+0 records in
15625+0 records out
1024000000 bytes (1.0 GB) copied, 6.37813 seconds, 161 MB/s
2000000+0 records in
2000000+0 records out
1024000000 bytes (1.0 GB) copied, 6.37891 seconds, 161 MB/s

 

讀寫速度

$dd if=1Gb.file of=2Gb.file bs=64k

15625+0 records in
15625+0 records out
1024000000 bytes (1.0 GB) copied, 2.21364 seconds, 463 MB/

 

 

這是在本地的虛擬機器上

[root@localhost ~]# dd if=/dev/zero bs=1k count=1000000 of=1Gb.file
1000000+0 records in
1000000+0 records out
1024000000 bytes (1.0 GB) copied, 39.6289 seconds, 25.8 MB/s
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# dd if=1Gb.file bs=64k |dd of=/dev/null
2000000+0 records in
2000000+0 records out
1024000000 bytes (1.0 GB) copied, 39.8982 seconds, 25.7 MB/s
15625+0 records in
15625+0 records out
1024000000 bytes (1.0 GB) copied, 39.9039 seconds, 25.7 MB/s
[root@localhost ~]# dd if=1Gb.file of=2Gb.file bs=64k
15625+0 records in
15625+0 records out
1024000000 bytes (1.0 GB) copied, 46.391 seconds, 22.1 MB/s

 

 linux4版本用time來計時

[xxx]$ time dd if=/dev/zero bs=1k count=1000000 of=1Gb.file

1000000+0 records in

1000000+0 records out

 

real    0m2.035s

user    0m0.114s

sys     0m1.921s

 

寫速度：1000M/2.035=491M

 

[xxx]$ time dd if=1Gb.file bs=64k |dd of=/dev/null          

15625+0 records in

15625+0 records out

2000000+0 records in

2000000+0 records out

 

real    0m2.420s

user    0m0.368s

sys     0m1.889s

讀速度：1000M/2.420=413M