LINUX下磁盘IO性能测试评估

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一:dd

这不是一个专业的测试工具,不过如果对于测试结果的要求不是很苛刻的话,平时可以使用来

对磁盘的读写速度作一个简单的评估.

概念描述:

/dev/null:外号叫无底洞,你可以向它输出任何数据,它通吃,并且不会撑着!

/dev/zero:是一个输入设备,你可你用它来初始化文件.

/dev/null------它是空设备,也称为位桶(bit bucket)任何写入它的输出都会被抛弃,如果不

想让消息以标准输出显示或写入文件,那么可以将消息重定向到位桶.

/dev/zero------该设备无穷尽地提供0,可以使用任何你需要的数目——设备提供的要多的多,

他可以用于向设备或文件写入字符串0.

测试环境:

1.测试磁盘的IO写速度

测试服务器:Dell R710 4块300G的sas硬盘做的raid5

=======================================

酒仙桥234服务器

[root@club_c2 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 4.11606 seconds, 597 MB/s

real0m17.010s

user0m0.059s

sys0m5.323s

[root@club_c2 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 4.17078 seconds, 589 MB/s

real0m19.993s

user0m0.062s

sys0m5.396s

[root@club_c2 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 4.13825 seconds, 594 MB/s

real0m4.970s

user0m0.053s

sys0m4.662s

[root@club_c2 ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 4.14597 seconds, 593 MB/s

real0m15.880s

user0m0.054s

sys0m5.296s

======================================

测试服务器:Dell R720 3块1T的sas硬盘做的raid 5

======================================

[root@BJ-XYWY-TT-S ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 41.9644 s, 58.6 MB/s

real0m42.761s

user0m0.049s

sys0m4.832s

[root@BJ-XYWY-TT-S ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 57.8129 s, 42.5 MB/s

real0m58.574s

user0m0.064s

sys0m5.321s

[root@BJ-XYWY-TT-S ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 73.3101 s, 33.5 MB/s

real1m14.115s

user0m0.057s

sys0m5.268s

[root@BJ-XYWY-TT-S ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 57.1162 s, 43.0 MB/s

real0m57.956s

user0m0.053s

sys0m5.266s

===================================

结论:从以上数据对比可以看出,写同样2.5GB的文件旧服务器硬盘的写是新采购服务器的写速度

的10倍以上。

2.测试磁盘的IO读速度

测试服务器:Dell R710 4块300G的sas硬盘做的raid5(为TT服务器正在提供读服务的同时

进行测试)

====================================

[root@club_c2 ~]# df -m

Filesystem 1M-blocks Used Available Use% Mounted on

/dev/sda2 79353 56963 18294 76% /

/dev/sda5 469736 356678 88812 81% /data

/dev/sda1 190 12 169 7% /boot

tmpfs 16089 0 16089 0% /dev/shm

[root@club_c2 ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485424+1 records in

10485424+1 records out

85896599040 bytes (86 GB) copied, 622.215 seconds, 138 MB/s

real10m22.222s

user0m2.020s

sys1m29.195s

[root@club_c2 ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485424+1 records in

10485424+1 records out

85896599040 bytes (86 GB) copied, 668.701 seconds, 128 MB/s

real11m9.036s

user0m2.009s

sys1m30.678s

====================================

测试服务器:Dell R720 3块1T的sas硬盘做的raid 5

=====================================

[root@BJ-XYWY-TT-S ~]# df -m

Filesystem 1M-blocks Used Available Use% Mounted on

/dev/sda2 80635 4540 72000 6% /

tmpfs 16015 0 16015 0% /dev/shm

/dev/sda1 194 31 153 17% /boot

/dev/sda5 1791905 193494 1507388 12% /data

[root@BJ-XYWY-TT-S ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485760+0 records in

10485760+0 records out

85899345920 bytes (86 GB) copied, 288.598 s, 298 MB/s

real4m48.600s

user0m1.906s

sys1m40.585s

[root@BJ-XYWY-TT-S ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485760+0 records in

10485760+0 records out

85899345920 bytes (86 GB) copied, 289.268 s, 297 MB/s

real4m49.285s

user0m2.016s

sys1m46.656s

[root@BJ-XYWY-TT-S ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485760+0 records in

10485760+0 records out

85899345920 bytes (86 GB) copied, 289.126 s, 297 MB/s

real4m49.142s

user0m1.915s

sys1m44.174s

===================================

同批次一样服务器做读测试:

为屏蔽其它因素影响我找了同批次的其它服务器做测试系统环境硬盘等全部

相同

====================================

[root@develop-dd ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485424+1 records in

10485424+1 records out

85896599040 bytes (86 GB) copied, 279.047 seconds, 308 MB/s

real4m39.076s

user0m2.005s

sys1m23.022s

[root@develop-dd ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485424+1 records in

10485424+1 records out

85896599040 bytes (86 GB) copied, 273.026 seconds, 315 MB/s

real4m33.037s

user0m1.952s

sys1m23.991s

[root@develop-dd ~]# time dd if=/dev/sda2 of=/dev/null bs=8k

10485424+1 records in

10485424+1 records out

85896599040 bytes (86 GB) copied, 281.58 seconds, 305 MB/s

real4m41.603s

user0m1.922s

sys1m25.505s

==================================

同批次服务器做写测试:

===================================

[root@develop-dd ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 3.805 seconds, 646 MB/s

real0m4.659s

user0m0.053s

sys0m4.605s

[root@develop-dd ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 3.97341 seconds, 619 MB/s

real0m7.877s

user0m0.072s

sys0m5.093s

[root@develop-dd ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 4.81706 seconds, 510 MB/s

real0m15.508s

user0m0.055s

sys0m5.213s

[root@develop-dd ~]# time dd if=/dev/zero of=/test.dbf bs=8k count=300000

300000+0 records in

300000+0 records out

2457600000 bytes (2.5 GB) copied, 4.05051 seconds, 607 MB/s

real0m9.150s

user0m0.054s

sys0m5.215s

==============================

综上所述如果排除其他影响，新批次服务器和旧批次服务器读写测试数据如下:

-----------------------------------------------------------

平均读速度平均写速度

-----------------------------------------------------------

dell R720 297M/S 44.3M/S

----------------------------------------------------------

dell R610 309M/S 625M/S

---------------------------------------------------------

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