LINUX下磁盘IO机能测试评估与优化
时间:2013-05-23 09:25来历: 作者:admin 点击: 次
LINUX下磁盘IO机能测试评估: 一:dd 这不是一个专业的测试东西,不外假如对付测试功效的要求不是很苛刻的话,平时可以利用来 对磁盘的读写速度作一个简朴的评估. 观念描写: /dev/null:绰号
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LINUX下磁盘IO机能测试评估:
一:dd
这不是一个专业的测试东西,不外假如对付测试功效的要求不是很苛刻的话,平时可以利用来
对磁盘的读写速度作一个简朴的评估.
观念描写:
/dev/null:绰号叫无底洞,你可以向它输出任何数据,它通吃,而且不会撑着!
/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)任何写入它的输出城市被丢弃,假如不
想让动静以尺度输出显示或写入文件,那么可以将动静重定向到位桶.
/dev/zero------该设备无穷尽地提供0,可以利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.
测试情况:
1.测试磁盘的IO写速度
测试处事器:Dell R710 4块300G的sas硬盘做的raid5
=======================================
酒仙桥234处事器
[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
======================================
测试处事器: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:从以上数据比拟可以看出,写同样2.5GB的文件 旧处事器硬盘的写是新采购处事器的写速度
的10倍以上。
2.测试磁盘的IO读速度
测试处事器:Dell R710 4块300G的sas硬盘做的raid5(为TT处事器 正在提供读处事的同时
举办测试)
====================================
[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
====================================
测试处事器: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
===================================
同批次一样处事器做读测试:
为屏蔽其它因素影响 我找了同批次的其它处事器做测试 系统情况 硬盘等全部
沟通
====================================
[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
==================================
同批次处事器做写测试:
===================================
[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 假如解除其他影响,新批次处事器和旧批次处事器读写测试数据如下:
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