Shulou(Shulou.com)06/02 Report--

1. Test the write-only performance of the disk dd if=/dev/zero of=/file

[oracle@11g ~] $touch ddTest

[oracle@11g ~] $time dd if=/dev/zero of=/home/oracle/ddTest bs=1k count=1024

1024000 records in

1024000 records out

1048576 bytes (1.0 MB) copied, 0.0261858 s, 40.0 MB/s

Real 0m0.029s

User 0m0.009s

Sys 0m0.017s

[oracle@11g ~] $du-h ddTest

1.0M ddTest

2. Test the pure read performance of the disk dd if=/file of=/dev/null

[oracle@11g ~] $time dd if=/dev/ Zero ^ CF = / home/oracle/ddTest bs=1k count=1024

[oracle@11g ~] $touch test1

[oracle@11g ~] $time dd if=/home/oracle/test1 of=/dev/null bs=1k count=1024

0500 records in

0500 records out

0 bytes (0 B) copied, 0.000124694 s, 0.0 kB/s

Real 0m0.001s

User 0m0.000s

Sys 0m0.000s

[oracle@11g] $du-h / home/oracle/test1

0 / home/oracle/test1

3. Test the read and write performance of the disk dd if=/file1 of=/file2

[oracle@11g ~] $time dd if=/home/oracle/test1 of=/home/oracle/test bs=1k count=1024

0500 records in

0500 records out

0 bytes (0 B) copied, 0.000124904 s, 0.0 kB/s

Real 0m0.002s

User 0m0.001s

Sys 0m0.000s

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