Dell 1950 + raid 1的IO参数

1 write
[root@crdb11gtest home]# time dd if=/dev/zero of=/home/dell1950_w bs=4k count=1000000
1000000+0 records in
1000000+0 records out
4096000000 bytes (4.1 GB) copied, 23.1889 seconds, 177 MB/s

real 0m23.199s
user 0m0.429s
sys 0m9.212s
[root@crdb11gtest home]#


2 read and write
[root@crdb11gtest home]# time dd if=/home/dell1950_w of=/home/dell1950_rw bs=4k count=1000000
1000000+0 records in
1000000+0 records out
4096000000 bytes (4.1 GB) copied, 32.6168 seconds, 126 MB/s

real 0m32.619s
user 0m0.520s
sys 0m11.372s

3 read
[root@crdb11gtest home]# time dd if=/home/dell1950_w of=/dev/null bs=4k count=1000000
1000000+0 records in
1000000+0 records out
4096000000 bytes (4.1 GB) copied, 2.47123 seconds, 1.7 GB/s

real 0m2.473s
user 0m0.373s
sys 0m2.041s