# fdisk -l /dev/sda

Disk /dev/sda: 255 heads, 63 sectors, 89173 cylinders

Units = cylinders of 16065 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System

/dev/sda1   *         1       765   6144831   83  Linux/dev/sda2           766      1020   2048287+  82  Linux swap/dev/sda3          1021      2423  11269597+  83  Linux/dev/sda4          2424     89173 696819375   83  Linux

# hdparm -t /dev/sda1

/dev/sda1:

 Timing buffered disk reads:  64 MB in  0.64 seconds =100.00 MB/sec# hdparm -t /dev/sda2

/dev/sda2:

 Timing buffered disk reads:  64 MB in  0.83 seconds = 77.11 MB/sec# hdparm -t /dev/sda3

/dev/sda3:

 Timing buffered disk reads:  64 MB in  3.05 seconds = 20.98 MB/sec# hdparm -t /dev/sda4

/dev/sda4:

 Timing buffered disk reads:  64 MB in  0.49 seconds =130.61 MB/sec

##

# hdparm -t /dev/sda1

/dev/sda1:

 Timing buffered disk reads:  64 MB in  1.84 seconds = 34.78 MB/sec

# hdparm -t /dev/sda4

/dev/sda4:

 Timing buffered disk reads:  64 MB in  1.28 seconds = 50.00 MB/sec在一个几乎是idle的系统中测试的数据如上,outer sector与inner sector看来区别并不在/data分区 130.61MB/sec, 50.00MB/sec都有/分区则 100.00MB/sec, 34.78MB/sec都有上述只是简单测试，要看到sector区域对sequential IO性能的影响，还必须取大量数据划出曲线才行.

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/94384/viewspace-600288/，如需转载，请注明出处，否则将追究法律责任。