iostat 显示的Blk_read/s的块大小与平时ext3文件系统的块大小不同

ext3文件系统的块大小是1K

以前一直以为iostat显示的块大小为1K，实际上是错误的。

iostat显示的Blk_read/s的意义是：
Blk_read/s
Indicate the amount of data read from the drive expressed
in a number of blocks per second. Blocks are equivalent
to sectors with 2.4 kernels and newer and therefore have
a size of 512 bytes. With older kernels, a block is of
indeterminate size.

具体看man iostat