root@xxx:~# iostat -d 2 2
Linux my.kernel.version (my.hostname) 	12/07/10 	_x86_64_

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda              31.14       411.84       757.85 1890371422 3478544478
sda1             31.01       409.90       755.62 1881435002 3468289496
sdb               9.97        88.27       303.57  405165646 1393372152
sdb1              9.97        88.27       303.57  405164878 1393372152
sdc               7.54        57.13       131.10  262215600  601759006
sdc1              7.54        57.13       131.10  262214832  601759006

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda             269.00         4.00      5968.00          8      11936
sda1            269.00         4.00      5968.00          8      11936
sdb              15.00         8.00       416.00         16        832
sdb1             15.00         8.00       416.00         16        832
sdc              71.00        12.00       752.00         24       1504
sdc1             71.00        12.00       752.00         24       1504