The binary "iostat" comes from the package "sysstat" and is available on all Linux/Unix like platforms. 

Use the "-m" option to give you what you probably want, which is to see in MB/s how much bandwidth each disk is doing.

iostat -m
Linux 2.6.24.2 ((none))         04/16/10

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.08    0.00    3.45   18.64    0.00   77.83

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sda             430.19        26.80         0.00     149821          5
sdb              78.96         0.00        29.53          8     165085
sdc               0.08         0.00         0.00          2         27

mb, disk, io, usage, bandwidth, iostat, sysstat, packagethe, binary, quot, linux, unix, platforms, avg, cpu, user, iowait, idle, tps, mb_read, mb_wrtn, sda, sdb, sdc,

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