Iostat

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iostat allows you to view which block devices are under heavy I/O load. iostat's output looks like this:

tweedleburg:~ # iostat
Linux 2.6.25.18-0.2-default (tweedleburg)       12/12/08

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           2.52    0.00    0.54    0.89    0.00   96.05

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda               8.75        76.23       322.62   40950470  173309808
sda1              8.68        76.23       322.62   40950126  173309808
sdb               0.00         0.01         0.00       4184        720
sdb1              0.00         0.00         0.00        779          0
sdb2              0.00         0.01         0.00       3029        720
sdc               0.00         0.00         0.00       2638         48
sdc1              0.00         0.00         0.00       1142         48
sde               5.94        48.31       708.14   25952348  380412440
sde1              5.94        48.31       708.14   25951388  380412440

See also