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