hard disk reliability

[Christoph Wasshuber]

Some days ago someone mentioned that one of
the big benefits of running a diskless cluster
is the increased reliability. Hard disks are
the most unreliable part in PCs. Does anybody
have manufacturer numbers like MTBF (mean time
between failure)?

I would also be interested in comments from
people running beowulfs with 100 or more
nodes, where every node has a hard disk. Do
you guys exchange a hard disk every month?
Or even every week?

How serious is the hard disk reliability issue
in reality?

Chris....