I found another way to start a strange disk activity. Try to du on a
large tree in an endless loop. At the beginning there a lot of read
activity to fill the readcache but the read activity is decreasing until
everything is in the cache. The strange thing IMHO is that there is a
continious write activity starting from flushing old buffers. There was
nothing more running than this endless du-loop and update flushing the
buffers.
Where are these writes coming from ?
Uwe