Mathieu Roy writes:
 > 
 > Journals are actually not useful in this case. 

        By default ext3 write the journal every 5 sec and I reckon
this was the reason why writing lots of temporary data in /tmp was
generating a high I/O traffic.

 > But can't it be also
 > related to the nature of the hardware? One more time I'll talk about
 > SCSI ;), IDE is known to use lot of CPU when you access a lot to a
 > disk...

        I think SCSI would only better cope with the high I/O traffic.
However, lots of I/O in this case is not normal nor necessary. 

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