Hi,
I think some more detail about your set-up will help to get some answers:
Oracle version
Operating system
Number of CPUs
and
The database I/O configuration (disk_asynch_io and filesystemio_options)
and the set-up of the storage being used.
I think that this points to the I/O subsystem not being able to keep up
with the load it is being given.
Regards
Pete
