You appear only to have one physical disk (c7t0d0) with a number of slices.

You should be able to monitor the per-user I/O with a tool like top or sar (or 
Performance Monitor if you are on Windows).
Relate the pids from that report back to the pids of your UniVerse processes.

Definitely investigate making more than one disk spindle available, to spread 
the I/O load.

Contact your support provider (IBM Malaysia?) about performance monitoring and 
database tuning services.
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