top shows high cpu iowait

Hi,
  My server shows very high (98%) cpu iowait all the time via top;
iostat -xtc 5 does not show high disk activities; netstat -i 5 does not show high
network traffic.

Q1.  what exaclty does 98% iowait mean?

Q2. how can I find out exaclty what the cpus are waiting for;
mpstat show both cpus wait 98% all the time.


thanks in advance
siunixAsked:
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OtetelisanuConnect With a Mentor Commented:
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OtetelisanuCommented:
Resource                         Description
cpu_idle       Percent of time that the CPU is idle.
cpu_iowait     Percent of time that the CPU spends waiting for I/O.
cpu_kernel     Percent of time that the CPU spends in the kernel.
cpu_type       CPU architecture.
cpu_user       Percent of time that the CPU spends running users program.
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OtetelisanuCommented:
mpinfo -N -v
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siunixAuthor Commented:
there's no mpinfo on solaris 2.8.
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