Interpreting vmstat / sar / iostat on solaris

We are having performance issues on one server that has 3 DB's . The TPS is less than 1.0 on each DB based on values from AWR reports ( 10204). I'm pasting the output from vmstat, sar and iostat. The CPU seems to be 80% idle. Is the problem related to disk I/O ? Please advise.

[10.2.0.4-PUBTS] /export/home/oracle/dba $ sar -u 2 20

SunOS bupscubdb2 5.10 Generic_127128-11 i86pc    01/05/2012

15:03:10    %usr    %sys    %wio   %idle
15:03:12      10      10       0      80
15:03:14      11       9       0      80
15:03:16      12      12       0      76
15:03:18      10      10       0      80
15:03:20      11       9       0      79
15:03:22      11       9       0      79
15:03:24       8       8       0      84
15:03:26      11      10       0      79
15:03:28      11       9       0      80
15:03:30      10      10       0      80
15:03:32      11      10       0      79
15:03:34      10       8       0      82
15:03:36      10       9       0      81
15:03:38      11      10       0      79
15:03:40      10       9       0      81
15:03:42      10       9       0      80
15:03:44       9      10       0      81
15:03:46      10      10       0      80
15:03:48      10       9       0      81
15:03:50      10      10       0      80

Average       10      10       0      80
[bupscubdb2]: oracle ()...

[10.2.0.4-PUBTS] /export/home/oracle/dba $ vmstat 2 20
 kthr      memory            page            disk          faults      cpu
 r b w   swap  free  re  mf pi po fr de sr f0 s0 s1 s2   in   sy   cs us sy id