Problem: The customer complains that performance is slow and that disk access is excessive. Solution: Run the 3 following commands : sar -u 2 10 verify that the WIO value is greater that 30. If it is not, the customer is not suffering from excessive disk access (generally < 30% is acceptable). vmstat -s verify that the system is not swapping by checking the pages on swap category. If this number is a high value, swapping is probably occuring. If swapping is occuring, it is advisable to add more RAM to your computer. sar -b 2 10 check %rcache %wcache If the %rcache is less than 90% or the %wcache is less than 60% the preformance can probably be improved significantly by tuning the SCO Unix kernel parameter NBUF to a larger value. See the SCO help documentation for more information on Performance Tuning.
Last Modified: 23-OCT-00