performance problem with ontape -c

Hi there, I have an intermittent performance problem associated with ontape -c. It grabs CPU resource as evidenced by the unix ps commandwhere ontape -c averages 70% to 90% of CPU utilisation. There's 34 logical log files and on average only 2 go to tape per day. vmstat shows 0% idle CPU resource perpetually when it's usually about 50% idle. Any ideas would be greatly appreciated. Digital unix 4.0D Decalpha 4100 Informix Online 7.24 FC-6 ps -elf snapshot 0.4| [kernel idle] 0.2| asehsm -h 3.3| /omniguard/ita/bin/osf1-axp/itaagtd 5.1| /brock/prd0/informix/release/v7.24.FC6-1/bin/onini 0.1| /brock/prd0/informix/release/v7.24.FC6-1/bin/onini 0.7| /brock/prd0/informix/release/v7.24.FC6-1/bin/onini 82.2| ontape -c 0.2| -ksh (ksh) total 92.2 Thanks Zanne Fagerstrom IBM Global Services Australia