7.22.UC1X2 Performance tuning questions....

Team, We have recently upgraded our HP-UX 9.04 / 5.07 to HP-UX 10.20 / 7.22.UC1X2. Here is some information about the system configuration...... Database size 50 GB, chunks 43, memory 3 GB, disk nike arrays 120GB, cpus 8 NUMCPUS 7 LOCKS 600000 BUFFERS 300000 CKPTINTVL 600 NUMAIOVPS 20 PHYSBUFF 400 LOGBUFF 400 LOGSMAX 165 CLEANERS 45 SHMVIRTSIZE 1000000 SHMADD 200000 LRU_MAX_DIRTY 5 LRU_MIN_DIRTY 1 LRUS 45 STACKSIZE 32 OPTCOMPIND 2 NOAGE 0 We don't have KAIO set because processor affinity is not supported on HP. Problems we are having.... 1) A checkpoint is taking 16-20 seconds (Stats based on interval of 300). 2) Ready to run can be over 60 processes. 3) The oninit processes never go below 156 for a priority and can be as high as 268. 4) System not using indexes correctly - Have run update statistics medium for all tables, update statistics high on first column of each index and run update statistics low on all other index fields. Can any one advise me on their update statistics strategie ? (This system is 24x7) 5) Our LRU writes are 60% and the chunk writes are 40 % of the onstat -F command. 6) If we changed our optcompind to zero would we need to run so many update stats? I look forward to any suggestions you can provide... Cheers, Tony.