There are several factors in determining disk-based queuing:
1) The queue size: If the queue depth is less than a certain number, the disk queue is not engaged. The number is set by the environment variable DISKQ_MINMSGS (default 50)
Two and Three only apply if the queue depth is larger than the minimum.
2) Virtual memory percent used: If more than 75% of virtual memory is used then the message is stored to disk.
Three only applies if virtual memory utilization <= 75% 3) If the process threshold is set and the total size of all messages in memory is greater than the threshold then the message is stored to disk. Default is never to store on disk. Conclusions: The best way to be sure that nothing goes to disk is to set DISKQ_MINMSGS very high. Then nothing else matters. If the customer
Rob Abbott
Cloverleaf Emeritus
