PMDF System Manager's Guide

The urgentblocklimit, normalblocklimit, and nonurgentblocklimit keywords may be used to instruct PMDF to downgrade the priority of messages based on size. The keywords must be followed by a single integer value, specifying the message size, in PMDF blocks, at which to perform the priority downgrading. A PMDF block is normally 1024 bytes; this can be changed with the BLOCK_SIZE option in the PMDF option file; see Section 7.3.5. This priority, in turn, may affect whether the message is processed immediately, or whether it is left to wait for processing until the next periodic job runs; see Section 2.3.4.9.

The urgentblocklimit keyword instructs PMDF to downgrade messages larger than the specified size to normal priority. The normalblocklimit keyword instructs PMDF to downgrade messages larger than the specified size to nonurgent priority. The nonurgentblocklimit keyword instructs PMDF to downgrade messages larger than the specified size to lower than nonurgent priority (second class priority), meaning that the messages will always wait for the next periodic job for further processing.