PMDF System Manager's Guide

PMDF by default stores all messages queued to a channel as files in the directory PMDF_QUEUE:[channel-name] (OpenVMS), or /pmdf/queue/channel-name/ (UNIX). However, a channel which handles a large number of messages and tends to build up a large store of message files waiting for processing, e.g., a TCP/IP channel, may get better performance out of the file system if those message files are spread across a number of subdirectories. The subdirs channel keyword provides this capability: it should be followed by an integer which specifies the number of subdirectories across which to spread messages for the channel, e.g.,

tcp_local single_sys smtp subdirs 10

The maximum value is 999.