PMDF System Manager's Guide

Critical SYSGEN parameters for overall Dispatcher functioning

The SYSGEN parameter MAXPROCESSCNT must be large enough to accomodate the number of server processes, in addition to any other processes on the system.

Sites running DEC TCP/IP Services (UCX) should set the SYSGEN parameter
CHANNELCNT=Sum_services MAX_CONNS + Sum_services (MAX_CONNS*MAX_PROCS)+30.

Sites running MultiNet or TCPware can avoid the need to change their system's CHANNELCNT by instead setting UCX_HOLD=0 in the Dispatcher configuration file.

SYSGEN parameters relevant for mailbox servers

SYSGEN system minimums and system defaults for quotas can affect the quotas for server processes. SYSGEN parameters especially relevant for PMDF mailbox servers are:
PQL_MASTLM, PQL_DASTLM,
PQL_MBIOLM, PQL_DBIOLM,
PQL_MBYTLM, PQL_DBYTLM,
PQL_MCPULM, PQL_DCPULM,
PQL_MDIOLM, PQL_DDIOLM,
PQL_MENQLM, PQL_DENQLM,
PQL_MFILLM, PQL_DFILLM,
PQL_MJTQUOTA, PQL_DJTQUOTA,
PQL_MPGFLQUOTA, PQL_DPGFLQUOTA,
PQL_MTQELM, PQL_DTQELM,
PQL_MWSDEFAULT, PQL_DWSDEFAULT,
PQL_MWSQUOTA, PQL_DWSQUOTA,
PQL_MWSEXTENT, PQL_DWSEXTENT (limited by WSMAX),
VIRTUALPAGECNT, and CHANNELCNT. Rather than using the SYSGEN values, however, the POP and IMAP servers will preferentially use an explicit quota settings from their Dispatcher configuration file service sections. These SYSGEN values are only used if a Dispatcher quota option has not been set.

The quotas for server processes can be controlled via quota options in the Dispatcher configuration file. The top of the Dispatcher configuration file can define global default quotas, and quota values specific for specific services can be set in that service's definition section in the Dispatcher configuration file.