MPE/iX 5.5 Operating System Limits

Nodal manager
Nodal Manager is a Module in DTS Subsystem. This provides routing information for
connection establishment and implements the the DCProbe Protocol. It provides non-
nailed device capability for TIO and PAD. NDM also provides the routing information
for DTCM packets and inbound TIO packets. It maintains lists to perform these tasks.
The Nodal Manager(abbr. NDM) is a LLIO manager and it therefore has a Port Data
Area(abbr. PDA) of a fixed size. The NDM also has an auxiliary data area(abbr. ADA)
with a size which is dependent on the number of configured devices and AVESTA boxes.
Neither the PDA nor the ADA is frozen in memory.
The following is a measure of the size of NDM Routing Tbl object:
MAX_DEVS = 4649 + 520 (MAX DEVS + MAX BOX ENTRIES(DTCM)
Maximum number of entries in routing table = 5170
Maximum number of entries in dtcm_port_tbl (kso) = 512
Limits configurable from dcc/NMMGR with regards to
dts:
Max. No.of DTCs : 400 (NMCONFIG file limit)
The above value is being changed to support DTS in 5.5 from 120.
Max. No of Ldevs : 4649
This accounts to the number of devices configured through NMMGR.
Max No. of Classes : 2000 (Validation Performance limit)
The utility program NMMGR.PUB.SYS will not allow a user to configure more than
4649 terminals (connected via DTCs). This value was chosen to be 30 less than the
maximum number of devices. Being able to configure 4649 terminals does not mean that
MPE will support 4649 sessions.
Serial printers are also configured as terminals using NMMGR. The total number of
serial printers and terminals cannot exceed 4649. The maximum number of serial printers
that is supported varies, depending on the type and the system.