MPE/iX 5.5 Operating System Limits

- The system has 1000 sessions logged on via DTCs.
- The system has 700 sessions logged remotely via virtual terminals.
- The system has 50 jobs logged on.
- All jobs and sessions are active.
- 500 global system DSTs.
For the model above the number of DSTs used by the system would be equal to the
following formula:
# Of System DSTs = 500 + (1000 * 6) + (700 * 8) + (50 * 5)
= 12350
Remember that your mileage may vary depending on: the number of processes per logon,
the number of CM files open, and the number of extra data segments an application uses.
Devices:
Item Limit Description Resource Table
1 ~4000 Device Classes DCT DST
2 255 Disc Drives Max Tested Configuration
3 4679 Logical Devices 3 Digit LDev Numbers
2 127 Mirrored Disc Pairs Max Tested Configuration
4 4649 Terminals Connected via DTCs. NMMGR Config Limit
(1) Dct DST - DST040
The Device Class Table (DCT) is used to map device classes to their respective logical
devices. For devices configured in SYSGEN, there is a limit of 256 ldevs for each unique
device class. In addition, SYSGEN limits the number of different device classes that can
be assigned to a specific ldev to 8.
(2) Max tested configuration
The maximum number of disc drives (255) and the maximum number of mirrored disc
pairs (127) which are supported is based on the maximum tested configurations. Software
or hardware limits may be reached if these values are exceeded.