Guardian Application Conversion Guide DCT Limits Extension Addendum

Affected Procedures
Guardian Application Conversion Guide DCT Limit Extension Addendum—527418-001
1-3
Deciding Whether to Extend the DCT Limit
Deciding Whether to Extend the DCT Limit
Do not extend the DCT limit if the system is:
•
Running applications that cannot handle unsigned 16-bit ldevs
•
Networked to a remote system that is running applications that access the local
system and that cannot handle unsigned 16-bit ldevs
•
Networked to a system that is running a release of the NonStop Kernel that does
not support unsigned 16-bit ldevs
Before extending the DCT limit, consider:
•
The pattern of process creations and deletions on the system
A system on which the number of named processes varies significantly needs
more leeway with respect to the DCT limit than a system that creates and
maintains a roughly constant number of processes.
•
The likelihood that devices will be dynamically added to the system
If a large number of devices could be added, ensure that DCT usage is not close to
the limit.
•
The number of processors in the system
The greater the number of processors in the system, the easier it is to exceed the
default DCT limit.
Example 1-2. PEEK Output for System Running With MEDIUM DCT Range
Enabled
PEEK - T9050G09 - (07NOV03) - (15SEP03) - (APF) SYSTEM \TROLL
COPYRIGHT TANDEM COMPUTERS INCORPORATED 1981, 1985, 1988, 1990
SYSTEM \TROLL
22 MAR 2004, 16:42___ELAPSD 5:46:45___CPU 4(NSR-T)
MAXIMUM USED CURRENT USAGE # CONFIGURED # OF FAILURES
TLE 33 29 3600 0
PCB 13: 2366 11: 2366 255: 3744 0: 0
NRL S 2215 2215 32767 0
M 548 543 32608 0
PPL S 2214 2214 32767 0
M 548 543 32608 0
PTLE 0 0 0 0