OSI/MHS Configuration and Management Manual

Sizing and Tuning Your OSI/MHS Subsystem
OSI/MHS Configuration and Management Manual—424827-003
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Defining APPL Objects
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Give the following attributes values appropriate to the throughput characteristics of
the adjacent MTA and the connection to that MTA:
ASSOC-OPEN-TIME
LINK-RETRY-TIME
ROUTE-RETRY-TIME
REM-MSG-THRUPUT
REM-MSG-OVERHEAD
MAX-MSG-TRANSFER-TIME
Note that route-retry times can vary for normal, urgent, and nonurgent messages and
for reports. See the description of association establishment in Section 9,
Troubleshooting Your OSI/MHS Subsystem, and the description of MTA throughput
and overhead in Throughput Characteristics of Adjacent MTAs on page 8-3.
Defining APPL Objects
HP recommends the use of generic APPLs rather than specific APPLs for maintenance
reasons, as described in Section 2, Management Environment for OSI/MHS. The use
of generic APPLs, equivalent to hierarchical routing, can also improve the performance
of OSI/MHS by passing final routing responsibility to the application. Whether
performance improves from the end-user’s perspective depends on how efficiently the
application completes the routing.
Defining Distribution Lists and CUGs
Name resolution for local distribution lists and checking for closed user group
membership can both result in large numbers of database accesses and therefore slow
routing. The rationale for distribution lists is convenience: users and applications save
time by specifying one name rather than multiple names; also, a user need not know
the names of the members of the list to use it. In a large proportion of applications,
these factors outweigh the routing overhead. Similarly, closed user groups are used
primarily in cases where security or policy requirements outweigh the routing
overhead.
Routing is most efficient when a distribution list or CUG is defined where most of its
members reside. It is especially inefficient if a distribution list defined on one MTA
contains a nested distribution list defined at another MTA, and the nested distribution
list includes members residing at the first.
Note. Although CUG processing invariably causes a delay at the location where the CUG is
defined, the use of CUGs can in fact improve the throughput of a message handling network if
they serve to reduce bulk mailings. (The additional routing effort for CUG checking at one
location potentially prevents the message form being relayed and delivered unnecessarily to
other locations.)