Chapter 3. Operating NetView FTP V2.2.1 MVS - IBM

The OBTINTVL Server Initialization Parameter Value
Request Unit
The value specified for this parameter determines the interval after a server unsuccessfully
tries to obtain a request from the queue handler, or an OSI server unsuccessfully
tries to get a result from OSI/File Services, before the server tries to get a
new file transfer request from the queue handler or a result from OSI/File Services.
When selecting a value for this parameter, the system administrator must take the
following into consideration:
� The lower the OBTINTVL value, the less the wait time between trying to obtain
a request from the queue handler.
� Every time a server tries to obtain a request from the queue handler an FSB
slot is used; a low OBTINTVL value can cause bottlenecks, if the FSBSLOTS
value is low and other NetView FTP V2.2.1 MVS components are waiting for
FSB slots.
Request-Unit Size
The value for the RU size is taken from the VTAM logon mode table specified in
server initialization parameters. The value specified for this parameter determines
the size of the RUs transferred. NetView FTP V2.2.1 MVS supports any RU size
that is supported by the installed version of VTAM; this has the following effects on
performance:
� Controls the number of ACF/VTAM cycles when sending and receiving the
RUs.
� Gives a better network tuning capability for the user. You can define the best
RU size for the network, depending on the applications, control units, and other
resources.
For customization and tuning an RU size of 2KB is recommended.
Negative impacts of large RU sizes are:
� More system storage for each session is needed.
� They could decrease the overall performance of the system.
� Severe ACF/VTAM buffer problems could occur.
212 NetView FTP V2 MVS Installation, Operation, and Administration