TS/MP 2.5 System Management Manual

TCPS
For TCPs, use this formula:
x no. of TCPsMAXSERVERSconstant xno. of links required =
no. of TCPs
where the constant is a safety factor, MAXSERVERS is the result of Step 6, and no. of TCPs
is the total number of TCPs from Step 2. The result, no. of links required by TCPs, is the
total potential TCP demand for links to the server class.
This example uses the value 1 as the constant:
= 2MAXSERVERS=1201 x
60 TCPs
2 x 60 TCPs = 120 links required by the TCPs
If your application environment is designed for a homogeneous distribution of transactions across
Pathsend requestors or TCPs, you could set the value of constant at 1. However, to account for
possible processor failure, consider using this formula:
11 +
no. of CPUs - 1
If your application is designed for uneven distribution of transactions across Pathsend requestors
or TCPs, increase the value of constant to support a potential increase in requests to a given
link manager.
The result of multiplying the constant by (MAXSERVERS/no. of CPUs or TCPs) is rounded up
to the next whole integer to avoid the possibility of link manager (LINKMON/ACS subsystem)
processes or TCPs attempting to share fractions of links.
Step 8 Calculate the MAXLINKS Attribute
This step produces values for the key server class attribute MAXLINKS. Together, MAXLINKS and
MAXSERVERS (from Step 4) provide for optimum link configuration and help maximize server class
performance. In this formula, you insert values for two variables—no. of links required
and MAXSERVERS—based on the results of previous steps, and then resolve the equation to arrive
at a value for the third variable, MAXLINKS. Following is the formula:
from formula in Step 7no. of links required ----------------->MAXLINKS
=
from formula in Step 6MAXSERVERS ----------------->
where no. of links required is the number of links required by the ACS subsystem processes or
TCPs (from Step 7) and MAXSERVERS is the requirement for total active links (from Step 6).
Resolve the equation to get MAXLINKS.
In this example, the value for no. of links required is 120, from the TCP example in Step
7. MAXSERVERS is also 120, the required number of active links.
-----------------> from TCP example in Step 7120 TCP
links
required
2
=
-----------------> from example in Step 6MAXSERVERS=120
Configuring Links for Optimum Performance 73