IBM i series Handbook page 79

• Mail and Calendaring Users (MCU) : This relative performance measurement is
derived by performing mail and calendaring functions. This workload is considerably
more complex than Simple Mail Users. The MCU workload represents users on a
Notes client who are reading, updating, or deleting documents in an e-mail database,
as well as lookups in the Domino directory and scheduling appointments and
invitations. Reported values reflect 70% processor utilization.
• Commercial Processing Workloads (CPW) : CPWs are representative of commercial
applications, particularly those that do significant database processing in conjunction
with journaling and commitment control. The reported values for CPW represent the
capacity of a non-Domino workload available to support a Domino environment. The
reported CPW may be used by System Resource activities and Domino resource
extensions such as database accesses and external program calls. The amount of
CPW consumed reduces the available capacity to perform Domino workloads reflected
as SMU or MCU.
– Processor CPW is an approximate value reflecting the maximum amount of
non-Domino workload (10 to 15% of CPU) that can be supported.
– Interactive CPW is an approximate value reflecting the portion of Processor CPW that
can be used for application workloads performing interactive-based tasks.
Dedicated Domino Processors
100%
CPU
0%
10 to
15%
The above figure shows the relationships of the various workloads on the Dedicated Domino
Processors. Domino can take any available CPU capacity (even below the line). The CPW
workload can never rise above the line, and excessive attempts to use CPW resources do not
significantly affect Domino performance. If CPW exceeds its limit, the system will not redirect
Domino resources to non-Domino (CPW) work, and the non-Domino performance
degradation can be dramatic.
For some Domino solution scenarios, you need to work closely with an IBM, Lotus, or IBM
Business Partner representative to determine whether iSeries Model 270 with standard
processor features, 8xx servers, or the new Dedicated Server for Domino is most appropriate
for the proposed environment. In particular, Domino applications that require some degree of
Workload and Performance
Domino resources
Processor CPW
Interactive CPW
Workload and Performance
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