Capacity Planning of SOA-Based Systems - Service Technology ...

SOA in the Telco Domain
Part II: Capacity Planning of SOA-Based Systems
Service Technology Magazine (Issue LIV , September 2011)
For example, the maximum header parts will contain 2,048 bytes, and body payload will contain 327 bytes. So,
we will have 2,375 bytes overhead.
In the next activity, service-X will load subscriber profile (subscriber number and soccd) from database based
on msisdn. Subscriber number and soccd will then be mapped with the request payload body. For example
subscriber number will have 32 bytes at maximum and soccd will have 16 bytes at maximum. Second actvitiy
will give additional 48 bytes on memory usage.
In third activity, service-X will register the subcriber number to the corresponding package based on the soccd
and keyword being input. Return value of this activity is only a boolean values, which takes 1 byte of data. So,
in this activity will give additional 1 byte on memory usage.
Unlike in the previous activities, the value of the fourth activity varies based on the package that the subcriber
has been registered to. But we can take the maximum value of it into take account. For example, to have a
good response message (which is defined by marketing team) we need 256 bytes. We can use this number as
a guideline. In the last activity, the response message will only be sent out through defined channels (UMB or
SMS).
If we sum all of the activities above, we will have the following estimation:
# Activity Header Body Extra Payload Total
1 2048 327 24 2399
2 2048 327 48 2423
3 2048 327 1 2376
4 2048 327 256 2631
5 2048 327 0 2375
Total 329 12204
Table 3 – Memory Usage Estimation for Service-X
For single transaction service-X will at least need 12204 bytes of memory. As mentioned in the previous
example, if service-X will run at 150 tps per service instance, it will need at least 1,830,600 bytes of memory
(around 1,74 MB).
Capacity Planning on Infrastructure Level
Platform is a system where applications run. However, not all applications can run in multi-platforms. So
because the platform is the base foundation system in order for applications to run, we need to make sure
it has the availability and scalability to keep the growth of the application. Some important aspects of the
platform capacity are the processing unit, memory, and storage. In SOA-based system, there are Enterprise
Service Bus system, Messaging Bus system, and Database system (optional) that need to have good capacity
planning in terms of platform capacity aspects.
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