Hello,
While reading the BI4 Sizing guide again after some time, I was wondering about two things:
- The info about APS DSL maximum heap sizing (-xmx) in several places, e.g. page 40:
"Memory is calculated based on the number of expected active concurrent users as follows:
0.25 GB per active concurrent user
8 GB minimum
30 GB maximum"
This is strange, since in openSAP training - BI 4 Platform Innovation and Implementation we were told that
the maximum heap size for any APS shouldn't be higher than 8GB, to avoid garbage collection issues.
But when looking at the given calculation formula, our APS DSL should have around 12,5 GB.
What is your experience with that?
- The number of Web Intelligence Processing Servers (WIPS), e.g. page 39:
"When adding additional WebI instances, it is recommended that each instance run on a separate
machine in order to maximize the I/O capacity available to the servers."
Because we had a lot of issues with WebI performance in the past, we were advised to increase
the number of WIPS on our BIP by SAP consulting. This should also ensure (better) load balancing.
Now we have two WIPS for DEV/QA and four for PRD, but these are all single node systems.
What is your experience with this?
Is this mentioned I/O bottleneck when having more than one WIPS on the same node really there?
On the other hand: are there any issues possible when having only one WIPS in the PRD deployment (loadbalancing, etc.)?
Since we have around 50 ACU, one WIPS should be enough when looking at the sizing guide, but I'm wondering about the side effects.
(We are running 4.1 SP2 patch 1 on W2k8 R2)
Best Regards
Moritz