Our team is planning to request additional RAM to resolve the performance issue in the sap instance.
Please help me to calculate how much memory can be requested.
OS : AIX 7.1
SAP : SAP NW 7.5
DB : Oracle 12.1
Total RAM allocated to the server : 20GB
Total Paging allocated to the server : 24GB
As per the ST02 - Detailed analysis - Storage
1)Storage Shared Between Work Processes = 3.792271614 GB
2)User storage for all work processes = 2.144439697 GB
3)Size of SAP executables (Disp+Work) = 0.085132599 GB
4)Size of Extended Memory = 6 GB
5)Maximum heap area for all work processes = 3.725290298 GB
Total (1+2+3+4+5) - SAP = 15.7GB
Please let me know Whether we need to include Heap memory in the total or we can ignore this and calculate only 1+2+3+4?
Oracle memory requirement (SGA + PGA) = 8GB
OS memory requirement = 3GB
Diagnostic agent memory Requirement = 1GB
Grand Total (SAP+ORACLE+OS+DAA) = 27.7GB
System is configured with
14 Dialog process (250MB Per work process)
4 BG process (750MB Per work process)
3 Update process (750MB Per work process)
1 spool process (750MB Per work process)
2 Update 2 process (750MB Per work process)
If we calculate the work process, it will come to around 11GB.
I am little bit confused whether we need to add this 11GB in the Grand total(27.7GB) =38.7GB
Please let me know whether i have to request additional 8GB of RAM or 18 GB of RAM to avoid performance issue?