on 02-17-2012 9:57 AM
Dear Experts,
Assuming an initial sizing around 8GB RAM and two machines (64bits/RHEL5.5 for the AS and 64bits AIX5.3 for the DB).
I do not want to consider the zero administration option for the exercice.
20 high concurrent users : 10 DIA for 20 WP in total.
Are the following assumptions correct?
80% AS | 20% DB ie., 6,4GB RAM AS | 1,6GB RAM DB
On AS side (RHEL5.5):
SWAP > 20Go (64bits) or 3RAM ie., 6,43=19,2GB giving as result 26,4GB of virtual memory for the application server (RAM + SWAP) meaning I must dispatch 26,4 GB over ROLL_AREA + PAGE_AREA + EXTENDED_MEMORY + HEAP_MEMORY
ROLL_AREA = ztta/roll_area + ztta/roll_first (both of them are equal to 2GB)
PAGE_AREA = rdisp/PG_SHM = ???
EXTENDED_MEMORY = em_initial_size_MB = 15 * ztta/roll_extension or the complete address space ==> 26,4GB - 3*2GB - PAGE_AREA = 20,4GB - PAGE_AREA
HEAP_MEMORY = abap/heap_area_total = Data buffer + Shared Pool + 5 MB * (Nb. of work processes) + 50 MB or 20% of the virtual memory (< 2GB) ==> abap/heap_area_total = 2GB
On database side (AIX5.3):
Data Buffer + Shared Pool + Number of shadow*(5-10MB) = 1,6GB
PGA = 2,5MB * Number of shadow ~ 50MB
Data Buffer = Shared pool = 750 MB
Thanks in advance,
Best Regards,
Ludovic
Hello,
Please check note
941735 SAP memory management for 64-bit Linux systems
regards,
John Feely
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Going into details of SAP Note 941735:
For 64bits, es/implementation=std meaning the memory management should be done as UNIX systems.
Additionnally, kernel.shmall (RAM + SWAP) & TMPFS (75% *(RAM + SWAP)) are recommended.
Unfortunately, nothing to complete the exercice and setting up all parameters.
Kind Regards,
Ludovic
Hello
SAP memory management on 64-bit AIX should be configured according to the following
note 789477
ES/TABLE = SHM_SEGS (switches to the alternative implementation of Extended
Memory (EM) as per 789477.
EM/TOTAL_SIZE_MB is used, not em/initial_size_MB when 789477 is implemented.
Regards.
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