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resizing

Basis (Basis Technology Modules: Basis Component/System Administration, GUIs)

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resizing

Postby Geeth » Tue Jul 22, 2014 8:58 pm

Hi Guru,

In my ECC system, we are planning to add 500 more users. Please let me know what I should consider to increase like cpu and memory?

Thanks
Geeth
Geeth
 
Posts: 69
Joined: Sun Mar 14, 2010 8:10 pm

Re: resizing

Postby Zavaros » Thu Jul 24, 2014 12:28 pm

Hello,

I assume you have checked the quicksizer already. ( http://service.sap.com/quicksizer )

Btw the given information is not enough for sizing. 500 additional entries in USR02 table causes no extra load. :roll:

the sizing depends on the current load of the system and on increment.
How many users do you have currently ?
In average what percent of work processes are used during peek load?

Regards,
Zav
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Re: resizing

Postby Geeth » Sun Jul 27, 2014 2:03 am

Thanks Zav, presently I have 300 user and 50 active users. Could you please tell me what else we need to check.

Thanks
Geeth
Geeth
 
Posts: 69
Joined: Sun Mar 14, 2010 8:10 pm

Re: resizing

Postby Zavaros » Tue Jul 29, 2014 7:51 am

Hello,

DIA processes:
check the number of used DIA work processes in SM50 and add it to the total DIA number.
- DIA process is not used if CPU time is below 1 sec.
- Be aware that operation mode switch resets the CPU time of switched processes.
- if all DIA processes were heavily used then you should check the DIA wait time in ST03 (not the roll wait!)

BTC processes:
same procedure with remark that if all BTC processes were used then you should check in SM37 the delay of jobs. if there are jobs with delay more than 60 seconds then the you should add more BTC processes.

other processes:
SPO, UPD, UDP2 -- you can double them and then fine tune after a month of run.


CPU/memory.
It is not trivial. As rough approximation I would suggest quicksizer for both.
You can increase the heap and EM by 50% but there is no good heuristic. The system load highly depends on developers and user habits.

Database
here the quicksizer can help you to estimate the DB size increase. You set the memory and CPU according it... and fine tune.

Regards,
Zav

PS: heuristics above assumes
- minimal amount of synchronous interfaces
- no parallel data processing.
Zavaros
 
Posts: 756
Joined: Thu Oct 24, 2002 10:50 pm
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