2 Replies Latest reply: Mar 2, 2012 12:58 PM by Kenneth Maguire RSS

RAM upgrade

hitesh kumar
Currently Being Moderated

Hi Experts,


In my landscape SAP is running on HPUX. We have clustered environment. Oracle is on different host. We have having performance issue in SAP application host because of memory. All the time memory is more than 95% used. RAM is 16GB and virtual memory is 24GB. Now to improve the performance we need to upgrade system RAM. I am not very much sure how to calculate how much more RAM is required. Shall I upgrade it from 16 to 24GB? Is there any calculations which helps to find out how much RAM needed in a server.

  • Re: RAM upgrade
    Vincent Lim
    Currently Being Moderated

    I think the monitoring should be done via the standard transaction, i.e ST02, ST03, ST06, ST04 to determine the usage and workload.


    But do refers to standard SAP note on HPUX, i.e:

    172747     SAP on HP-UX: OS kernel parameter recommendations

    1075118   SAP on HP-UX: FAQ

    146528     Configuration of R/3 on hosts with much RAM

    1112627   SAP on HP-UX: Recommendations for swap and pseudo swap

    837670     Minimum OS patch recommendations for HP-UX


    Hope this helps.




  • Re: RAM upgrade
    Kenneth Maguire
    Currently Being Moderated



    Some memory tools for your analysis:

    ST02 -> Detailed Analysis Menu -> SAP Memory

    -> Ext. Memory Blocks &  Mode List, allow you to monitor memory.


    SM04 -> Goto -> Memory gives you a snapshot of memory being used but

                no history.


    Note #649327 (Analysis of memory consumption) also gives related



    By calling Transaction SM04 and choosing 'Goto' -> 'Block list',

    you can display an overview of the current roll and paging memory

    levels resulting from active users and their transactions. Try to

    decide from this whether another program requires a lot of memory

    space (perhaps too much). Also st02 is useful also.