Is my POWER7 system AME capable? Is AME supported with SAP in production?
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A colleague of mine contacted me during the week to ask how one could determine if a POWER7 system was capable of Active Memory Expansion. I thought I'd share my response with everyone who follows my blog.
You can check if the system is capable of providing Active Memory
Expansion (AME), from the HMC command line using the lssyscfg command, as shown here:
Once you’ve concluded that your POWER7 system is
AME capable, the next step is to check if AME is enabled or disabled for
an LPAR. This is easily done from the AIX command line with the lparstat and/or amepat commands, as shown in the following example:
-i| grep Exp
;Running lparstat and amepat on a LPAR with AME enabled.
$ lparstat -i | grep -i exp
Target Memory Expansion Factor : 1.00
Target Memory Expansion Size : 6144 MB
$ amepat | grep -i exp
WARNING: Running in no modeling mode.
Active Memory Expansion : Enabled
Target Expanded Memory Size : 6.00 GB
Expansion factor : 1.00
way, did you know that AME is now supported in SAP production environments running
on AIX and POWER7? Both SAP application servers, as well as database servers
running DB2 LUW are supported. Unfortunately there’s no support for LPARs with
Oracle RDBMS at this stage. Thanks to George Manousos from IBM Australia for
providing me with this update.
Please refer to the following SAP note.
The SAP note also states:
Specific tests have been successfully executed with SAP ERP 6.0 (ABAP)
workload. The results of those test can be found in the following whitepaper:
As AME is not recommended with large page support, AME will disable AIX
64KB pages by default.
AME monitoring capability in CCMS
Monitoring capabilities are available with saposcol v12.46 for more details see SAP note 710975.
It looks as though SAP have been quick to support AME on AIX/POWER7. This is a great benefit to SAP customers running with PowerVM on the IBM POWER platform. The following screenshot shows the SAP CCMS with AME statistics being reported.
PowerVM Integration into SAP CCMS Monitoring
expanded to include Virtualized Memory Metrics
For those who are not familiar with what AME actually is and how it can benefit you, I suggest you take a look at the IBM AME Wiki site first:
And watch Nigel Griffiths AME movie: