Question about SAP + SLES10 + vSphere and the truth about memory

Hi,
we are using vSphere and SLES 10 for a SolutionManager 7.0 on MaxDB 7.6.
The system is configured with 2 GB RAM in the VM. The database is configured to use 125000 pages as cache (100000 KB).
Yes, I know the system is configured very small for this usage, but it is a demo system...
But the system is really slow. I can't figure out whats the problem.
The RAM is configured with 2 GB in the VM a "free" in linux shows me that there is 500 MB used for file system chache
             total       used       free     shared    buffers     cached
Mem:       2076908    2002704      74204          0      28936     578212
-/+ buffers/cache:    1395556     681352
Swap:      6185016    3037744    3147272
so this shoud be ok, for me it is close to the limit...
But VMware infrastruture client shows me, that there are only 300 MB of the 2GB is used ... but the database should use 1 GB and SAP should use some RAM , too.
So who tells the truth? Where does the RAM goes to if it is not used in VMware? Could this be the performance problem?
An other problem is, that the show dev_io of the database shows me very slow access to the files ...
i.e.
I/O via Device Processes:
  UNIX Devspace                                                Read    avg_read      Write  avg_write
   tid name                                                           count       time            count       time
28596 /sapdata/SYS/sapdata/DISKD01       6532     0.0294        101     0.2077
But VMWare shows that there is nearly no usage of DISK ... average is shown as 150 KBps...
So again, who tells the truth?
What else could be the problem?
Thank you.
Best regards
Christian

> I know 2 GB is less, but the system is still 32 bit Linux, so 6 GB is "impossible".
Why that? The 32bit limit is a per process limit, not a limit for the amount of total supported memory.
> During the long weekend the system is switched to an other VMServer I am going to request more RAM. What a pitty that 32 bit does not support more than 3 GB....
I don't know who told you that but it's wrong
> But there is still the question whats correct? The linux variant of free or the VMware infrastructure client monitoring the RAM?
> What could slow down the Database IO performance?
> USE_OPEN_DIRECT we are already using ...
Are you sure it's the I/O peformance? A couple of questions arise then:
- What filesystem is underneath?
- How are your data files distributed?
- What are your I/O times for a single I/O (you can switch that on using DB50 - TAsk manager - and press on the "clock", the time will then be displayed in the database analyzer.
If you use VMWare on a recent processor you can also switch nicely to a 64bit Linux.
Markus

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