Sharepoint service log files grow rapidly

Recently I noticed that I run out disk space in my virtual machine where I install Windows sharepoint services.
I see that the log folder grows very big in size. It is already 2 GB now.
The default log folder is located here :
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\LOGS\
To avoid it consumes space in C, I change it to different folder which is achieved through:
Sharepoint central administration > Operations > Diagnostic logging.
Then I also change timer job definitions by disabling them (maybe I will enable them once I know more about sharepoint).

Installing Dynamic Ax 2009

After some years working with Axapta 3 and 4, today I tried installing Dynamic Ax 2009.
The first impression with Ax 2009 is that the software contains more options than Ax 4, and the installation guide is more detail.

I download the installer here and the demo data
here. Seems weird because usually all are packed into one installation source (DVD).
Note that partner source login is required to download.

I run the installer and create a new blank database. After installation checklist finished, I restored the demo data (which comes as database backup) and point the AOS to the demo data instead of blank database created during installation.
When I started the AOS service I got this error in the event viewer :

The version of the stored procedures in this database is different than that expected by the Application Object Server (AOS). You must set up a new instance of the AOS that points to this database to update the version of the stored procedures


Seems that the demo data is created using AOS of earlier version from the latest download. Looking at the SQL Server profiler, I found that the table SQLSYSTEMVARIABLES is accessed during service start. Comparing two databases (one created during installation and one from demo data), contents of this table are different, and the one from installer is newer.
So I run this statement into the demo data database :

delete from sqlsystemvariables;
insert into sqlsystemvariables select * from DynamicAx5Blank.dbo.sqlsystemvariables;

Then restart AOS and it works.