Planning for the IBM AIX Dynamic System Optimizer

There are following considerations when you are planning to use the AIX Dynamic System Optimizer.

• The Active System optimizer (ASO) daemon is started at boot time, but it is inactive by default. It can be activated by using the asoo command.
• The ASO daemon is supported on the following versions of the AIX® operating system and POWER® processors:

  AIX version	POWER processor
  AIX 7.2, or later	POWER7
  AIX 7.2 Service Pack 2, or later	POWER8
  AIX 7.2 with Technology Level 3, or later	POWER9
  AIX 7.3 with Technology Level 1, or later	Power10

• Running ASO in a dedicated processor environment requires that Virtual Processor Management (core folding) is disabled, which is the default setting. Enabling Power® Management on the Hardware Management Console (HMC) enables Virtual Processor Management to be started in a dedicated environment and disables ASO.
• Enabling Active Memory Sharing disables all the optimizations except data stream prefetch optimization.
• When processor resources are capped in a shared processor LPAR (SPLPAR) environment, the system entitlement must be a minimum of two cores. The entitlement for each virtual processor must be high enough to ensure that ASO can optimize the workload.
• For large page optimization, the system must have a minimum of 16 GB of system memory.