AIX Unix is an example of a proprietary Unix system. Similar arguments for and against this solution apply to HPUX and other commercial Unix options. Advantages of AIX Unix include:

• The operating system is stable and mature.
• The hardware is of high quality (though it is often expensive).
• Vulnerability to viruses is low, as this is not a mainstream platform.
• AIX Unix is backed by a large vendor.
• Hardware and driver compatibility issues will be minimal, since you are dealing with a single operating system vendor.

But there are significant disadvantages:

• People with AIX Unix experience are difficult to find.
• Finding sources for replacement hardware is difficult. Many IBM sales staff know nothing about this platform.
• AIX has declining market share. For that reason, it is not a priority for IBM.
• It is expensive. Buying redundant hardware and software is also expensive.
• It is not in common use. For this reason, AIX Unix customers are more likely to run into problems when using Iguana.

	Important Note For AIX Users Before you use Iguana on AIX, you must ensure that the 5300-10 Technology Level fix pack is installed. For details, see 5300-10 Technology Level Fix Pack Required To Run Iguana on AIX.