Os level

 

What the number 7200-04-01-1939 stand for?

7200, which means we're running AIX 7.2: TL -4, Service Pack 1,

The “1939” tells you that Service Pack came out in week 39 of 2019.

On the other hand, if you're moving to a version within the same release, referred to as “patching,” it's an update. That means it can be done using “smitty update_all,” even if it does require a reboot at the end of the update.

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last four digits show the release date of the Service Pack using the format YYWW 

These are packed together as Technology Levels (TLs) or Service Packs (SPs). The oslevel command reports the base and TL levels you have installed, and the “-s” flag includes service pack information.

If your system is running AIX 5.3 TL 6 or anything later, “oslevel -s” will look something like this: 6100-02-06-0943. Breaking that down, the first four numbers show the AIX base level. In this example, it's 6100, which means we're running AIX 6.1. Next is the Technology Level (TL), followed by the number of the Service Pack (SP). he last four digits show the release date of the Service Pack using the format YYWW (YY for the year, then WW for the week of the year). So, if your “oslevel -s” command reports 6100-02-06-0943, then you know you're on AIX 6.1, running TL 2, with SP 6. The “0943” tells you that Service Pack came out in week 43 of 2009. It’s time to update your system. See Figure 1 for some examples.

https://ibmsystemsmag.com/Power-Systems/11/2010/understanding-aix-versions