Managing LPARs with ZETALY Automated Capacity©

Warning about HMC use

ZETALY Automated Capacity© applies a constant control on your Defined Capacity sum (CPCMAX, CMPMAX general parameter) and works within this sum.

If you directly use the HMC to change Defined Capacities for some LPARs, you must ensure consistency with the CPCMAX or CMPMAX parameters.

In fact, if your HMC change makes the sum of the DCs exceed the value of CPCMAX or CMPMAX, then ZETALY Automated Capacity© will adjust the sum of the DCs to the Maximum limit. In this case it is possible that ZETALY Automated Capacity© forces to steal MSUs from an important LPAR and thus affect its behavior.

In this case, an ASC0706W warning message is sent.

If your HMC static change makes the sum of the DCs become lower than the value of CPCMIN or CMPMIN, then processing continues and the ASC0707W warning message is sent.

IPL & LOAD method

The Defined Capacity (DC) and Weight parameters set by ZETALY Automated Capacity© are stored in the current image profile located in HSA: it is a “warm” setting.

It is better to remain consistent with ZETALY Automated Capacity© CPCMAX or CMPMAX value. Then to make an IPL, you may perform a single LOAD because the LOAD action uses the current LPAR definition loaded into HSA memory.

On the other hand, an ACTIVATE reloads for this LPAR the Image Profile definitions such as DC, Weight, NB CP, memory, Clock, etc., which are stored into the HMC (cold setting).

For example, if the current LPAR DC from HSA memory is lower than the Image Profile DC and if you request an ACTIVATE for this LPAR, the value of CPCMAX or CMPMAX will be exceeded. ZETALY Automated Capacity© will adjust the sum of the DCs to the value of CPCMAX or CMPMAX at the next interval, but you must be careful as explained in chapter 8.1 “Warning about HMC use”, above.

We recommended paying attention to this fact when you manage your images on the CPC.