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The installation and activation of any pre-planned memory requires the purchase of the required feature codes (FCs), as listed in Table 2-8. 

<img src='content_image/1014526.jpg'>

The payment for plan-ahead memory is a two-phase process. One charge occurs when the plan-ahead memory is ordered. Another charge occurs when the prepaid memory is activated for use. For more information about the exact terms and conditions, contact your IBM representative. 

Pre-planned memory is installed by ordering FC 1993 (8 GB) or FC 1996 (16 GB). The ordered amount of plan-ahead memory is charged at a reduced price compared to the normal price for memory. One FC 1993 is needed for each 8 GB of usable memory (10 GB RAIM), or one FC 1996 is needed for each 16 GB of usable memory (20GB RAIM). 

## 2.6 Reliability, availability, and serviceability 

Reminder:  Maximum amount of preplanned memory is limited to 2TB 

IBM Z servers continue to deliver enterprise class RAS with IBM z14 ZR1 servers. The main philosophy behind RAS is about preventing or tolerating (masking) outages. It is also about providing the necessary instrumentation (in hardware, LIC and microcode, and software) to capture or collect the relevant failure information to help identify an issue without requiring a reproduction of the event. These outages can be planned or unplanned. Planned and unplanned outages can include the following situations (examples are not related to the RAS features of IBM Z servers): 

GLYPH<SM590000> A planned outage because of added processor capacity 

GLYPH<SM590000> A planned outage because of added I/O cards 

GLYPH<SM590000> An unplanned outage because of a power supply failure 

GLYPH<SM590000> An unplanned outage because of a memory failure 

