content_image/998232.jpg content_image/998234.jpg
For more information about PCIe+ I/O drawers, see 4.2, “I/O system  overview” on page 120. 

The number of PCIe+ I/O drawers that can be present in a z14 ZR1 server is listed in Table 8-3. 

<img src='content_image/998232.jpg'>

a. When FC 0617 is ordered for the machine, it cannot be removed at a later stage; for example, in favor of adding a third PCIe+ I/O drawer. 

Depending on the number of I/O features that are carried forward on an upgrade, the configurator determines the number of PCIe+ I/O drawers. 

 z/VSE, z/TPF, Linux on Z, and CFCC do not  provide dynamic I/O configuration support. Although installing the new hardware is done concurrently, defining the new hardware to these operating systems requires an IPL. 

Tip: z14 ZR1 servers feature a hardware system area (HSA) of 64 GB. HSA is not  part of the client-purchased memory. 

## 8.3.4 Feature on Demand 

Only one FoD LICCC record is installed or staged at any time in the system. Its contents can be viewed under the Manage window, as shown in Figure 8-4. 

<img src='content_image/998234.jpg'>

A staged record can be removed without installing it. An FoD record can be installed only completely; no selective feature or partial record installation is available. The features that are installed are merged with the CPC LICCC after activation. 

An FoD record can be installed only once. If it is removed, a new FoD record is needed to reinstall. A remove action cannot be undone. 

