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. 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. 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.  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. Chapter 8. System upgrades  297 Description New build MES add PCIe+ I/O drawer 0 - 4 0 - 4 PCIe+ I/O drawer with 16U Reserved (FC 0617) a 0 - 2 0 - 2 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. Figure 8-4 Features on-Demand window for zBX blade feature HWMs Table 8-3 PCIe+ drawer summary 8.3.4 Feature on Demand