Memory Memory can be added concurrently up to the physical installed memory limit. More processor  drawers can be installed concurrently, which allows further memory upgrades by LICCC, and  enables memory capacity on the new processor drawers. By using the previously defined reserved memory, z/OS operating system images, and z/VM  partitions, you can dynamically configure more memory online. This process allows  nondisruptive memory upgrades. Linux on Z supports Dynamic Storage Reconfiguration. I/O I/O features can be added concurrently if all the required infrastructure (I/O slots and PCIe  Fanouts) is present in the configuration. PCIe+ I/O drawers can be added concurrently  without planning if free space is available in one of the frames and the configuration permits. Dynamic I/O configurations are supported by certain operating systems (z/OS and z/VM),  which allows nondisruptive I/O upgrades. Dynamic I/O reconfiguration on a stand-alone  coupling facility system is also possible using the Dynamic I/O activation for stand-alone CF  CPCs features  Cryptographic adapters Crypto Express7S features can be added concurrently if all the required infrastructure is in  the configuration. Special features  Special features such as zHyperlink, Coupling Express LR, and RoCE features can be added  concurrently if all infrastructure is available in the configuration. 8.10.2 Concurrent upgrade considerations By using an MES upgrade, On/Off CoD, CBU, or CPE, a z15 server can be upgraded  concurrently from one model to another (temporarily or permanently).  Enabling and using the extra processor capacity is not apparent to most applications.  However, certain programs depend on processor model-related information, such as ISV  products. Consider the effect on the software that is running on a z15 server when you  perform any of these configuration upgrades.  Processor identification The following instructions are used to obtain processor information:  GLYPH<SM590000> Store System Information (STSI) instruction  The STSI instruction can be used to obtain information about the current execution  environment and any processing level below the current environment. It can be used to  obtain processor model and model capacity identifier information from the basic machine  configuration form of the system information block (SYSIB). It supports concurrent  upgrades and is the recommended way to request processor information.  GLYPH<SM590000> Store CPU ID (STIDP) instruction STIDP returns information that identifies the execution environment, system serial  number, and machine type.  Note:  To ensure unique identification of the configuration of the issuing CPU, use the STSI  instruction specifying basic machine configuration (SYSIB 1.1.1). Chapter 8. System upgrades  375