## 11.5 HMC and SE key capabilities 

The HMC and SE feature many capabilities. This section describes the key areas. For more information about these capabilities, see the HMC and SE (Version 2.14.0) console help system or IBM Knowledge Center. 

## 11.5.1 Central processor complex management 

At IBM Knowledge Center, click IBM Z . Then, click z14 . 

The HMC is the primary place for CPC control. For example, the input/output configuration data set (IOCDS) includes definitions of LPARs, channel subsystems, control units, and devices, and their accessibility from LPARs. IOCDS can be created and put into production from the HMC. 

The HMC is used to start the power-on reset (POR) of the server. During the POR, processor units (PUs) are characterized and placed into their respective pools, memory is put into a single storage pool, and the IOCDS is loaded and initialized into the hardware system area (HSA). 

The hardware messages task displays hardware-related messages at the CPC, LPAR, or SE level. It also displays hardware messages that relate to the HMC. 

## 11.5.2 LPAR management 

Use the HMC to define LPAR properties, such as the number of processors of each type, how many are reserved, and how much memory is assigned to it. These parameters are defined in LPAR profiles and stored on the SE. 

Because Processor Resource/Systems Manager (PR/SM) must manage LPAR access to processors and the initial weights of each partition, weights are used to prioritize partition access to processors. 

You can use the Load task on the HMC to perform an IPL of an operating system. This task causes a program to be read from a designated device, and starts that program. You can perform the IPL of the operating system from storage, the HMC DVD-RAM drive, the USB flash memory drive (UFD), or an FTP server. 

When an LPAR is active and an operating system is running in it, you can use the HMC to dynamically change certain LPAR parameters. The HMC provides an interface to change partition weights, adds logical processors to partitions, and adds memory. 

LPAR weights can also be changed through a scheduled operation. Use the Customize Scheduled Operations task to define the weights that are set to LPARs at the scheduled time. 

Channel paths can be dynamically configured on and off (as needed for each partition) from an HMC. 

The Change LPAR Controls task for z14 servers can export the Change LPAR Controls table data to a comma-separated value (. csv )-formatted file. This support is available to a user when they are connected to the HMC remotely by a web browser. 

Partition capping values can be scheduled and are specified on the Change LPAR Controls scheduled operation support. Viewing more information about a Change LPAR Controls scheduled operation is available on the SE. 

