Linux; Hardware Configuration Definition (Hcd) - IBM Z9 Planning Manual

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Linux

Linux for S/390
v Support for FICON Express2 (CHPID type FC), including Channel-To-Channel
(CTC)
v Support for FICON Express2 (CHPID type FCP) for support of SCSI disks
v OSA Express2 large send (also called TCP segmentation offload)
v Linux-Only mode
v 16 CPs
v 2048 MB of central storage
v 262144 MB of expanded storage
v 256 channels
v PKCS #11 API support for zSeries PCI Cryptographic Accelerator Feature
v WLM Management of shared logical processors
v Performance assist via passthrough of adapter interruptions for FCP, IQD, and
OSD CHPID types
v PCIXCC support
v Support for zSeries Crypto Express2 feature only for SSL functions (available on
release 7 only). Support for clear key RSA operations only.

Hardware Configuration Definition (HCD)

You can use HCD's interactive panels to define configuration information both to the
CPC and to the operating system.
Note: HCD and Hardware Configuration Manager (HCM) are also available on
z/VM.
HCD, running on z/OS allows you to dynamically change the current I/O
configuration of the CPC. HCD allows you to dynamically change the current I/O
configuration of the operating system and to create a new IOCDS and make it the
active IOCDS.
HCD is required to define the I/O configuration to the operating system. HCD is also
the recommended way to define hardware configurations.
The HCD component of z/OS allows you to define the hardware and software I/O
configuration information necessary for a parallel sysplex solution environment,
including the capability to define:
v peer-mode channel paths (CFP, CBP, CIB, and ICP) to connect z/OS systems to
coupling facility images, and
v peer-mode channel paths (CFP, CBP, CIB, and ICP) to connect coupling facility
images to one another, in support of System-Managed CF Structure Duplexing.
Additionally, HCD allows you to remotely write IOCDSs from one support element
CPC to another support element CPC as long as both support elements are
powered-on, LAN-attached, enabled for remote licensed internal code (LIC) update,
and defined to the same Hardware Management Console.
Dynamic I/O configuration does not support the following:
v Adding/deleting MIF image IDs from the initial ones in the IOCDS. (However, you
can change which LPs go to which MIF image IDs).
When using HCD in z/OS, you can define and control the configuration of the CPC
affecting all LPs. Those LPs that run with HCD or z/VM can dynamically change
their software configuration definitions. Other LPs may require an IPL in order to
use the new configuration.
Chapter 1. Introduction to Logical Partitions
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