Terminology for Logical Domains


Terminology for Logical Domains
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The following terminology is helpful in configuring the Veritas software in Logical Domains.

Table: lists the terminology for Logical Domains

Term	Definition
LDom	Logical Domain or Virtual Machine with its own operating system, resources, and identity within the same physical host.
Hypervisor	A firmware layer that provides a set of hardware-specific support functions to the operating systems running inside LDoms through a stable interface, known as the sun4v architecture. The hypervisor is interposed between the operating system and the hardware layer.
Logical Domains Manager	Software that communicates with the Hypervisor and logical domains to sequence changes, such as the removal of resources or creation of a logical domain. The Logical Domains Manager provides an administrative interface and keeps track of the mapping between the physical and virtual devices in a system.
Control domain	The primary domain which provides a configuration platform to the system for the setup and teardown of logical domains. Executes Logical Domains Manager software to govern logical domain creation and assignment of physical resources.
I/O domain	Controls direct, physical access to input/output devices, such as PCI Express cards, storage units, and network devices. The default I/O domain is the control domain.
Guest domain	Utilizes virtual devices offered by control and I/O domains and operates under the management of the control domain.
Virtual devices	Physical system hardware, including CPU, memory, and I/O devices that are abstracted by the Hypervisor and presented to logical domains within the platform.
Logical Domains Channel (LDC)	A logical domain channel is a point-to-point, full-duplex link created by the Hypervisor. LDCs provide a data path between virtual devices and guest domains and establish virtual networks between logical domains.
Virtual Disk Client	A Solaris kernel module in the guest logical domain which controls the virtual disks visible to that guest, providing standard device interfaces to applications.
Virtual Disk Server	A Solaris kernel module in the control domain which is responsible for exporting various backend devices as virtual disks to guest logical domains.