Page 186 - Cloud computing: From paradigm to operation

1 Framework and requirements for cloud computing

SAS Serial Attached SCSI

SATA Serial AT Attachment
SCSI Small Computer System Interface

SEL System Event Log
SoC System-on-a-Chip

SRAM Static Random Access Memory
TCP Transmission Control Protocol
UART Universal Asynchronous Receiver/Transmitter

USB Universal Serial Bus
VGA Video Graphics Array

VM Virtual Machine

5 Conventions
In this Recommendation:
The keywords "is required to" indicate a requirement which must be strictly followed and from which no
deviation is permitted if conformance to this document is to be claimed.
The keywords "is recommended" indicate a requirement which is recommended but which is not absolutely
required. Thus this requirement need not be present to claim conformance.

The keywords "is not recommended" indicate a requirement which is not recommended but which is not
specifically prohibited. Thus, conformance with this specification can still be claimed even if this requirement
is present.
The keywords "can optionally" indicate an optional requirement which is permissible, without implying any
sense of being recommended. This term is not intended to imply that the vendor's implementation must
provide the option and the feature can be optionally enabled by the network operator/service provider.
Rather, it means the vendor may optionally provide the feature and still claim conformance with the
specification.

6 Overview of the physical machine

6.1 Introduction to the computing machine

Cloud infrastructure includes processing, storage, networking and other hardware resources, as well as
software assets, for more information see clause 6 in [ITU-T Y.3510]. Processing resources are used to provide
essential capabilities for cloud services and to support other system capabilities such as resource abstraction
and control, management, security and monitoring.
A computing machine provides allocation and scheduling of processing resources. Types of computing
machine are physical or virtual [ITU-T Y.3510]. The capability of a computing machine is typically expressed
in terms of configuration, availability, scalability, manageability and energy consumption [ITU-T Y.3510].
The requirements of the virtual machine, as one of categories of the computing machine, have been specified
in [ITU-T Y.3510]. Those requirements include virtualization technologies that can be applied to resource
types such as the central processing unit (CPU), memory, input/output (I/O) and network interfaces. Several
requirements regarding virtual machine management have also been identified, e.g., duplication of a virtual
machine (VM) dynamic/static migration of aVM and management automation.

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