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 Page 594 - Cloud computing: From paradigm to operation           Basic HTML Version Table of Contents View Full Version Page 594 - Cloud computing: From paradigm to operation P. 594 3 XaaS • basic information of a virtual desktop: virtual desktop ID, OS type, hypervisor type, current status; • H/W resource for virtual desktop: assigned memory space, the assigned number of CPUs, assigned storage space, virtual desktop's IP address, virtual desktop's MAC address, accessible port number, performance enhancement factor. – monitors the run-time information of virtualization infrastructure and virtual desktop. (...) NOTE 5 – Following are the controls at both sides: • DaaS user's controls: virtual desktop state controls such as on, create, reset, pause, resume, and off: – on/off: turn on or turn off a virtual desktop; – create: make a new virtual desktop; – reset: reboot the OS of a virtual desktop; – pause/resume: pause the OS maintaining a connection and resume the OS from a pause status; – delete: elimination of a virtual desktop. • administrator's controls: virtual desktop state controls, resource modification (CPU change, memory change, storage change, adding/deleting USB, network selection etc.), virtual desktop migration. 7.3.2 User account and profile management CSU's accounts are separated into two types as follows: 1) administrative account for an administrator who has the authority to control and manage a system; 2) general user account combined with CSC types such as service level, the type of virtual desktop, the authority of resource utilization, and the virtual desktop persistence user or not. (...) NOTE 3 – Since virtual desktop hardware profile depends on physical hardware in virtualization infrastructure, the physical hardware information from hypervisor or platform is collected and stored. – generates profiles from CSU's account information or the pre-configured virtual desktop environment (such as virtual desktop user profile or template).
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 Page 593 - Cloud computing: From paradigm to operation           Basic HTML Version Table of Contents View Full Version Page 593 - Cloud computing: From paradigm to operation P. 593 XaaS 3 – configures a pre-configured virtual desktop environment (such as an OS image and a user disk image) and stores it to share for convenience and speed of the configuration; – installs and updates software in a pre-configured virtual desktop environment as well as a DaaS platform; – deploys a DaaS platform which scales up, down, and out including redundancy; NOTE 2 – If a heterogeneous virtualization infrastructure is adopted, this function deploys it and prepares a new pre-configured environment compared with the previous user environment. – determines operating status of a DaaS platform and a virtual desktop according to CSC type; NOTE 3 – Based on the operating status, this function assigns a previously allocated virtual desktop, a temporary allocated virtual desktop, or a newly created virtual desktop on the optimum DaaS platform according to CSU's account information. NOTE 4 – The optimum DaaS platform has best-efforts performance from the monitoring of server power or performance among DaaS platforms. – identifies CSC type and service catalogue. 7.3 Virtual desktop resource management Virtual desktop resource management functions: – monitor and control states of virtual desktop resources (see clause 7.3.1 monitoring and controlling virtual desktop resource function); – manage user accounts and profiles in terms of administrators and DaaS users (see clause 7.3.2 user account and profile management function); – offer a virtual desktop and other resources to a DaaS user in a timely manner (see clause 7.3.3 virtual desktop resource allocation and distribution function); – establish operational policy (see clause 7.3.4 operational policy management for DaaS function); – offer high availability (see clause 7.3.5 high availability for DaaS function); – supply management of power consumption (see clause 7.3.6 power management of virtual desktop resource function). 7.3.1 Monitoring and controlling virtual desktop resource In the monitoring and controlling virtual desktop resource function, monitored and controlled targets for DaaS are mainly virtualization infrastructure and virtual desktops. (...) The monitoring and controlling virtual desktop resource function: – monitors the information of virtualization infrastructure to gather by event processing during running DaaS; NOTE 2 – The monitoring information of virtualization infrastructure is as follows: • basic information of virtualization infrastructure: machine's host name, machine type; • hardware (H/W) resource for virtualization infrastructure: total memory space, the number of CPUs, total storage space, machine's IP address, media access control (MAC) address, the availability for performance enhancement, estimated power; • virtualization related resource: hypervisor information, the number of currently running virtual desktops, the supported maximum number of virtual desktops, supported OSs. – monitors the information for each virtual desktop to gather by event processing; NOTE 3 – The monitoring information of virtual desktops is as follows: 585     588     589     590     591     592     593     594     595     596     597     598          
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 Page 591 - Cloud computing: From paradigm to operation           Basic HTML Version Table of Contents View Full Version Page 591 - Cloud computing: From paradigm to operation P. 591 XaaS 3 7.2 Virtual desktop connection and delivery Virtual desktop connection and delivery functions: – perform a delivery protocol (see 7.2.1 delivery protocol processing function); – connect virtual desktops for a DaaS user (see 7.2.2 client connection management function); – validate a DaaS user with user authentication (7.2.3 user access management function); – establish a virtual desktop for a DaaS user (7.2.4 provisioning and allocation function). 7.2.1 Delivery protocol processing The delivery protocol processing function: – provides the communication channels through the network for exchanging information between the DaaS client and the DaaS platform; NOTE 1 – Examples of exchanged information by the delivery protocol processing function are virtual desktop's display, video and audio data, events of input devices (e.g., mouse, keyboard), and events of other DaaS client peripherals. – transmits virtual desktop environments to the DaaS client after the coordination process performed by the client connection management function (see clause 7.2.2) and the connection to the virtual desktop by the DaaS client with the virtual desktop access information; NOTE 2 – Virtual desktop access information includes the information for connecting virtual desktop such as internet protocol (IP) address, URI, port number of the DaaS platform, port number of assigned virtual desktop, and password for secure connection. – redirects virtual desktop's graphic display to a DaaS client; – provides the compressed display to decrease the network bandwidth for high resolution and dimension display data; – transmits video/audio data encoded and decoded with standard codec for each applicable video/audio content; – determines connection negotiation results based on monitoring information received from the connection negotiation function (see clause 7.4.2) and the monitoring and controlling virtual desktop resource function (see clause 7.3.1); NOTE 3 – Connection negotiation result includes screen resolution, compression rate of video and audio, transmission rate of display, and kind of video and audio codec. – uses standard security protocols in order to protect the content exchanged between a DaaS client and a DaaS platform. 7.2.2 Client connection management The client connection management function: – establishes a connection to a DaaS client after DaaS user's authentication related with the user access management function (see clause 7.2.3); – identifies CSC types (e.g., allocated user, pooled user, multi-virtual machine (VM) user) which were previously assigned from CSU's account information; NOTE 1 – The allocated user uses its own allocated virtual desktop persistently and has its own permanent virtual desktop by adopting a pre-set method and a manual method. NOTE 2 – The pooled user has a non-persistent virtual desktop for one-time use only. When the user terminal, divided as the pooled user is logged off from the operation server, the virtual desktop used by the user terminal is deleted. (...) NOTE 3 – The multi-VM user is allowed to use multiple virtual desktops. NOTE 4 – CSU's account information is registered by an administrator at the portal of a DaaS platform or the administrator's terminal to approve a DaaS user's prior permission.
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A hypervisor can abstract physical hardware resources and assign them dynamically to a virtual desktop. In this case, the end user's application runs on the virtual desktops provided by the virtualization infrastructure. (...) DaaS can be serviced by either a personalized virtual desktop or by a virtual desktop from a shared pool. In the case of a personal virtual desktop, there is a one-to-one mapping between a virtual desktop and a cloud service user.
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Score: 1227483.6 - https://www.fao.org/fileadmin/...s/events2018/landnet11/7.3.pdf
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 Page 595 - Cloud computing: From paradigm to operation           Basic HTML Version Table of Contents View Full Version Page 595 - Cloud computing: From paradigm to operation P. 595 XaaS 3 7.3.3 Virtual desktop resource allocation and distribution The virtual desktop resource allocation and distribution function is manually accessed by an administrator or dynamically operated by the operational policy management function (see clause 7.3.4). The virtual desktop resource allocation and distribution function: – receives the resource usage from the monitoring and controlling virtual desktop resource function (see clause 7.3.1) and provides an administrator or a resource scheduler with the analysis of resource usage statically or dynamically; NOTE – This analysis includes the resource usage state, resource usage pattern, and modification history, etc. (...) Otherwise, this function considers power consumption or utilization of the platform according to the weighted resource usage or the number of virtual desktops operated in one platform and sets the policy on the lowest utilization rate or the fewest number of virtual desktops.
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A few technologies can be used for providing services of the DaaS like virtual desktop infrastructure (VDI) and web-based solutions with various delivery protocols such as the virtual desktop delivery protocol and the web-based delivery protocol shown in Figure 6-2. (...) A virtual desktop is executed for each user from the server side. Users access this environment remotely through DaaS clients, with all virtual desktop associated processing. A virtual desktop delivery protocol is used to deliver the virtual desktop.
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. • Classification based on virtual desktop environment – The CSC can be classified depending on the types of virtual desktop environment. For example, some CSCs can be serviced with a virtual desktop with OS desktop in itself, and others can be serviced with a web application of virtual desktop. Also, this is related with the type of virtual desktop. • Classification based on the allocation of the virtual desktop environment – A CSC can be served with the permanently allocated virtual desktop environment, while others can be served with a temporary virtual desktop in a virtual desktop pool. • Classification based on the demand of resources – A CSC can be served with the virtual desktop environment of the predefined configuration or the pre-set virtual image, while others can be served with the virtual desktop environment using CSC manual configuration and resource management.
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Score: 1223116.1 - https://www.fao.org/fileadmin/.../Events2016/vggt_bp/pres/3.pdf
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. – performs the scheduling from the policies about a DaaS user's usage pattern and power consumption in virtualization infrastructure; – sends a policy to the allocation function (see clause 7.2.4) to select the virtualization infrastructure to operate a virtual desktop; – establishes a backup policy which covers types and frequency of backing up the virtual desktop enviorment to prepare for a system disaster; – provides user interfaces for established policies which are established and applied dynamically or manually by the administrator. 7.3.5 High availability for DaaS For high availability, DaaS adopts platform clustering which includes connection manger and virtualization infrastructure to maintain the seamless DaaS user's connection in a failure occurrence situation. (...) It helps to allocate a virtual desktop by load balancing or migrating a virtual desktop to the activated server to a DaaS client when the failure occurs on the server to which the virtual desktop is allocated, by providing a service without the loss of the user environment. – saves the user's environment during a certain time and backs up and restores it on a local disk or on shared storage, thus preventing the loss of the user environment. 7.3.6 Power management of virtual desktop resource The power management of virtual desktop resources function manages the power consumption of a DaaS platform with virtual desktop resources. This function: – monitors the power consumption and the related performance factors of a virtual desktop and each resource in a DaaS platform; – calculates the variation of power consumption and performance of a virtual desktop or a DaaS platform by collecting monitoring information; – supports other functions for the provisioning and allocation of virtual desktop function (see clause 7.2.4) or the operational policy management for DaaS function (see clause 7.3.4). 588     591     592     593     594     595     596     597     598     599     600     601          
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