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FusionCloud Solution Description 04

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VMware EVS

VMware EVS

What Is VMware Elastic Volume Service?

VMware Service provides VMware EVS for you to use VMware EVS disks. A VMware EVS disk is a scalable virtual block storage device that is based on the distributed architecture. By interconnecting VMware Service with VMware vCenter, VMware EVS disks can be centrally managed on ManageOne.


VMware EVS has the following advantages:

  • VMware EVS disks are more cost-effective than hard disks on physical servers.
  • VMware EVS facilitates virtual disk resource management.
  • VMware EVS disks avoid the bottleneck of traditional system disks. Physical memory is efficiently virtualized into a physical hard disk, so that data read and write of hard disk files are converted into data access to memory. Speed of accessing physical memory is much higher than that of the traditional hard disks. Therefore, the data read and write speed can be greatly improved, the hard disk bottleneck can be avoided, and the computer performance can be improved rapidly.
  • VMware EVS disks can be attached to a VMware ECS or detached from a VMware ECS in the region without stopping or restarting the server. Capacity of a VMware EVS disk can be flexibly configured and can be expanded on demand.

Application Scenarios

VMware EVS applies to the following scenarios (Figure 40-6 shows the details):

  • VMware EVS disks have higher data reliability and I/O throughput and are easier to use than hard disks on physical servers. VMware EVS disks can be used for file systems, databases, or system software or applications that require block storage devices.
  • VMware EVS disks provide high-performance and high-reliability data storage functions and are applicable to high-load and mission-critical service systems.
    Figure 40-6 Application scenarios of VMware EVS

Implementation Principles

Logical Architecture

and Figure 40-7 show the VMware EVS architecture.

Figure 40-7 VMware EVS architecture
Table 40-3 VMware EVS architecture description

Component Type

Component Name


VMware Service console


Provides the UI for VMware EVS Console.

Services of VMware EVS


Processes the operation request of VMware EVS Console.


Sorts and filters VMware EVS operation requests.


Processes VMware EVS operation tasks.

Common component


Provides level-1 load balancing.


Provides level-2 load balancing.


Provides domain name parsing and time synchronization capabilities.

API Gateway

Allows a third-party application to call VMware EVS APIs.


Provides a scalable platform that lays a foundation for virtualization management. VMware Service takes over EVS resources from the vCenter resource pool to ManageOne.

Resource pool


Provides identity identification and access management for VMware EVS disks.

Management domain


Provides the function of metering and charging resources.


Figure 40-8 shows the VMware EVS workflow.

Figure 40-8 VMware EVS workflow
  1. VDC administrators or VDC operators apply for VMware EVS disks from the ManageOne operation plane. VMware Service delivers the operation requests to Storage for processing.
  2. Scheduler filters and sorts the processed operation requests.
  3. CoreTask processes tasks in sequence.
  4. API Gateway distributes the requests for vCenter systems.

Related Services

VMware EVS: VMware EVS disks can be attached to VMware ECSs and used as scalable block storage devices, as shown in Figure 40-9.

Figure 40-9 Services related to VMware EVS

Accessing and Using VMware EVS

FusionCloud provides a web-based service management platform, which users can access with the ManageOne operation plane or API.

  • ManageOne operation plane

    Users can use the ManageOne operation plane to access the cloud service. If you are a VDC administrator, VDC operator, or have the operation rights for the cloud service, you can directly log in to the ManageOne operation plane and choose this cloud service on the Product List or Console menu.

  • API

    If you want to integrate the service into a third-party system for secondary development, you can access the service using API. For details, see the API reference of the cloud service in FusionCloud API Reference.

Updated: 2019-10-23

Document ID: EDOC1100063247

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