Updated on 2024-09-25 GMT+08:00

Overview

What Is EVS?

Elastic Volume Service (EVS) provides scalable block storage for FlexusX instances. With high reliability, high performance, and varied specifications, EVS disks can be used for distributed file systems, development and testing environments, data warehouses, and high-performance computing (HPC) scenarios to meet diverse service requirements.

Related Operations

Operation

Description

Adding an EVS Disk

  • You can purchase data disks when purchasing FlexusX instances, but the disks must be initialized before you can use them.
  • You can also purchase data disks after purchasing FlexusX instances.
    • Disks created from data sources, such as backups or snapshots, do not need to be initialized.
    • Disks that are not created from data sources must be initialized before you can use them.

Attaching an EVS Disk

After a FlexusX instance is created, if the EVS disks on the instance cannot meet service requirements, you can attach existing disks to the FlexusX instance.

Detaching an EVS Disk

  • If a file system on your system disk is damaged and your FlexusX instance cannot be started, you can detach the system disk and attach it to another FlexusX instance as a data disk. After the file system is fixed, you can attach the disk back to the original FlexusX instance as the system disk.
  • If you want to move a data disk from one FlexusX instance to another in the same region and AZ, you can detach the data disk and then attach it to that FlexusX instance.
  • If you no longer need an EVS disk, you can detach and delete it.

Expanding the EVS Disk Capacity

If the disk capacity of your FlexusX instance is not enough, you can expand the capacity.

Initializing a Data Disk

Data disks must be initialized before they can be used, regardless of whether they are created together with FlexusX instances or created separately and attached to the FlexusX instances. An initialized data disk does not need to be initialized again.

NOTE:
  • System disks do not need to be initialized.
  • Data disks containing data do not need to be initialized.