Elastic Volume Service
Elastic Volume Service
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What's New
Function Overview
Service Overview
EVS Infographics
What Is EVS?
Disk Types and Performance
Device Types
Billing
Billing for EVS Disks
Impacts and Usage Suggestions on Yearly/Monthly Disks Before and After Expiration
Impacts and Usage Suggestions on Pay-per-Use Disks Before and After Account Arrears
Permissions
Notes and Constraints
EVS and Other Services
Basic Concepts
EVS Concepts
Region and AZ
Three-Copy Redundancy
Disk Sharing
Disk Encryption
Disk Backup
Disk Snapshot (OBT)
Differences Between Disk Backups and Disk Snapshots
Getting Started
Buying and Preparing an EVS Disk for a Linux Server
Buying and Preparing an EVS Disk for a Windows Server
User Guide
Permissions Management
Creating a User and Granting EVS Permissions
EVS Custom Policies
Purchasing and Using an EVS Disk
Overview
Purchasing an EVS Disk
Attaching an EVS Disk
Attaching a Non-Shared Disk
Attaching a Shared Disk
Initializing EVS Data Disks
Initialization Overview
Initializing a Linux Data Disk (Less Than or Equal to 2 TiB)
Initializing a Linux Data Disk (Greater Than 2 TiB)
Initializing a Windows Data Disk
Attaching an Existing EVS Disk
Attaching an Existing Non-Shared Disk
Attaching an Existing System Disk
Attaching an Existing Shared Disk
Expanding the EVS Disk Capacity
Expansion Overview
Step 1: Expand Disk Capacity
Step 2: Extend Disk Partitions and File Systems
Extending Disk Partitions and File Systems (Linux)
Extending Disk Partitions and File Systems (Windows)
Managing EVS Snapshots (OBT)
EVS Snapshot Overview
Using EVS Snapshots
Creating an EVS Snapshot
Rolling Back Disk Data from a Snapshot
Creating a Disk from a Snapshot
Checking EVS Snapshot Details
Deleting an EVS Snapshot
Changing the EVS Disk Type (OBT)
Viewing EVS Disk Details
Detaching and Deleting an EVS Disk
Detaching an EVS Disk
Deleting an EVS Disk
Managing Encrypted EVS Disks
Managing Shared EVS Disks
Managing EVS Disk Backups
CBR Overview
Backing Up EVS Disks
Managing EVS Transfers
Managing EVS Tags
Tag Overview
Adding a Tag
Modifying a Tag
Deleting a Tag
Searching for Disks by Tag
Managing EVS Quotas
Querying EVS Resource Quotas
Increasing EVS Resource Quotas
Cloud Eye Monitoring
Basic EVS Monitoring Data
EVS Monitoring Data Included in OS Metrics (with Agent Installed)
EVS Events Supported by Event Monitoring
Setting an Alarm Rule
Recording EVS Operations Using CTS
Best Practices
Using LVM to Manage EVS Disks
Overview of EVS Disk Management Using LVM
Operation Process
Implementation Procedure
Installing LVM
Creating a Logical Volume Using LVM
Creating and Mounting a File System
Extending the Logical Volume Using the Unallocated Space
Extending the Logical Volume by Expanding Capacity of an EVS Disk
Extending the Volume Group by Adding an EVS Disk
Handling Insufficient Disk Space on a Windows ECS
Overview
Clearing Disk Space Using the System Built-in Cleanup Tool
Uninstalling Unnecessary Programs on Control Panel
RAID Array Creation with EVS Disks
Overview of Using EVS Disks to Create a RAID Array
Resource Planning
Implementation Procedure
Creating an ECS
Creating and Attaching EVS Disks
Extending Disk Partitions and File Systems (Linux Kernel Earlier Than 3.6.0)
Preparing for Extending Disk Partitions and File Systems (Linux Kernel Earlier Than 3.6.0)
Extending System Disk Partitions and File Systems (Linux Kernel Earlier Than 3.6.0)
Extending Data Disk Partitions and File Systems (Linux Kernel Earlier Than 3.6.0)
Extending SCSI Data Disk Partitions and File Systems (Linux Kernel Earlier Than 3.6.0)
API Reference
Before You Start
Overview
API Calling
Constraints
Concepts
API Types/Versions/Microversions
API Overview
Calling APIs
Making an API Request
Authentication
Response
Getting Started
Creating an EVS Disk
API Version Query
Querying Information of API Versions
Querying Information of an API Version
API v2
EVS Disk
Creating EVS Disks
Querying Details About All Disks
Deleting an EVS Disk (Deprecated)
Updating an EVS Disk (Deprecated)
Querying Details About a Disk
Querying EVS Disks (Deprecated)
Expanding Capacity of an EVS Disk (Deprecated)
EVS Tag
Obtaining All Tags of an EVS Resource Type
Batch Adding Tags for the Specified EVS Disk
Batch Deleting Tags for the Specified EVS Disk
Querying Tags of an EVS Disk
Querying Details of EVS Disks by Tag
OpenStack Cinder API v2
EVS Disk
Creating EVS Disks
Deleting an EVS Disk
Updating an EVS Disk
Querying EVS Disks
Querying Details About All Disks
Querying Details About a Disk
Querying EVS Disk Types
Querying Details About an EVS Disk Type
Querying Details of Tenant Quotas
Adding the Metadata for an EVS Disk
Querying Metadata of an EVS Disk
Updating the Metadata of an EVS Disk
Querying One Piece of Metadata for an EVS Disk
Updating One Piece of Metadata for an EVS Disk
Deleting One Piece of Metadata for an EVS Disk
Querying Extension APIs
Querying All AZs
EVS Disk Actions
Expanding Capacity of an EVS Disk
Setting Bootable Flag for an EVS Disk
Setting Read-Only Flag for an EVS Disk
Exporting EVS Disk Data as an Image
Attaching an EVS Disk (Deprecated)
Detaching an EVS Disk (Deprecated)
Reserving an EVS Disk (Deprecated)
Canceling Reservation of an EVS Disk (Deprecated)
EVS Snapshot
Creating an EVS Snapshot
Deleting an EVS Snapshot
Updating an EVS Snapshot
Querying EVS Snapshots
Querying Details About EVS Snapshots
Querying Details About an EVS Snapshot
Adding Metadata of an EVS Snapshot
Querying Metadata of an EVS Snapshot
Updating One Piece of Metadata for an EVS Snapshot
Updating the Metadata of an EVS Snapshot
Querying One Piece of Metadata for an EVS Snapshot
Deleting One Piece of Metadata for an EVS Snapshot
EVS Disk Transfer
Creating a Disk Transfer
Accepting a Disk Transfer
Deleting a Disk Transfer
Querying Details of a Disk Transfer
Querying All Disk Transfers
Querying Details of All Disk Transfers
Out-of-Date APIs
API v1
Querying Task Status
OpenStack Cinder API v1 (Deprecated)
EVS Disk
Querying Details About a Disk (Deprecated)
Permissions Policies and Supported Actions
Introduction
API Version Query
Disk
Disk Action
Snapshot
Tag
Disk Transfer
Appendix
Error Codes
Status Codes
EVS Disk Status
EVS Snapshot Status
API Actions
Obtaining a Project ID
Obtaining an Account ID
Change History
SDK Reference
SDK Overview
FAQs
Summary
General
How Do I Start Using a Newly Purchased Disk?
Can EVS Disks Be Used Directly for Storage?
Can EVS Disks Be Used Alone?
How Can I View My Disk Details?
How Do I Change the Name of My Disk?
Can I Change the AZ of My Disk?
Can I Change the Disk Type, Device Type, or Sharing Attribute of My Disk?
What Should I Do If an Error Occurs on My EVS Disk?
How Can I Obtain ECS NIC Information?
Why Do Some of My EVS Disks Not Have WWN Information?
How Can I Migrate Data from an EVS Disk?
What Are the Differences Between System Disks and Data Disks?
Will I Lose My Disk Data If I Reinstall ECS OS, Change the OS, or Change the ECS Specifications?
How Can I Export the Original Data After I Changed My Server OS from Windows to CentOS?
What Are the Differences Between MBR and GPT Partition Styles?
What Does the "reserveVolume" Trace Mean in CTS?
How Can I Download My EVS Disk Data to a Local PC?
How Can I Upload Files to My EVS Disk?
Billing
How Can I Stop Being Billed for My Disk?
Will I Be Billed If I Have Purchased an EVS Disk But Not Used It?
Can I Recover My Disk Data If the Disk Is Unsubscribed from, Deleted by Mistake, or Released After the Retention Period Ends?
Will My EVS Disk Be Deleted When I Delete Its Server?
Attachment
Why Can't I View the Attached Data Disk on the Server?
Why Can't I Attach My Disk to a Server?
Can I Attach a Disk to Multiple Servers?
Can I Attach a Disk to a Server in a Different AZ?
How Can I Add a Data Disk to an Existing Server?
Can I Attach Different Types of Disks to the Same Server?
Can I Switch Between System Disks and Data Disks?
What Should I Do If a Linux EVS Disk Is Attached to a Windows Server?
Can I Change the Function of a System Disk or Data Disk Purchased Along with a Server?
How Do I Obtain My Disk Device Name in the ECS OS Using the Device Identifier Provided on the Console?
Capacity Expansion
Can I Reduce or Temporarily Expand the Disk Capacity?
What Are the Differences Between Expanding Capacity by Expanding an EVS Disk and Creating a New EVS Disk?
Will My Disk Data Be Lost After I Expand the Disk Capacity?
Can I Use Backups or Snapshots Created Before Capacity Expansion to Restore Data on Expanded Disks?
Do I Need to Restart the Server After Expanding the Disk Capacity?
Do I Need to Detach an EVS Disk Before Expanding Its Capacity?
What Should I Do If My Disk Capacity Exceeds 2 TiB After Expansion?
How Can I Allocate Newly Added Space to a New Partition?
How Can I Allocate Newly Added Space to an Existing Partition?
Why Did My Disk Capacity Remain Unchanged on the Server After Capacity Expansion?
Why Can't I Expand Capacity for My Disk?
How Do I Extend the File System of an Unpartitioned Data Disk in Linux?
How Do I Extend the Root Partition of a Quickly Provisioned BMS?
How Do I View the Disk Partition Style in Linux?
Detachment
If I Detach a Disk, Will I Lose the Data on My Disk?
Why Can't I Detach My Disk?
Deletion
How Can I Recover Data from a Disk That Was Accidentally Deleted?
Why Can't I Delete My Disk?
Capacity
What Is the Maximum Capacity Supported for the System and Data Disks?
What Should I Do If My Disk Starts to Run Out of Space?
How Do I Clean Up My Disk Space on a Windows Server?
What Can I Do If the Capacity of My Disk Reaches the Maximum But I Still Need More Space?
What Should I Do If I Use fdisk to Initialize a Disk Larger Than 2 TiB and Then the Space in Excess of 2 TiB Cannot Be Displayed?
How Can I View My Disk Usage?
How Can I Monitor My Disk Usages?
Can I Transfer the Data Disk Capacity to a System Disk?
Why the Space of My New Disk Is Full After I Uploaded Only 500 MB of Files to the Disk?
Snapshot
What Are the Typical Causes of a Snapshot Creation Failure?
Does EVS Support Automatic Snapshot Creation?
Can I Create Snapshots for Multiple Disks at a Time?
How Is a Snapshot Created for My Disk?
Why Can't I Roll Back My Disk Data from a Snapshot?
Can I Roll Back Data from a Snapshot After Reinstalling the OS or Formatting the Disk?
How Is the Snapshot Size Calculated?
Do Snapshots Take Space on the Disk?
Can I Perform Multiple Rollback Operations for a Snapshot?
Can I Replicate Snapshots to Other Regions or Accounts?
Why Can't I Find My Snapshot?
Can I Use a Snapshot to Create a Disk and Roll Back Disk Data at Almost the Same Time?
Can I Modify Data in My EVS Snapshot?
Performance
How Do I Test My Disk Performance?
Why Does My Disk Performance Test Using Fio Have Incorrect Results?
How Can I Handle a Slowdown in Disk Read/Write Speed or Increased I/Os?
How Can I Improve My Disk Performance?
Why My Disk's Read IOPS Can't Reach the Theoretical Maximum IOPS When the Disk I/O Usage Is Almost 100%?
Sharing
Do I Have to Deploy a Cluster to Use Shared Disks?
How Many Servers Can I Attach a Shared Disk to?
How Can I Attach a Shared Disk to Multiple Servers?
Can a Shared Disk Be Attached to Servers That Belong to Different Accounts?
Can I Attach a Shared Disk to Servers Running Different OSs?
Backup
Do I Need to Stop the Server Before Performing a Disk Backup?
Can I Back Up and Restore My EVS Disk to a Different Region?
How Do I Check the Backup Data of My Disk?