หน้านี้ยังไม่พร้อมใช้งานในภาษาท้องถิ่นของคุณ เรากำลังพยายามอย่างหนักเพื่อเพิ่มเวอร์ชันภาษาอื่น ๆ เพิ่มเติม ขอบคุณสำหรับการสนับสนุนเสมอมา
- What's New
- Function Overview
- Service Overview
- Getting Started
-
User Guide
- Permissions Management
- Purchasing and Using an EVS Disk
- Attaching an Existing EVS Disk
- Viewing EVS Disk Details
- Changing the EVS Disk Type (OBT)
- Expanding EVS Disk Capacity
- Detaching and Deleting an EVS Disk
- Managing EVS Recycle Bin
-
Managing EVS Snapshots
- EVS Snapshot Overview
-
Using EVS Snapshots
- Creating an EVS Snapshot
- Rolling Back Disk Data from a Snapshot
- Creating a Disk from a Snapshot
- Enabling or Disabling Instant Snapshot Restore (for Snapshots in Commercial Use)
- Checking the EVS Snapshot Storage Usage (for Snapshots in Commercial Use)
- Checking EVS Snapshot Details
- Deleting an EVS Snapshot
- Managing Encrypted EVS Disks
- Managing Shared EVS Disks
- Managing EVS Disk Backups
- Managing EVS Transfers
- Managing EVS Tags
- Managing EVS Quotas
- Cloud Eye Monitoring
- Recording EVS Operations Using CTS
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Getting Started
- API Version Query
-
API
-
Disk Management
- Creating EVS Disks
- Updating an EVS Disk
- Querying Details About All EVS Disks
- Querying Details About an EVS Disk
- Expanding Capacity of an EVS Disk
- Deleting an EVS Disk
- Creating EVS Disks (Deprecated)
- Querying EVS Disks (Deprecated)
- Expanding Capacity of an EVS Disk (Deprecated)
- Unsubscribing from Yearly/Monthly EVS Disks
- Querying Details About All EVS Disks (Deprecated)
- Querying Details About an EVS Disk (Deprecated)
- Modifying QoS of an EVS Disk
- Snapshot Management
- Tag Management
- Task Management
-
Disk Management
-
Cinder API
-
Disk Management
- Creating EVS Disks
- Deleting an EVS Disk
- Updating an EVS Disk
- Querying EVS Disk Types
- Querying Details About an EVS Disk Type
- Querying EVS Disks
- Querying Details About an EVS Disk
- Querying Details About All EVS Disks
- Querying Extension APIs
- 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)
- Snapshot Management
- Quota Management
- Disk Transfer Management
- Disk Metadata Management
- Snapshot Metadata Management
- API Version Query
- AZ Query
-
Disk Management
-
Out-of-Date APIs
- API
-
Cinder API
-
Disk Management
- Querying Details About an EVS Disk (Deprecated)
- Creating EVS Disks
- Querying Details About All EVS Disks
- Deleting an EVS Disk
- Updating an EVS Disk
- Querying EVS Disk Types
- Querying Details About an EVS Disk Type
- Querying EVS Disks
- Querying Details About an EVS Disk
- Querying Extension APIs
- Expanding Capacity of an EVS Disk
- Setting Bootable Flag for an EVS Disk
- Exporting EVS Disk Data as an Image
- Setting Read-Only Flag for an EVS Disk
- Snapshot Management
- Quota Management
- Disk Metadata Management
- Snapshot Metadata Management
- Querying AZs
-
Disk Management
- Permissions and Supported Actions
- Appendix
- Change History
- SDK Reference
-
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?
- How Can I Delete or Unsubscribe from a Yearly/Monthly Disk?
- 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 Unsubscribed or Deleted When I Unsubscribe from or Delete Its Server?
- Will I Be Billed for the Disks in the Recycle Bin?
-
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 a Yearly/Monthly Disk to Another 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 Attach an EVS Disk Purchased with a Yearly/Monthly Server to Another Yearly/Monthly 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?
- How Can I View Data on My Disk If Its Yearly/Monthly Server Has Expired?
-
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
- Deletion
-
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?
-
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
- Backup
- Videos
- Glossary
-
More Documents
-
User Guide
- Overview
-
Getting Started
- Basic Operation Procedure
- Create an EVS Disk
- Attach an EVS Disk
-
Initialize an EVS Data Disk
- Introduction to Data Disk Initialization Scenarios and Partition Styles
- Initializing a Windows Data Disk (Windows Server 2008)
- Initializing a Windows Data Disk (Windows Server 2019)
- Initializing a Linux Data Disk (fdisk)
- Initializing a Linux Data Disk (parted)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2008)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2012)
- Initializing a Linux Data Disk Larger Than 2 TiB (parted)
- Permissions Management
- Disk Capacity Expansion
- Detaching an EVS Disk
- Deleting EVS Disks
- Managing Shared EVS Disks
- Managing EVS Backups
- Managing EVS Snapshots
- Managing EVS Transfers
- Managing a Tag
- Viewing EVS Monitoring Data
- Auditing
-
FAQ
-
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?
- Can I Change the AZ of My Disk?
- What Are the Differences Between System Disks and Data Disks?
- How Can I Download My EVS Disk Data to a Local PC?
- 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?
-
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?
- 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?
- Why Did My Disk Capacity Remain Unchanged on the Server After Capacity Expansion?
- How Do I Extend the File System of an Unpartitioned Data Disk in Linux?
-
Attachment
- Why Can't I View the Attached Data Disk on the Server?
- Can I Attach a Disk to Multiple Servers?
- Can I Attach a Disk to a Server in Another AZ?
- How Can I Add a Data Disk to an Existing Server?
- Can I Attach Different Types of Disks to the Same Server?
- What Should I Do If a Linux EVS Disk Is Attached to a Windows Server?
- Detachment
- Capacity
- Sharing
-
General
- Appendix
- Change History
-
API Reference (ME-Abu Dhabi Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
- API Version Query
- API v2
-
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 Metadata of an EVS Disk
- Querying Metadata of an EVS Disk
- Updating 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 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
-
EVS Disk
- Out-of-Date APIs
- Appendix
- Change History
-
User Guide (Paris Region)
- Overview
-
Getting Started
- Process Overview
- Create an EVS Disk
- Attach an EVS Disk
-
Initialize an EVS Data Disk
- Introduction to Data Disk Initialization Scenarios and Partition Styles
- Initializing a Windows Data Disk (Windows Server 2008)
- Initializing a Windows Data Disk (Windows Server 2019)
- Initializing a Linux Data Disk (fdisk)
- Initializing a Linux Data Disk (parted)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2008)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2012)
- Initializing a Linux Data Disk Larger Than 2 TiB (parted)
- Permissions Management
- Creating and Using an EVS Disk
- Disk Capacity Expansion
- Detaching an EVS Disk
- Attaching an Existing Disk
- Deleting EVS Disks
- Viewing EVS Disk Details
- Managing Encrypted EVS Disks
- Managing Shared EVS Disks
- Managing EVS Backups
- Managing a Tag
- Changing EVS Disk Name
- Viewing EVS Monitoring Data
- Viewing EVS Monitoring Data (Agent Installed and Simplified Monitoring Metrics Used)
- Auditing
- Managing Quotas
-
FAQ
- Summary
-
General
- How Do I Start Using a Newly Created Disk?
- Can EVS Disks Be Used Directly for Storage?
- Can EVS Disks Be Used Alone?
- How Can I View My Disk Details?
- 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 Download My EVS Disk Data to a Local PC?
- 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 Upload Files to My EVS Disk?
- Billing
-
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 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?
-
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 Another AZ?
- How Can I Add a Data Disk to an Existing Server?
- Can I Attach Different Types of Disks to the Same Server?
- 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 Created Along with a Server?
- How Do I Obtain My Disk Device Name in the ECS OS Using the Device Identifier Provided on the Console?
- Detachment
- Deletion
-
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?
- 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?
-
Performance
- How Can 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 and Increased I/O?
- 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
- Backup
- Appendix
- Change History
-
API Reference (Paris Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
APIs
- Disk Management
-
Tag Management
- Batch Deleting Tags of a Specified EVS Disk
- Batch Adding Tags for the Specified EVS Disk
- Obtaining All Tags of an EVS Resource Type
- Querying Tags of an EVS Disk
- Querying Details of EVS Disks by Tag
- Deleting the Tag of an EVS Resource by Key
- Querying the Number of EVS Disks by Tag
- Adding or Updating Tags for an EVS Resource (Deprecated)
- Batch Deleting Tags for an EVS Resource (Deprecated)
- Obtaining Tags of a Specified EVS Resource (Deprecated)
- Querying Tags of an EVS Resource by Key (Deprecated)
- Resetting Tags of an EVS Resource (Deprecated)
- Updating Tags of an EVS Resource by Key (Deprecated)
- Querying EVS Resources by Tag (Deprecated)
- Task Management
- EVS Replication Pair (Deprecated)
-
Replication Consistency Group (Deprecated)
- Creating a Replication Consistency Group (Deprecated)
- Deleting a Replication Consistency Group (Deprecated)
- Querying All Replication Consistency Groups (Deprecated)
- Querying Details About a Replication Consistency Group (Deprecated)
- Updating a Replication Consistency Group (Deprecated)
- Performing a Failover for a Replication Consistency Group (Deprecated)
- Synchronizing a Replication Consistency Group (Deprecated)
- Performing a Primary/Secondary Switchover for a Replication Consistency Group (Deprecated)
- Pausing a Replication Consistency Group (Deprecated)
- Reprotecting a Replication Consistency Group (Deprecated)
- Expanding EVS Disks in a Replication Consistency Group (Deprecated)
- EVS Replication Quota (Deprecated)
-
OpenStack Cinder APIs
-
Disk Management
- Creating EVS Disks
- Deleting an EVS Disk
- Updating an EVS Disk
- Querying EVS Disk Types
- Querying EVS Disks
- Querying Details About All Disks
- Querying Details About a Disk
- Querying Details About an EVS Disk Type
- Querying Extension APIs
- 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)
- Quota Management
- AZ Query
- Disk Metadata Management
- API Version Query
-
Disk Management
-
Out-of-Date APIs
-
OpenStack Cinder API
-
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 Metadata of an EVS Disk
- Querying Metadata of an EVS Disk
- Updating 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
- Querying Summary Information of EVS Disks
- Querying Details About a Disk (Deprecated)
- EVS Disk Actions
-
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 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
-
EVS Disk
-
OpenStack Cinder API
- Appendix
- Change History
-
User Guide (Kuala Lumpur Region)
- Overview
-
Getting Started
- Process Overview
- Create an EVS Disk
- Attach an EVS Disk
-
Initialize an EVS Data Disk
- Introduction to Data Disk Initialization Scenarios and Partition Styles
- Initializing a Windows Data Disk (Windows Server 2008)
- Initializing a Windows Data Disk (Windows Server 2019)
- Initializing a Linux Data Disk (fdisk)
- Initializing a Linux Data Disk (parted)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2008)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2012)
- Initializing a Linux Data Disk Larger Than 2 TiB (parted)
- Permissions Management
- Creating and Using an EVS Disk
- Disk Capacity Expansion
- Detaching an EVS Disk
- Attaching an Existing Disk
- Deleting EVS Disks
- Viewing EVS Disk Details
- Managing Encrypted EVS Disks
- Managing Shared EVS Disks
- Managing EVS Backups
- Managing EVS Snapshots
- Managing EVS Transfers
- Managing a Tag
- Changing EVS Disk Name
- Viewing EVS Monitoring Data
- Viewing EVS Monitoring Data (Agent Installed and Simplified Monitoring Metrics Used)
- Auditing
- Managing Quotas
-
FAQ
- Summary
-
General
- How Do I Start Using a Newly Created Disk?
- Can EVS Disks Be Used Directly for Storage?
- Can EVS Disks Be Used Alone?
- How Can I View My Disk Details?
- 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?
- How Can I Download My EVS Disk Data to a Local PC?
- 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 Upload Files to My EVS Disk?
-
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?
-
Attachment
- Why Can't I View the Attached Data Disk on the Server?
- Why Can't I Attach My Disk to a ?
- Can I Attach a Disk to Multiple Servers?
- Can I Attach a Disk to a Server in Another AZ?
- How Can I Add a Data Disk to an Existing Server?
- Can I Attach Different Types of Disks to the Same Server?
- 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 Created Along with a Server?
- How Do I Obtain My Disk Device Name in the ECS OS Using the Device Identifier Provided on the Console?
- Detachment
- Deletion
-
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?
- 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?
- Performance
- Sharing
-
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 the 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 the Snapshot at Almost the Same Time?
- Backup
- Appendix
- Change History
-
API Reference (Kuala Lumpur Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
- API Version Query
- APIs
-
OpenStack Cinder APIs
-
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
-
EVS Disk
- Out-of-Date APIs
- Permissions Policies and Supported Actions
- Appendix
- Change History
-
User Guide (Ankara Region)
- Overview
-
Getting Started
- Process Overview
- Create an EVS Disk
- Attach an EVS Disk
-
Initialize an EVS Data Disk
- Introduction to Data Disk Initialization Scenarios and Partition Styles
- Initializing a Windows Data Disk (Windows Server 2008)
- Initializing a Windows Data Disk (Windows Server 2019)
- Initializing a Linux Data Disk (fdisk)
- Initializing a Linux Data Disk (parted)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2008)
- Initializing a Windows Data Disk Larger Than 2 TiB (Windows Server 2012)
- Initializing a Linux Data Disk Larger Than 2 TiB (parted)
- Disk Capacity Expansion
- Detaching an EVS Disk
- Deleting EVS Disks
- Permissions Management
- Managing Shared EVS Disks
- Managing EVS Backups
- Managing EVS Snapshots
- Managing EVS Transfers
- Viewing EVS Monitoring Data
- Managing Quotas
-
FAQ
-
General
- How Do I Start Using a Newly Disk?
- Can EVS Disks Be Used Directly for Storage?
- Can EVS Disks Be Used Alone?
- How Can I View My Disk Details?
- Can I Change the AZ of My Disk?
- What Are the Differences Between System Disks and Data Disks?
- How Can I Download My EVS Disk Data to a Local PC?
- 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?
-
Attachment
- Why Can't I View the Attached Data Disk on the Server?
- Can I Attach a Disk to Multiple Servers?
- Can I Attach a Disk to a Server in Another AZ?
- How Can I Add a Data Disk to an Existing Server?
- Can I Attach Different Types of Disks to the Same Server?
- What Should I Do If a Linux EVS Disk Is Attached to a Windows 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?
- 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?
- Why Did My Disk Capacity Remain Unchanged on the Server After Capacity Expansion?
- How Do I Extend the File System of an Unpartitioned Data Disk in Linux?
- How Do I View the Disk Partition Style in Linux?
- Detachment
-
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?
- 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?
- 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 the 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 the Snapshot at Almost the Same Time?
- Sharing
-
General
- Appendix
- Change History
-
API Reference (Ankara Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
- APIs
-
OpenStack Cinder APIs
-
Disk Management
- Creating EVS Disks
- Deleting an EVS Disk
- Updating an EVS Disk
- Querying EVS Disk Types
- Querying EVS Disks
- Querying Details About All Disks
- Querying Details About a Disk
- Querying Details About an EVS Disk Type
- Querying Extension APIs
- 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)
- Quota Management
- AZ Query
- Disk Transfer Management
- Disk Metadata Management
- API Version Query
-
Disk Management
-
Out-of-Date APIs
- API
-
OpenStack Cinder API
-
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 Metadata of an EVS Disk
- Querying Metadata of an EVS Disk
- Updating 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
- Querying Summary Information of EVS Disks
- Querying Details About a Disk (Deprecated)
- EVS Disk Actions
-
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 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
-
EVS Disk
- Appendix
- Change History
-
User Guide
- General Reference
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Shared EVS Disks and Usage Instructions
What Are Shared EVS Disks?
Shared EVS disks are block storage devices that support concurrent read/write operations and can be attached to multiple servers. Shared EVS disks feature multiple attachments, high-concurrency, high-performance, and high-reliability. They are usually used for enterprise business-critical applications that require cluster deployment for high availability (HA). Multiple servers can access the same shared EVS disk at the same time.
A shared EVS disk can be attached to a maximum of 16 servers. Servers that EVS supports include ECSs and BMSs. To share files, you need to deploy a shared file system or a cluster management system, such as Windows MSCS, Veritas VCS, or CFS.
You must set up a shared file system or cluster management system before using shared EVS disks. If you directly attach a disk to multiple servers, the sharing function will not work and data may be overwritten.
Usage Precautions
Because most cluster applications, such as Windows MSCS, Veritas VCS, and Veritas CFS, require SCSI reservations, you are advised to use shared EVS disks with SCSI. If a SCSI EVS disk is attached to a Xen ECS for use, you must install the driver. For details, see Device Types and Usage Instructions.
- Shared VBD EVS disks: The device type of a newly created shared EVS disk is VBD by default. Such disks can be used as virtual block storage devices, but do not support SCSI reservations. If SCSI reservations are required for your applications, create shared SCSI EVS disks.
- Shared SCSI EVS disks: These EVS disks support SCSI reservations.
NOTICE:
- To improve data security, you are advised to use SCSI reservations together with the anti-affinity policy of an ECS group. That said, ensure that shared SCSI EVS disks are only attached to ECSs in the same anti-affinity ECS group.
- If an ECS does not belong to any anti-affinity ECS group, you are advised not to attach shared SCSI EVS disks to this ECS. Otherwise, SCSI reservations may not work properly, which may put your data at risk.
Concepts of the anti-affinity ECS group and SCSI reservations:
- The anti-affinity policy of an ECS group allows ECSs to be created on different physical servers to improve service reliability.
For details about ECS groups, see Managing ECS Groups in the Elastic Cloud Server User Guide.
- The SCSI reservation mechanism uses a SCSI reservation command to perform SCSI reservation operations. If an ECS sends such a command to an EVS disk, the disk is displayed as locked to other ECSs, preventing the data damage that may be caused by simultaneous read/write operations to the disk from multiple ECSs.
- ECS groups and SCSI reservations have the following relationship: A SCSI reservation on a single EVS disk cannot differentiate multiple ECSs on the same physical host. For that reason, if multiple ECSs that use the same shared EVS disk are running on the same physical host, SCSI reservations will not work properly. Therefore, you are advised to use SCSI reservations only on ECSs that are in the same ECS group, thus having a working anti-affinity policy.
Advantages
- Multiple attachments: A shared EVS disk can be attached to a maximum of 16 servers.
- High-performance: The random read/write IOPS of a shared ultra-high I/O disk can reach up to 160,000.
- High-reliability: Shared EVS disks support both manual and automatic backup, delivering highly reliable data storage.
- Wide range of use: Shared EVS disks can be used for Linux RHCS clusters where only VBD EVS disks are needed. They can also be used for Windows MSCS and Veritas VCS clusters that require SCSI reservations.
Specifications and Performance
Shared EVS disks have the same specifications and performance as non-shared EVS disks. For details, see Disk Types and Performance.
Data Sharing Principle and Common Usage Mistakes
A shared EVS disk is essentially the disk that can be attached to multiple servers for use, which is similar to a physical disk in that the disk can be attached to multiple physical servers, and each server can read data from and write data into any space on the disk. If the data read/write rules, such as the read/write sequence and meaning, between these servers are not defined, data read/write interference between servers or other unpredictable errors may occur.
Though shared EVS disks are block storage devices that provide shared access for servers, shared EVS disks do not have the cluster management capability. Therefore, you need to deploy a cluster system to manage shared EVS disks. Common cluster management systems include Windows MSCS, Linux RHCS, Veritas VCS, and Veritas CFS.
- Data inconsistency caused by read/write conflicts
When a shared EVS disk is attached to two servers (server A and server B), server A cannot recognize the disk spaces allocated to server B, vice versa. That said, a disk space allocated to server A may be already used by server B. In this case, repeated disk space allocation occurs, which leads to data errors.
For example, a shared EVS disk has been formatted into the ext3 file system and attached to server A and server B. Server A has written metadata into the file system in space R and space G. Then server B has written metadata into space E and space G. In this case, the data written into space G by server A will be replaced. When the metadata in space G is read, an error will occur.
- Data inconsistency caused by data caching
When a shared EVS disk is attached to two servers (server A and server B), the application on server A has read the data in space R and space G, then cached the data. At that time, other processes and threads on server A would then read this data directly from the cache. At the same time, if the application on server B has modified the data in space R and space G, the application on server A cannot detect this data change and still reads this data from the cache. As a result, the user cannot view the modified data on server A.
For example, a shared EVS disk has been formatted into the ext3 file system and attached to server A and server B. Both servers have cached the metadata in the file system. Then server A has created a new file (file F) on the shared disk, but server B cannot detect this modification and still reads data from its cached data. As a result, the user cannot view file F on server B.
Before you attach a shared EVS disk to multiple servers, the disk device type needs to be determined. The device type can be either VBD or SCSI. Shared SCSI EVS disks support SCSI reservations. Before using SCSI reservations, you need to install a driver in the server OS and ensure that the OS image is included in the compatibility list.
If you simply attach a shared EVS disk to multiple servers, files cannot be shared between the servers as shared EVS disks do not have the cluster capability. Therefore, build a shared file system or deploy a cluster management system if you need to share files between servers.
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