- Release Notes
- Product Introduction
- Purchase Guide
- Getting Started
- Console Guide
- Console Overview
- Bucket Management
- Bucket Overview
- Creating Buckets
- Deleting Buckets
- Querying Buckets
- Empty Buckets
- Setting Access Permission
- Setting Bucket Encryption
- Setting Hotlink Protection
- Setting Origin-Pull
- Setting Cross-Origin Access
- Setting Versioning
- Setting up a Static Website
- Setting Lifecycle
- Setting Logging
- Accessing Bucket List Using Sub-Account
- Adding Bucket Policies
- Setting INTELLIGENT TIERING
- Enabling Inventory
- Domain Name Management
- Setting Bucket Tags
- Setting Cross-Bucket Replication
- Enabling Global Acceleration
- Object Management
- Uploading Objects
- Downloading Objects
- Copying Objects
- Viewing Object Information
- Searching for Objects
- Sorting and Filtering Objects
- Direct Upload Archiving
- Modifying Storage Class
- Deleting File Fragments
- Setting Object Access Permission
- Setting Object Encryption
- Custom Headers
- Deleting Objects
- Restoring an Archived Object
- Folder Management
- Data Extraction
- Set object Tag
- Batch Operation
- Monitoring Reports
- Data Processing
- User Tools
- Best Practice
- Overview
- Access Control and Permission Management
- ACL Practices
- Cloud Access Management Practices
- Granting Sub-accounts Access to COS
- Cases of Permission Setting
- Working with COS API Access Policies
- Temporary Key Security Guide for Frontend Direct Upload to COS
- Generating and Using Temporary Keys
- Grant Sub-account Permissions to Pull Tag List
- Granting Sub-account Under One Root Account Permission to Manipulate Buckets Under Another Root Account
- Performance Optimization
- Data Migration
- Accessing COS Using the AWS S3 SDK
- Data Disaster Recovery and Backup
- Direct Data Upload
- Domain Name Management Practice
- Data Security
- Data Verification
- Big Data Practice
- Using COS in the Third-party Applications
- Introduction to COS Data Security Solution
- Developer Guide
- Creating Request
- Bucket
- Object
- Data Management
- Data Disaster Recovery
- Data Security
- Cloud Access Management (CAM)
- Batch Processing
- Monitoring and Alarms
- Global Acceleration
- Data Processing
- API Documentation
- Introduction
- Common Request Headers
- Common Response Headers
- Error Codes
- Request Signature
- Operation List
- Service APIs
- Bucket APIs
- Basic Operations
- Access Control List (acl)
- Cross-Origin Resource Sharing (cors)
- Lifecycle (lifecycle)
- Bucket policy(policy)
- Hotlink protection（referer)
- Tag (tagging)
- Intelligent Tiering
- Static website(website)
- Bucket inventory(inventory)
- Versioning
- Cross-region Replication（replication）
- Log Management(logging)
- Bucket Encryption (encryption)
- Global Acceleration (Accelerate)
- Object APIs
- Batch Operation APIs
- Data Processing
- SDK Documentation
- SDK Overview
- Android SDK
- C SDK
- C++ SDK
- .NET SDK
- Go SDK
- iOS SDK
- Java SDK
- JavaScript SDK
- Node.js SDK
- PHP SDK
- Python SDK
- Mini Program SDK
- Error Codes
- FAQs
- Service Level Agreement
- Glossary
- Release Notes
- Product Introduction
- Purchase Guide
- Getting Started
- Console Guide
- Console Overview
- Bucket Management
- Bucket Overview
- Creating Buckets
- Deleting Buckets
- Querying Buckets
- Empty Buckets
- Setting Access Permission
- Setting Bucket Encryption
- Setting Hotlink Protection
- Setting Origin-Pull
- Setting Cross-Origin Access
- Setting Versioning
- Setting up a Static Website
- Setting Lifecycle
- Setting Logging
- Accessing Bucket List Using Sub-Account
- Adding Bucket Policies
- Setting INTELLIGENT TIERING
- Enabling Inventory
- Domain Name Management
- Setting Bucket Tags
- Setting Cross-Bucket Replication
- Enabling Global Acceleration
- Object Management
- Uploading Objects
- Downloading Objects
- Copying Objects
- Viewing Object Information
- Searching for Objects
- Sorting and Filtering Objects
- Direct Upload Archiving
- Modifying Storage Class
- Deleting File Fragments
- Setting Object Access Permission
- Setting Object Encryption
- Custom Headers
- Deleting Objects
- Restoring an Archived Object
- Folder Management
- Data Extraction
- Set object Tag
- Batch Operation
- Monitoring Reports
- Data Processing
- User Tools
- Best Practice
- Overview
- Access Control and Permission Management
- ACL Practices
- Cloud Access Management Practices
- Granting Sub-accounts Access to COS
- Cases of Permission Setting
- Working with COS API Access Policies
- Temporary Key Security Guide for Frontend Direct Upload to COS
- Generating and Using Temporary Keys
- Grant Sub-account Permissions to Pull Tag List
- Granting Sub-account Under One Root Account Permission to Manipulate Buckets Under Another Root Account
- Performance Optimization
- Data Migration
- Accessing COS Using the AWS S3 SDK
- Data Disaster Recovery and Backup
- Direct Data Upload
- Domain Name Management Practice
- Data Security
- Data Verification
- Big Data Practice
- Using COS in the Third-party Applications
- Introduction to COS Data Security Solution
- Developer Guide
- Creating Request
- Bucket
- Object
- Data Management
- Data Disaster Recovery
- Data Security
- Cloud Access Management (CAM)
- Batch Processing
- Monitoring and Alarms
- Global Acceleration
- Data Processing
- API Documentation
- Introduction
- Common Request Headers
- Common Response Headers
- Error Codes
- Request Signature
- Operation List
- Service APIs
- Bucket APIs
- Basic Operations
- Access Control List (acl)
- Cross-Origin Resource Sharing (cors)
- Lifecycle (lifecycle)
- Bucket policy(policy)
- Hotlink protection（referer)
- Tag (tagging)
- Intelligent Tiering
- Static website(website)
- Bucket inventory(inventory)
- Versioning
- Cross-region Replication（replication）
- Log Management(logging)
- Bucket Encryption (encryption)
- Global Acceleration (Accelerate)
- Object APIs
- Batch Operation APIs
- Data Processing
- SDK Documentation
- SDK Overview
- Android SDK
- C SDK
- C++ SDK
- .NET SDK
- Go SDK
- iOS SDK
- Java SDK
- JavaScript SDK
- Node.js SDK
- PHP SDK
- Python SDK
- Mini Program SDK
- Error Codes
- FAQs
- Service Level Agreement
- Glossary
Practice Scenario
If you have a local IDC, COS offers the following migration methods to help you quickly migrate massive amounts of local data to COS.
| Migration Method | Description |
|---|---|
| COS Migration(online migration) | COS Migration is an all-in-one tool integrating COS data migration features. You can migrate data to COS quickly after completing simple configurations. |
| Cloud Data Migration (CDM) (offline migration) | CDM uses a dedicated offline migration device provided by Tencent Cloud to help you migrate your local data to the cloud, solving the problems that arise from online migration from a local IDC to cloud, such as long time, high costs, and low security. |
You can determine how to migrate data based on the data volume, IDC egress bandwidth, IDC idle server resources, acceptable completion time, and other factors. The estimated time needed for online migration is shown in the figure below. As can be seen, if data migration needs to take more than 10 days or the amount of data to be migrated exceeds 50 TB, you are recommended to use CDM for offline migration; otherwise, online migration is a better choice.
Data migration may be affected if there is a high number of small files below 1 MB or the performance of disk IO is insufficient.
Migration Practice
COS Migration
The steps are as follows:
- Install the Java environment.
- Install the COS Migration tools.
- Modify the configuration file.
- Launch the tool.
For more information, please see COS Migration Tool.
Tips
Below describes how to configure COS Migration to maximize the migration speed:
- Adjust the threshold and concurrence of large/small files based on your network environment to implement optimal migration where large files are split into multiple parts and small files are transferred concurrently. Adjust the tool execution time and set a bandwidth limit to ensure that bandwidth usage by data migration will not affect your business operations. Such adjustments can be made by modifying the following parameters in the
[common]section of theconfig.iniconfiguration file:Parameter Name Parameter Description smallFileThreshold Threshold for small files. If the size of a file is higher than or equal to this threshold, multipart upload will be used; otherwise, simple upload will be used. The default value is 5 MB. bigFileExecutorNum Concurrence of large files, which is 8 by default.
If COS is connected to over the public network with low bandwidth, reduce this value.smallFileExecutorNum Concurrence of small files, which is 64 by default.
If COS is connected to over the public network with low bandwidth, reduce this value.executeTimeWindow This parameter defines the time range when the migration tool will execute a task every day, which will enter sleep mode at other times. In sleep mode, the migration will be paused and the migration progress will be retained until the next time window when the migration will be resumed automatically. - Distributed parallel transfer can further speed up the migration. You can install COS Migration on multiple servers and perform migration tasks separately for different data sources.
Cloud Data Migration (CDM)
The steps are as follows:
- Go to the CDM Console to submit an application.
- After the application is approved, you can wait to receive a device.
- After receiving the device, copy your data to it as instructed in the migration device user manual.
- Then, submit a return application in the console and wait for Tencent Cloud to migrate your data to COS.
For more information, please see Cloud Data Migration (CDM).
Tips
Below describes how to migrate data to COS offline efficiently and securely.
- Configure a 10 Gbps network connection for your IDC. To remove potential constraints of the local data environment on data transfer, you can use a high-performance server as a mount point to maximize the replication speed.
- Parallel transfer is the fastest way to transfer data though CDM. You can monitor the CPU and memory utilization of the device and if the current migration speed is lower than expected, you can speed the migration up in the following ways:
- Connect multiple devices to the same CDM device via different network interfaces.
- Connect multiple devices to several CDM devices via different network interfaces.
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