What Are the Differences Between CDM and Other Data Migration Services?

CDM

Cloud Data Migration (CDM) is an efficient and easy-to-use batch data integration service. Based on the big data migration to the cloud and intelligent data lake solution, CDM provides easy-to-use migration capabilities and capabilities of integrating multiple data sources to the data lake, reducing the complexity of data source migration and integration and effectively improving the data migration and integration efficiency. For details, see What Is CDM?.

CDM can migrate data from a database or object storage to a data lake or big data system.

Differences between CDM and DRS:

• If the destination is a big data system, CDM is recommended.
• If the destination is an OLTP database or DWS, DRS is recommended.

Differences between CDM and OMS:

• OMS is used to migrate data from the following clouds to HUAWEI CLOUD: Amazon Web Services (AWS), Alibaba Cloud, Microsoft Azure, Baidu Cloud, QingCloud, Qiniu Cloud, and Tencent Cloud.
• CDM is mainly used to migrate OBS data to a data lake or big data system for data development, cleaning, and governance. However, use OMS if you want to migrate an entire bucket.

OMS

OMS helps you migrate data from object storage on other clouds online to the OBS on HUAWEI CLOUD. For details, see Object Storage Migration Service.

OMS provides the following functions:

• Online data migration: It helps you easily and smoothly migrate object storage data from the public cloud of other cloud service providers to HUAWEI CLOUD.
• Cross-region replication: It enables you to replicate and back up data across regions of HUAWEI CLOUD.

Currently, OMS can migrate object storage data of the following clouds to HUAWEI CLOUD: Amazon Web Services (AWS), Alibaba Cloud, Microsoft Azure, Baidu Cloud, HUAWEI CLOUD, Kingsoft Cloud, QingCloud, Qiniu Cloud, and Tencent Cloud.

CDM can also migrate object storage data. However, CDM and OMS differ in the following way:

• OMS is used to migrate data from other clouds to HUAWEI CLOUD.
• CDM is mainly used to migrate OBS data to a data lake or big data system for data development, cleaning, and governance.

DRS

DRS is a stable, efficient, and easy-to-use cloud service for database online migration and synchronization in real time. DRS is used to migrate data from mainstream databases to other databases (including third-party databases), for example, from OLTP to OLTP or DWS. For details, see Data Replication Service.

Currently, the following database links are supported:

MySQL databases on HUAWEI CLOUD or other clouds to RDS for MySQL

PostgreSQL databases on HUAWEI CLOUD or other clouds to RDS for PostgreSQL

MongoDB databases on HUAWEI CLOUD or other clouds to DDS

Oracle->RDS for MySQL

......

Differences between DRS and CDM:

• DRS migrates data to a database, for example, a MySQL or a MongoDB database.
• CDM migrates data to a data lake or big data system, for example, MRS HDFS or FusionInsight HDFS.

Differences between DRS and UGO:

• DRS is used for full/incremental data migration or synchronization.
• UGO is used for the evaluation, structure migration, and syntax conversion before a heterogeneous database migration.

SMS

SMS is a P2V/V2V migration service that helps you migrate applications and data from on-premises x86 physical servers or VMs on private or public clouds to ECSs on HUAWEI CLOUD.

UGO

UGO is a professional cloud service that focuses on heterogeneous database structure migration. It automatically converts the syntax of the DDL in databases and the database SQL statements encapsulated in service programs into the SQL syntax of GaussDB or RDS on HUAWEI CLOUD. It uses pre-migration evaluation, structure migration, and automatic syntax conversion to identify possible reconstruction in advance, improve the conversion rate, and minimize the database migration cost. For details, see Database and Application Migration UGO.

In short, UGO is used for the evaluation, structure migration, and syntax conversion before a heterogeneous database migration.

DES

DES provides you with physical devices to make it easier to migrate terabytes, or even petabytes of data to HUAWEI CLOUD inexpensively and much faster than would be possible over a network connection. For details, see Data Express Service.

Differences Between Data Migration Services