Help Center> Distributed Cache Service> Data Migration Guide> Migration Tools and Schemes

Updated on 2023-07-27 GMT+08:00

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Migration Tools and Schemes

Migration Tools

**Table 1** Comparing Redis migration tools
Tool/Command/Service	Feature	Description
DCS console	Supports online migration (in full or incrementally) and backup migration (by importing backup files) with intuitive operations.	Backup migration is suitable when the source and target Redis instances are not connected, and the source Redis instance does not support the SYNC and PSYNC commands. To migrate data, import your backup files to OBS, and DCS will read data from OBS and migrate the data to the target DCS Redis instance. Online migration is suitable when the source Redis instance supports the SYNC and PSYNC commands. Data in the source Redis instance can be migrated in full or incrementally to the target instance.
redis-cli	The Redis command line interface (CLI), which can be used to export data as an RDB file or import the AOF file (that is, all DBs) of an instance. An AOF file is large file containing a full set of data change commands.	-
Rump	Supports online migration between DBs of an instance or between DBs of different instances.	Rump does not support incremental migration. Stop services before migrating data. Otherwise, keys might be lost. For details, see Online Migration with Rump.
redis-shake	An open-source tool that supports both online and offline migration.	redis-shake is suitable for migrating Redis Cluster data.
Self-developed migration script	Flexible and can be adjusted as required.	-

Migration Schemes

Self-hosted Redis refers to self-hosted Redis on Huawei Cloud, in another cloud, or in on-premises data centers.

**Table 2** Migration schemes
Scenario	Tool	Use Case	Description
From self-hosted Redis to DCS	DCS console	If the network between your self-hosted Redis instance and the DCS Redis instance is connected, follow to the instructions in Online Migration of Self-Hosted Redis. If the network between your self-hosted Redis instance and the DCS Redis instance is not connected, follow to the instructions in Backup Migration of Self-Hosted Redis.	-
	redis-cli	Self-Hosted Redis Migration with redis-cli (AOF)	-
	redis-cli	Self-Hosted Redis Migration with redis-cli (RDB)	-
	redis-shake	Self-Hosted Redis Cluster Migration with redis-shake	-
Between DCS instances	DCS console	Migrate data from an earlier-version DCS Redis instance to a later-version DCS Redis instance, for example, from a DCS Redis 3.0 instance to a DCS Redis 4.0 or 5.0 instance. If the network between the source and target DCS Redis instances is connected, follow to the instructions in Online Migration Between DCS Redis Instances. If the network between the source and target DCS Redis instances is not connected, follow to the instructions in Backup Migration Between Regions or Redis Versions.	Attempts to migrate data from a later-version Redis instance to an earlier-version Redis instance are not recommended because they will fail due to data compatibility issues between different Redis versions.
		Migrate Redis data between regions. For details, see Backup Migration Between Regions or Redis Versions.	The SYNC and PSYNC commands are disabled by default for DCS Redis instances. These commands are enabled for online migration within a region, and remain disabled for online migration between regions. Therefore, you can only use backup migration when migrating DCS Redis instance data between regions.
		Migrate Redis data from one account to another. For details, see Backup Migration Between Regions or Redis Versions. If the DCS Redis instances of the two accounts are connected, you can also follow the instructions in Online Migration Between DCS Redis Instances.	-
From another cloud to DCS	DCS console	If the SYNC and PSYNC commands are not disabled for the Redis service provided by another cloud, follow the instructions in Online Migration from Another Cloud. If the SYNC and PSYNC commands are disabled for the Redis service provided by another cloud, follow the instructions in Backup Migration from Another Cloud.	If online migration is required, contact the O&M personnel of another cloud to enable the SYNC and PSYNC commands.
	Rump	Online Migration with Rump	-
	redis-shake	Offline Migration of Redis Cluster from Another Cloud with redis-shake	-
	redis-shake	Online Full Migration of Redis from Another Cloud with redis-shake	-
From DCS to self-hosted Redis	DCS console	Migrating Data from DCS to Self-Hosted Redis	You can migrate data online from a DCS Redis instance to your self-hosted Redis by using the DCS console.

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