Migration Solution Notes

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 from Another Cloud Using 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

**Table 2** Migration Schemes
Scenario	Tool	Use Case	Description
Migration between Huawei Cloud DCS instances	DCS console	To migrate instances in a region and of an account, see Online Migration Between Instances. To migrate instances in different regions or accounts, see Backup Import Between DCS Redis Instances.	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.
From self-hosted Redis to DCS NOTE: Self-hosted Redis refers to self-hosted Redis on Huawei Cloud, in another cloud, or in on-premises data centers.	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 Between Instances. If the network between your self-hosted Redis instance and the DCS Redis instance is not connected, follow to the instructions in Self-Hosted Redis Migration with Backup Files.	-
	redis-cli	Self-Hosted Redis Migration with redis-cli (AOF) Self-Hosted Redis Migration with redis-cli (RDB)	-
	redis-shake	Self-Hosted Redis Cluster Migration with redis-shake (Online) Self-Hosted Redis Cluster Migration with redis-shake (RDB)	-
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 Migrating Redis from Another Cloud Online. If the SYNC and PSYNC commands are disabled for the Redis service provided by another cloud, follow the instructions in Backup Import 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 from Another Cloud Using Rump	-
	Redis-shake	Backup Import from Another Cloud Using redis-shake Migrating from Another Cloud Online Using redis-shake	-