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Data efficiency features within the PowerStore system are directly part of the read and write code path. All blocks written to the drives within the system can be shared among all resources within the appliance. Therefore, all resources including their snapshots and thin clones support the thin, deduplication, and compression efficiency features of PowerStore. Other features that transfer data into the system, such as import, replication, and migration, support the data efficiency features of the system. These features are passed through the same code path as a host write into the system.
When data is transferred out of the PowerStore system, it must first be returned to its full size. For instance, when a host or client requests data, the data must first be re-created within DRAM memory before it can be passed to this host. This rule is true for replication because data is passing to a remote cluster and for internal migrations when a resource is being moved from one appliance to another within the cluster. For replication and migration, when the data reaches its destination, it is subject to the data efficiency algorithms of that appliance.