Oracle International Corporation

Atiq Ahamad

Jon Mark Holdman

Aditya Sawhney

Carl T Madison, Jr

Robert Michael Raymond

John Richard Kostraba, Jr

Techniques are described for migrating data between storage components. In one or more embodiments, a storage system receives a request to migrate data from a first storage component to a second storage component. Responsive to the request, the storage system initiates migration of the data from the first storage component to the second storage component. While migration is ongoing, the storage system may receive a request to access the data. Responsive to receiving a write request, the storage system executes the write request on the second storage component without executing the write request on the first storage component. Responsive to determining that the second request is a read request, the storage system selects one of the first storage component or the second storage component to execute the read request based on a first attribute associated with the first storage component and/or a second attribute associated with the second storage component.

Data layout schemas for seamless data migration

A data deduplication method using a small hash digest dictionary in fast-access memory. The method includes receiving customer data, dividing the data into smaller chunks, and assigning hash values to each chunk. For each chunk, the method includes performing lookup for a duplicate chunk by accessing a small dictionary in memory with the chunk's hash value. When no entry, the small dictionary is updated to include the hash value to fill the dictionary with earliest received data. When an entry is found, the entry's hash value is compared with lookup value and if matched, reference data is returned and an entry counter is incremented. If not matched, additional accesses are attempted such as with additional indexes calculated using the hash value. Collisions may trigger an entry replacement such that some initially entered entries are replaced when determined to not be most repeating values such as based on their counter value.

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Superior, CO, United States of America

Atiq Ahamad