Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A hardware frame modifier apparatus where the functions of the virtual device and virtual host are combined so that a single processor may perform them is provided. The hardware frame modifier apparatus may virtualize command and status frames without a store and forward operation. The modified command and status frames are sent to the physical host and physical device. The hardware frame modifier apparatus used a virtual table, updated by the virtual device/virtual host, to determine the appropriate mapping of the logical storage device of the frames to a physical storage device. Based on this mapping, the hardware frame modifier changes the frame header to direct the frame directly to the physical storage device and to determine the appropriate conversion of command and status type. In this way, the number of store and forward operations required to send data frames to, or read from, the physical storage devices is reduced or eliminated, thus reducing the delay or latency.

Abstract: A data processing system, method, and product are disclosed for managing a virtual storage system. A first command is received from a host to store data utilizing a storage scheme. At least one second command is generated to write data according to the storage scheme to ones of the storage devices in response to the receipt of the first command. The at least one second command is then transmitted to the ones of the plurality of storage devices. Data is stored in the ones of the storage devices according to the storage scheme in response to a receipt of the second command by a storage device.