摘要:
A method, system and program for generating parity in a data storage system are provided. The invention comprises organizing an incoming data block into a specified number of data stripes and cascading the data stripes into a parity creation mechanism. The parity creation mechanism creates a specified number of parity stripes based on the data stripes, wherein the number of parity stripes is independent of the size of the data block. The parity creation mechanism can operate offline to reconstruct lost data stripes and parity stripes without using critical system resources, wherein the number of devices required for stripe reconstruction is less than the combined number of data stripes and parity stripes.
摘要:
A method, system and program for generating parity in a data storage system are provided. The invention comprises organizing an incoming data block into a specified number of data stripes and cascading the data stripes into a parity creation mechanism. The parity creation mechanism creates a specified number of parity stripes based on the data stripes, wherein the number of parity stripes is independent of the size of the data block. The parity creation mechanism can operate offline to reconstruct lost data stripes and parity stripes without using critical system resources, wherein the number of devices required for stripe reconstruction is less than the combined number of data stripes and parity stripes.
摘要:
A method and apparatus to handle multiple sets of removable media within a storage system. A first set of removable media are mounted on a set of drives. Data is accepted until the first set of removable media is filled. A second set of removable media is mounted on the drives, while the first set of removable media is removed. When the change in removable media is complete, writing of data proceeds on the second set of removable media. Data may be buffered while the change in removable media occurs. Alternatively, two sets of removable media may be mounted at the same time. When the first set of removable media is filled to a selected amount, the second set of removable media may then be used to write the data. A third set of removable media is set up or mounted for use, while the first set of removable media is removed.
摘要:
Security is provided for a data set stored in a data storage canister. The data set has a data size when received for storage within the canister. At least one data security operation is performed on the received data set to generate secure data having a secure data size that may be different than the set data size. The secure data is stored on at least one data storage device within the canister. Any information about the secure data size is kept from the data producer sending the data set for storage.
摘要:
A method and apparatus for managing power sequencing in a data storage system. The turn-on or spin-up sequence for the media drives in an array of media drives is selectively controlled such that the overall rush current is reduced. The individual drive components are characterized to determine a power profile for each such component. A closed-loop process is then used to manage and reduce peak power requirements when starting up or spinning up an array of media drives using the drive profiles. The media drives can also be organized as a plurality of sets of drives, and a power profile for each set of drives is used to manage and reduce peak power requirements.
摘要:
A system and method of storing data using write once read many (WORM) protection including using a hardware storage device to write data to a medium are provided. The method further includes establishing a write once read many (WORM) module external to the hardware storage device. Data blocks are received at the module, block numbers are specified with the module, and data is output from the module to write to the storage medium at specified block numbers. The last specified block number or all specified block numbers depending on the type of media access are stored so that the external WORM module prevents future writing of data to these specified or already used block numbers.
摘要:
Data integrity checking methods utilize a cumulative hash function. A sequence of data blocks and a corresponding sequence of hashes are stored on a medium. Each hash in the sequence of hashes corresponds to a data block in the sequence of data blocks. A particular hash corresponding to a particular data block is determined as a function of the particular data block and at least one previous hash corresponding to a previous data block in the sequence of data blocks.
摘要:
In a storage area network (SAN) including a storage device accessible by a remote client, a method is provided. The SAN is configured to allow input/output (I/O) data transport over the SAN between the remote client and the storage device. The method includes establishing a write once read many (WORM) server in the SAN between the storage device and the remote client. Data is received at the WORM server from the remote client. The method further includes appending a digitally signed timestamp to the data, specifying a plurality of locations, and sending the data and the timestamp to the storage device. The data is sent as a series of data over the SAN such that the series of data is written to the storage device at the specified plurality of locations. Future writing of data to the specified plurality of locations is prevented.