Abstract: A method for power management of a storage system unit, the method may include selecting a power reduction measure out of (a) a shutdown of at least one stateless compute node out of stateless compute nodes of the storage system unit, and (b) an other power reduction measure that does not involve the shutdown of the at least one stateless compute node, while prioritizing the shutdown of the at least one stateless compute node over the other power reduction measure; wherein the storage system unit further comprises storage nodes; wherein states related to communications with client computers (i) are maintained in the storage nodes, and (ii) are not stored on the stateless compute nodes; and applying the power reduction measure based on the selecting.

Abstract: A system and method for erasure coding. The method includes distributing a plurality of data chunks according to a mirroring scheme, wherein the plurality of data chunks is distributed as a plurality of rows among a plurality of non-volatile memory (NVM) nodes, wherein the mirroring scheme defines a plurality of groups, each group including a subset of the plurality of data chunks, wherein each data chunk in a group has a role corresponding to a relative position of the data chunk within the group, wherein data chunks included in the plurality of groups having the same relative positions within their respective groups have the same role, wherein each row of the plurality of rows includes at least one summation data chunk that is a function of at least one data chunk included in the row and of at least one extra data chunk included in at least one other row.

Abstract: A system and method for transaction management. The system includes a processing circuitry; and a memory, the memory containing instructions that, when executed by the processing circuitry, configure the system to: assign a transaction identifier (ID) to a transaction, wherein the transaction includes at least one modification to at least one object stored in a storage system, each object having a persistent state, wherein the transaction ID indicates a state of the transaction, wherein the state of the transaction initially indicates that the transaction is in progress; modify the at least one object, wherein the modifying further comprises adding at least one conditional entry to each object, wherein each conditional entry includes one of the at least one modification that is conditional on the state of the transaction; and update the transaction ID when a termination event occurs, wherein the updating further includes changing the state of the transaction.

Abstract: A system and method for erasure coding. The method includes distributing a plurality of data chunks according to a mirroring scheme, wherein the plurality of data chunks is distributed as a plurality of rows among a plurality of non-volatile memory (NVM) nodes, wherein the mirroring scheme defines a plurality of groups, each group including a subset of the plurality of data chunks, wherein each data chunk in a group has a role corresponding to a relative position of the data chunk within the group, wherein data chunks included in the plurality of groups having the same relative positions within their respective groups have the same role, wherein each row of the plurality of rows includes at least one summation data chunk that is a function of at least one data chunk included in the row and of at least one extra data chunk included in at least one other row.

Abstract: A system and method for transaction management. The system includes a processing circuitry; and a memory, the memory containing instructions that, when executed by the processing circuitry, configure the system to: assign a transaction identifier (ID) to a transaction, wherein the transaction includes at least one modification to at least one object stored in a storage system, each object having a persistent state, wherein the transaction ID indicates a state of the transaction, wherein the state of the transaction initially indicates that the transaction is in progress; modify the at least one object, wherein the modifying further comprises adding at least one conditional entry to each object, wherein each conditional entry includes one of the at least one modification that is conditional on the state of the transaction; and update the transaction ID when a termination event occurs, wherein the updating further includes changing the state of the transaction.

Abstract: A system and method for global data compression. The method includes splitting a dataset into a plurality of blocks; for each block of the plurality of blocks: computing at least one similarity hash for the block; determining, based on the at least one similarity hash, whether a similar block is found for the block, wherein a similar block for a block has a similarity hash that is similar to one of the computed at least one similarity hash for the block; compressing the block by replacing data of the block with a reference to the similar block and a delta when a similar block is found, wherein the delta is a difference in data between the block and the similar block; and compressing the block independently when a similar block is not found.

Abstract: According to an aspect of the presently disclosed subject matter, there is provided a system for managing data in a storage system, the system including a storage layer which provides storage resource, and a snapshot layer that includes: a volume-version data structure, a chunk-version data structure and a IO handler.

Abstract: A method for re-establishing a backup relationship between first and second volumes associated with one or more storage media in a data storage system is provided. The method comprises storing first information for preserving the backup relationship, in response to or in advance of receiving a request to terminate the backup relationship; recording changes to the first or second volumes that occur subsequent to terminating the backup relationship; and re-establishing the backup relationship between the first and second volumes according to the first information such that the first and second volumes are synchronized by merging the recorded changes with the first or second volumes.

Abstract: A storage system, including: (a) a primary storage entity utilized for storing a data-set of the storage system; (b) a secondary storage entity utilized for backing-up the data within the primary storage entity; (c) a flushing management module adapted to identify within the primary storage entity two groups of dirty data blocks, each group is comprised of dirty data blocks which are arranged within the secondary storage entity in a successive sequence, and to further identify within the primary storage entity a further group of backed-up data blocks which are arranged within the secondary storage entity in a successive sequence intermediately in-between the two identified groups of dirty data blocks; and (d) said flushing management module is adapted to combine the group of backed-up data blocks together with the two identified groups of dirty data blocks to form a successive extended flush sequence and to destage it to the secondary storage entity.

Abstract: According to an aspect of the presently disclosed subject matter, there is provided a system for managing data in a storage system, the system including a storage layer which provides storage resource, and a snapshot layer that includes: a volume-version data structure, a chunk-version data structure and a IO handler.

Abstract: A method for consistent version of multiple information items is provided. The method includes receiving a conditional request to copy a version of multiple information items at a condition fulfillment point of time that is associated with a fulfillment of a condition of the conditional request. Then determining that the condition is fulfilled, and participating in generating a condition fulfillment point in time version of the multiple information items.

Abstract: A computer-implemented method for efficient data storage is provided. A first storage medium associates data stored on one or more data storage media with a unique identification value (ID) for the purpose of determining de-duplication status of the data. In response to receiving a request to read the data from a logical address, the first storage medium retrieves the data from a second storage medium based on the unique ID. In response to receiving a request to write the data to a logical address, the one or more data storage media store at least one copy of the data based on the de-duplication status of the data.

Abstract: According to an aspect of the presently disclosed subject matter, there is provided a system for managing data in a storage system, the system including a storage layer which provides storage resource, and a snapshot layer that includes: a volume-version data structure, a chunk-version data structure and a IO handler.

Abstract: A method, comprising: during a normal operating mode of a first solid-state storage device, reserving a portion of an available physical storage space of the first solid-state storage device, giving rise to a reserved portion and a user data portion; setting a user data capacity of the first solid-state storage device according to a size of the user data portion; using substantially the entire available physical storage space for storing user data within the first solid-state storage device; and upon receiving at the first solid-state storage device an instruction to switch to a data protection mode, switching the first solid-state storage device to the data protection mode and allocating part of the reserved portion to the user data portion, giving rise to an extended user data portion, and using the added user data capacity for backing up data that is or was stored on the second solid-state storage device.

Abstract: A method for managing data, the method includes: providing a write-back cache unit coupled to at least one storage unit; receiving a request to write a new data version to a certain cache data allocation unit; determining, in response to a data storage policy, whether to overwrite a cached data version being cached in the certain cache data allocation unit or to perform a destage of the cached data version to a first storage unit before writing the new data version to the certain cache allocation unit; receiving a request to read a data version that corresponds to a certain point in time and scanning a first data structure representative of write operations and a second data structure representative of revert operations to determine a location of the requested data version.

Abstract: A method for re-establishing a backup relationship between first and second volumes associated with one or more storage media in a data storage system is provided. The method comprises storing first information for preserving the backup relationship, in response to or in advance of receiving a request to terminate the backup relationship; recording changes to the first or second volumes that occur subsequent to terminating the backup relationship; and re-establishing the backup relationship between the first and second volumes according to the first information such that the first and second volumes are synchronized by merging the recorded changes with the first or second volumes.

Abstract: A computer-implemented method for efficient data storage is provided. A first storage medium associates data stored on one or more data storage media with a unique identification value (ID) for the purpose of determining de-duplication status of the data. In response to receiving a request to read the data from a logical address, the first storage medium retrieves the data from a second storage medium based on the unique ID. In response to receiving a request to write the data to a logical address, the one or more data storage media store at least one copy of the data based on the de-duplication status of the data.

Abstract: A method for re-establishing a backup relationship between first and second volumes associated with one or more storage media in a data storage system is provided. The method comprises storing first information for preserving the backup relationship, in response to or in advance of receiving a request to terminate the backup relationship; recording changes to the first or second volumes that occur subsequent to terminating the backup relationship; and re-establishing the backup relationship between the first and second volumes according to the first information such that the first and second volumes are synchronized by merging the recorded changes with the first or second volumes.

Abstract: A method for synchronizing data storage systems is provided. The method comprises designating a relationship between a first data storage system and a second data storage system, such that data stored in the first data storage system is copied to the second data storage system, in response to determining that the data stored in the first data storage system has been modified; receiving a first request to modify data stored in a first data block of a first storage volume in the first data storage system, wherein the data block is modified according to the first request; determining that the first data block has not been successfully synchronized when the modified data stored in the first data block is not copied to the second data storage system; and executing a process to retry synchronization of the first data block until synchronization of the first data block is successful, without suspending the relationship while the process is executed.

Abstract: A computer-implemented method for efficient data storage is provided. A first storage medium associates data stored on one or more data storage media with a unique identification value (ID) for the purpose of determining de-duplication status of the data. In response to receiving a request to read the data from a logical address, the first storage medium retrieves the data from a second storage medium based on the unique ID. In response to receiving a request to write the data to a logical address, the one or more data storage media store at least one copy of the data based on the de-duplication status of the data.