Patent application number | Description | Published |
20110082997 | VIRTUALIZED STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - There are provided a storage system and a method of operating thereof. The method comprises: a) representing to a plurality of hosts an available logical address space divided into one or more logical groups (e.g. logical volumes, virtual partitions, snapshots, combinations of a given logical volume and its respective snapshot(s), etc.), and b) mapping between one or more contiguous ranges of addresses related to the logical address space and one or more contiguous ranges of addresses related to the physical address space, wherein said mapping is provided with the help of one or more mapping trees, each tree assigned to a separate logical group in the logical address space. Mapping between contiguous ranges of addresses related to the logical address space and contiguous ranges of addresses related to the physical address space can be a) mapping between LBA and DBA addresses; b) mapping between VUA and VDA addresses; c) mapping between LBA and VDA addresses; and d) mapping between VUA and DBA addresses, wherein virtual unit addresses (VUA) characterize a first virtual layer operable to represent the logical address space, and virtual disk addresses (VDA) characterize a second virtual layer operable to represent the physical storage space. | 04-07-2011 |
20110202722 | Mass Storage System and Method of Operating Thereof - There are provided a storage system and a method of operating thereof. The method comprises: caching in the cache memory a plurality of data portions matching a certain criterion, thereby giving rise to the cached data portions; analyzing the succession of logical addresses characterizing the cached data portions; if the cached data portions cannot constitute a group of N contiguous data portions, where N is the number of RG members, generating a virtual stripe being a concatenation of N data portions wherein at least one data portion among said data portions is non-contiguous with respect to any other portion in the virtual stripe, and wherein the size of the virtual stripe is equal to the size of the stripe of the RAID group; destaging the virtual stripe and writing it to a respective storage device in a write-out-of-place manner. The virtual stripe can be generated responsive to receiving a write request from a client and/or responsive to receiving a write instruction from a background process. | 08-18-2011 |
20110202723 | Method of allocating raid group members in a mass storage system - There are provides an allocation module and a method of allocating a logical disk to a next member of a given RAID group. The method comprises: identifying one or more physical disks comprising at least one logical disk with already allocated member of said given RAID group, thus giving rise to allocated physical disks; identifying one or more pairs constituted by at least one allocated physical disk with non-allocated physical disks, said pairs having minimal number of RAID groups with members allocated to both physical disks in the pair, thus giving rise to a first group of pairs with minimal contention value; and selecting among the first group of pairs with minimal contention value one or more non-allocated physical disks as candidate physical disks for allocating said next member MEM | 08-18-2011 |
20120011314 | STORAGE SYSTEM WITH REDUCED ENERGY CONSUMPTION AND METHOD OF OPERATING THEREOF - There are provided a storage system with reduced energy consumption and a method of operating thereof. The method comprises caching in the cache memory a plurality of data portions corresponding to one or more incoming write requests, to yield cached data portions; consolidating the cached data portions characterized by a given level of expected I/O activity addressed thereto into a consolidated write request; and, responsive to a destage event, enabling writing the consolidated write request to one or more disk drives dedicated to accommodate data portions characterized by said given level of expected I/O activity addressed thereto. The cached data portions consolidated into the consolidated write request can be characterized by expected low frequency of I/O activity, and the respective one or more dedicated disk drives can be configured to operate in low-powered state unless activated. | 01-12-2012 |
20120066450 | VIRTUALIZED STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - A storage system and method is provided including physical storage devices controlled by storage control devices constituting a storage control layer operatively coupled to the physical storage devices and hosts. The storage control layer includes: a first virtual layer interfacing with the hosts, operable to represent a logical address space characterized by logical block addresses and available to said hosts and characterized by an Internal Virtual Address Space (IVAS) and operable, responsive to a configuration or I/O request addressed to the logical block addresses, to translate said logical block addresses into IVAS addresses; and a second virtual layer interfacing with the physical storage devices, operable to represent an available physical space to said hosts and characterized by a Physical Virtual Address Space (PVAS), addresses in PVAS having corresponding address in IVAS. The second virtual layer is operable to translate said respective IVAS addresses into addresses in the physical address space. | 03-15-2012 |
20120066469 | VIRTUALIZED STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - A storage system and method are provided including physical storage devices controlled by storage control devices constituting a storage control layer operatively coupled to the physical storage devices and hosts. The storage control layer includes: a first virtual layer interfacing with the hosts, operable to represent a logical address space characterized by logical block addresses, characterized by an Internal Virtual Address Space (IVAS) and operable, responsive to I/O requests addressed to logical block addresses, to provide protocol-dependent translation of said logical block addresses into IVAS addresses; and a second virtual layer interfacing with the physical storage space, and operable to represent available physical space to said hosts and characterized by a Physical Virtual Address Space (PVAS). Each address in PVAS having a corresponding address in IVAS. The second virtual layer is operable to translate PVAS addresses corresponding to IVAS addresses into addresses in physical address space in a protocol-independent manner. | 03-15-2012 |
20120072694 | VIRTUALIZED STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - A storage system and method is provided including physical storage devices controlled by storage control devices constituting a storage control layer operatively coupled to the physical storage devices and hosts. The storage control layer includes a first virtual layer interfacing with the hosts, operable to represent a logical address space available to said hosts and characterized by an Internal Virtual Address Space (IVAS); a second virtual layer characterized by a Physical Virtual Address Space (PVAS), interfacing with the physical storage devices, and operable to represent an available storage space; and an allocation module operatively coupled to the first and second virtual layers and providing mapping between IVAP and PVAS. Each address in PVAS is configured to have a corresponding address in IVAS. The allocation module facilitates management of IVAS and PVAS, enabling separation of a process of deleting certain logical object into processes performing changes in IVAS and PVAS, respectively. | 03-22-2012 |
20120079207 | MASS STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - There is provided a mass storage system and a method of operating thereof. The method comprises: a) generating one or more consistency checkpoints; b) associating each generated consistency checkpoint with a global number of snapshots generated in the storage system corresponding to time of generation of respective checkpoint; c) upon generating, placing each consistency checkpoint at the beginning of a sequence of dirty data portions which are handled in a cache memory with the help of a replacement technique with an access-based promotion; d) enabling within the sequence of dirty data portions an invariable order of consistency checkpoints and dirty data portions corresponding to volumes with generated snapshots; and e) responsive to destaging a certain consistency checkpoint, recording associated with the certain checkpoint global number of generated snapshots to a predefined storage location configured to be read during a recovery of the storage system. The invariable order can be provided by ceasing access-related promotion of all dirty data portions corresponding to all volumes with generated snapshots. | 03-29-2012 |
20120117322 | MASS DATA STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - There are provided a mass storage system comprising a control layer operatively coupled to a physical storage space and operable to interface with one or more clients and to present to said clients a plurality of logical volumes. The method of operating the storage system comprises: dividing one or more logical volumes into a plurality of statistical segments with predefined size; assigning to each given statistical segment a corresponding activity level characterizing statistics of I/O activity with regard to data portions within the given statistical segment, said statistics collected over a plurality of cycles of fixed counting length; and managing one or more data storage processes in the storage system (e.g. a background defragmentation process, a background garbage collection process, a destage management process, etc.) using said activity level. | 05-10-2012 |
20120191667 | SYSTEM AND METHOD OF STORAGE OPTIMIZATION - A method and system are disclosed for storage optimization. Data parts and metadata within a source data unit are identified and the data parts are compared with data which is already stored in the physical storage space. In case identical data parts are found within the physical storage, the data parts from the source data unit are linked to the identified data, while the data parts can be discarded, thereby reducing the required storage capacity. The metadata parts can be separately stored in a designated storage area. | 07-26-2012 |
20130198446 | STORAGE SYSTEM FOR ATOMIC WRITE OF ONE OR MORE COMMANDS - Storage systems which allow atomic write operations, methods of operating thereof, and corresponding computer program products. By way of non-limiting example, a possible method includes: receiving indication of a transaction, where a plurality of blocks directed to at least one destination logical volume and relating to at least one command is to be written as an atomic write operation; generating a transaction identifier number for the transaction; enabling tracking of the transaction at least partly based on the transaction identifier number, including temporary location of any one of the plurality of blocks; accommodating at least one block of the plurality temporarily in the storage system; and upon receiving an indication that all blocks in the plurality have been successfully temporarily accommodated in the storage system, enabling data corresponding to the plurality of blocks to subsequently be stored in the at least destination logical volume and discontinuing tracking of the transaction. | 08-01-2013 |
20130198447 | STORAGE SYSTEM FOR ATOMIC WRITE WHICH INCLUDES A PRE-CACHE - Storage systems which allow atomic write operations, methods of operating thereof, and corresponding computer program products. By way of non-limiting example, a possible method includes: configuring volatile memory into cache memory and pre-cache memory; receiving an indication that a plurality of blocks relating to a command is to be written as an atomic write operation; enabling tracking of the atomic write operation; caching at least one block from the plurality in the pre-cache memory; and upon receiving an indication that all blocks in the plurality have been successfully accommodated in the pre-cache memory, enabling data corresponding to the plurality of blocks to subsequently be cached in the cache memory and discontinuing tracking of the atomic write operation. | 08-01-2013 |
20130268730 | Grid Storage System and Method of Operating Thereof - A method of operating a storage system includes: configuring the address space so that each LBA is assigned to at least two servers among a plurality of at least three servers in a control grid: to a primary server with a primary responsibility for handling requests corresponding to said LBA, and to a secondary server with a secondary responsibility for handling requests corresponding to said LBA. In response to a request corresponding to a certain LBA range, generating by a data server having primary responsibility over the certain LBA range, a primary cache object; identifying a data server configured as a secondary data server with regard to the certain LBA range; and generating a redundancy cache object corresponding to the primary cache object only at the identified secondary data server, the redundancy cache object to be used by the identified secondary data server when taking the primary responsibility. | 10-10-2013 |
Patent application number | Description | Published |
20100146206 | GRID STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - The is provided a storage system comprising a plurality of disk units adapted to store data at respective ranges of logical block addresses (LBAs), said addresses constituting an entire address space, and a storage control grid operatively connected to the plurality of disk units and comprising a plurality of data servers. The method of operating the storage system comprises: a) configuring a first data server to have a primary responsibility over a certain range of LBAs, b) configuring a second data server to have a secondary responsibility over said certain range of LBAs and to overtake the primary responsibility over said certain range of LBAs if the first server fails; c) responsive to a request to one or more LBAs within said certain range of LBAs, generating a primary cache object in the first data server and generating a redundancy object in the second data server; d) deleting said redundancy object upon successful permanent storing of data and/or metadata corresponding to said request, said storing provided by the first data server, e) if operation d) fails, using said redundancy object by the second server for providing permanent storing said data and/or metadata when overtaking primary responsibility, wherein said redundancy object is derivation of the primary cache object and need to be reconstructed in order to enable overtaking the responsibility. | 06-10-2010 |
20100146328 | GRID STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - There is provided a storage system comprising a plurality of disk units adapted to store data at respective ranges of logical block addresses (LBAs), said addresses constituting an entire address space, and a storage control grid operatively connected to the plurality of disk units and comprising a plurality of data servers, each server comprising operatively coupled cache memory and non-volatile memory. The method of operating the storage system comprises: a) configuring a first server among said plurality of data servers to have a primary responsibility for handling requests directed to a certain range of LBAs; b) continuously obtaining by the first server, information indicative of configuration and/or changes thereof related to said certain data range, thus giving rise to configuration metadata; c) saving said configuration metadata and/or derivatives thereof at one or more disk units among said plurality of disk units in accordance with a predefined criterion; d) continuously saving in cache memory of the first server said configuration metadata obtained between said savings at disk units, thus giving rise to recent configuration changes metadata; e) destaging the recent configuration changes metadata to non-volatile memory of the first server if the first server fails. | 06-10-2010 |
20100153638 | GRID STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - There is provided a storage system and method of operating thereof. The storage system comprises a plurality of disk units adapted to store data at respective ranges of logical block addresses (LBAs), said addresses constituting an entire address space divided between a plurality of virtual partitions (VP), and a storage control grid operatively connected to the plurality of disk units and comprising a plurality of data servers, each server having direct or indirect access to the entire address space. Each certain virtual partition is configured to be controlled by at least two data servers among said plurality of data servers, a primary data server configured to have a primary responsibility for handling requests directed to any range of LBAs corresponding to said certain virtual partition and a secondary data server configured to have a secondary responsibility for handling requests directed to any range of LBAs corresponding to said certain virtual partition and to overtake the primary responsibility for handling respective requests if the primary server fails. Respectively, each data server is configured to have primary responsibility over all LBAs corresponding to at least two virtual partitions and to have secondary responsibility over all LBAs corresponding to at least two other virtual partitions. | 06-17-2010 |
20100153639 | GRID STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - The is provided a method of hot backward compatible upgrade of a storage system comprising a plurality of disk units adapted to store data at respective ranges of logical block addresses (LBAs), said addresses constituting an entire address space divided between a plurality of virtual partitions (VPs), and a storage control grid operatively connected to the plurality of disk units and comprising a plurality of at least three data servers, each server having direct or indirect access to the entire address space. The method comprises: a) configuring each certain virtual partition to be controlled by at least two data servers, a primary data server configured to have a primary responsibility for handling requests directed to any range of LBAs corresponding to said certain virtual partition and a secondary data server configured to have a secondary responsibility for handling requests directed to any range of LBAs corresponding to said certain virtual partition and to overtake the primary responsibility for handling respective requests if the primary server fails; b) respectively configuring each data server among the plurality of data servers to have primary responsibility over all LBAs corresponding to at least two virtual partitions and to have secondary responsibility over all LBAs corresponding to at least two other virtual partitions; c) responsive to a shut-down of a data server for an upgrade purpose, i) re-configuring primary responsibility over each VP previously primary controlled by the shut-down server such that it becomes primary controlled by a server previously configured as a secondary server with respect to this VP; ii) re-allocating secondary responsibility over each VP previously secondary controlled by the shut-down server in a manner that each such VP becomes secondary controlled by a server other than the newly assigned server with primary responsibility. | 06-17-2010 |
20120011312 | STORAGE SYSTEM WITH REDUCED ENERGY CONSUMPTION - A control layer of a data storage system is configured to identify one or more physical data units in the physical storage, which are associated only with corresponding logical snapshot data units, and to reallocate such physical snapshot data units to a dedicated storage space. The dedicated storage space can be a low-power storage space, which includes one or more disks designated as low power disks. The reallocation of snapshot data units to low power disks can be carried out according to an energy-aware migration policy, directed for minimizing the activation of the low power disks, and maintaining the disks in an inactive state for longer periods of time. | 01-12-2012 |
20120259810 | METHOD OF MIGRATING STORED DATA AND SYSTEM THEREOF - A method of migrating data from a source storage resource to a destination storage resource involves selecting a source volume in the source storage resource; configuring in the destination storage resource a destination volume corresponding to the source volume and having the same properties; and redirecting I/O requests from an application running on a host to the destination volume instead of the source volume, whilst migrating data stored in the source volume to the destination volume. A storage system is operable as a destination storage system for migrating data from a source storage system, including means for configuring a destination volume corresponding to a source volume in the source storage system and a migration module having a non-transitory computer useable medium and operable to initiate read requests addressed to the source volume thereby enabling a background process of migrating data stored in the source volume to the destination volume. | 10-11-2012 |
20130067269 | OBJECT BASED STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - A method and a storage system for managing logical objects, wherein the storage system includes a plurality of control servers and the method includes: (i) defining a plurality of object pools and associating each logical object, hosted in the storage system, with one of the plurality of object pools; (ii) configuring each control server to have a primary responsibility over at least two of the object pools, such that each object pool is controlled by one primary control server, configured to handle requests directed to logical objects associated with the object pool; and (iii) in response to a failure of one of the plurality of control servers, configuring each operational server of the plurality of control servers to take over primary responsibility for at least one object pool, originally defined under the primary responsibility of the failed control server. | 03-14-2013 |
20130238855 | MANAGEMENT OF CACHE MEMORY IN A STORAGE SYSTEM - According to the teaching disclosed herein there is provided at least a method, system and device for managing a cache memory of a storage system. The storage system is associated with at least one physical storage device and, responsive to a read request, comprising information indicative of a logical address of at least one requested data unit, to obtain a storage physical address associated with the logical address, search the cache memory for a data unit associated with the storage physical address and service the request from the cache in case the data unit to is found in the cache memory. | 09-12-2013 |
20130269039 | DATA ACCESS CONTROL - The presently disclosed subject matter includes a system and method for protecting data stored in a physical storage space of a storage system. According to the teachings disclosed herein, a block key is provided together with a read and a write request and is applied on data, which is related to a logical data block, for calculating a data block signature. A read request according to the presently disclosed subject matter includes, in addition to data indicative of a requested data block, a block key for the purpose of verifying the data block signature that was stored upon the last write of the requested data block. A write request according to the presently disclosed subject matter includes, in addition to data indicative of a data block to be written, a block key for generating a respective data block signature. | 10-10-2013 |
20130326272 | STORAGE SYSTEM AND METHOD OF OPERATING THEREOF - Storage system(s) for storing data in physical storage in a recurring manner, method(s) of operating thereof, and corresponding computer program product(s). For example, a possible method can include: upon start of a storage recurrence, destaging dirty data which had been accommodated in the cache memory prior to the start of said storage recurrence thus giving rise to destaged data group, wherein destaging is provided with no overwriting of at least superseded data destaged before starting said storage recurrence whilst enabling retaining metadata indicative of location of said superseded data in the physical storage space; accommodating data obtained in said cache memory subsequent to the start of said storage recurrence whilst preventing said data from being destaged during said storage recurrence, thus giving rise to accommodated data group; and registering a point-in-time indicative of successful destaging of the destaged data group, thereby providing an order-preservation consistency indication corresponding to said recurrence. | 12-05-2013 |
20130332700 | Cloud Storage Arrangement and Method of Operating Thereof - There is provided a storage arrangement and a method of operating thereof. The storage arrangement comprises a first storage system and one or more second storage systems operatively coupled to the first storage system. First control layer is operable to handle a first logical address space comprising a first logical group characterized by a plurality of logical block addresses; first control layer comprises a first mapping module handling a first mapping structure associated with first logical group. Each second control layer comprises, respectively, a second mapping module handling a second mapping structure associated with first logical group. The first mapping structure is configured to provide mapping between logical addresses related to first logical group and corresponding addresses related to first physical address spaces, and/or to point to respective second mapping structure configured to provide mapping between these logical addresses and corresponding addresses related to respective second physical address spaces. | 12-12-2013 |
20130339569 | Storage System and Method for Operating Thereof - Storage system(s) for providing storing data in physical storage in a recurring manner, method(s) of operating thereof, and corresponding computer program product(s). For example, a possible method can include for each recurrence: generating a snapshot of at least one logical volume; destaging all data corresponding to the snapshot which was accommodated in the cache memory prior to a time of generating the snapshot and which was dirty at the time of generating said snapshot, thus giving rise to destaged data group; and after the destaged data group has been successfully destaged, registering an indication that the snapshot is associated with an order preservation consistency condition for the at least one logical volume, thus giving rise to a consistency snapshot. | 12-19-2013 |
20140040212 | STORAGE CONTROL GRID AND METHOD OF OPERATING THEREOF - There is provided a storage control grid capable of controlling at least one service provided in the storage system and a method of operating thereof. The storage control grid comprises at least one service dispatcher operatively coupled to at least one service requestor and to a plurality of service providers. The method comprises requesting by service requester a service, thus giving rise to at least one service request; enabling, using said at least one service dispatcher, delivery of the service request to at least one service provider among said plurality of service providers, said service provider configured to provide said at least one service, wherein the delivery is enabled in accordance with data comprised in a service data structure handled by said at least one service dispatcher and indicative, at least, of association between said at least one service and service providers among said plurality of service providers. | 02-06-2014 |
20140089580 | HANDLING ENCLOSURE UNAVAILABILITY IN A STORAGE SYSTEM - The presently disclosed subject matter includes, inter alia, a storage system and a method of managing allocation of data in case an enclosure in a storage system becomes unavailable. The storage system has a storage space configured as a plurality of RAID groups, each RAID group comprising N parity members. According to one aspect of the disclosed subject matter, responsive to a write request, at least one section allocated to a disk in an unavailable enclosure is identified; at least one temporary RAID group in a spare storage space of the storage system is allocated and data related to the write request is written to the alternative RAID group. | 03-27-2014 |
20140149664 | Storage System Capable of Managing a Plurality of Snapshot Families and Method of Operating Thereof - There is provided a storage system comprising a control layer operable to manage a plurality of snapshot families, each family constituted by snapshot family members having hierarchical relations therebetween. The method of operating the storage system comprises searching a cache memory for an addressed data block corresponding to an addressed LBA and associated with an addressed snapshot family and an addressed SF member. In a case of missing the addressed data block in the cache memory, identifying in the cache memory all dirty data blocks corresponding to the addressed LBA and associated with the addressed snapshot family (candidate data blocks); identifying among SF members of the addressed snapshot family a destage owner, and in a case when the identified destage owner is associated with a candidate data block, reading from the cache memory such candidate data block. | 05-29-2014 |
20140149665 | Storage System Capable of Managing a Plurality of Snapshot Families and Method of Operating Thereof - There is provided a storage system comprising a control layer operable to manage a snapshot family (SF) constituted by SF members having hierarchical relations represented by a SF relationship data structure and a method of operating thereof. Upon receiving a command for restoring a writable SF member from a read-only snapshot thereof, the control layer provides a foreground atomic operation. The atomic operation comprises generating a new writable snapshot of the read-only snapshot (a destination SF member), modifying the SF relationship data structure, and re-assigning all logical unit numbers (LUNs) from the writable SF member to be restored to the destination SF member. Upon successful completion of the atomic operation, the control layer sends acknowledgement indicative of successful restoring the writable SF member. The control layer further provides a background process comprising modifying, in correspondence with the provided atomic operation, a SF mapping data structure comprising mappings between logical and physical addresses corresponding to SF members. | 05-29-2014 |
20140149670 | Storage System and Method of Operating Thereof - There is provided a storage system capable to maintain a snapshot family comprising a plurality of members having hierarchical relations therebetween, and a method of operating thereof. The method comprises generating a mapping data structure with mapping entries each comprising mappings for mapping a logical address range associated with the mapping entry into physical address ranges respectively correlated to representative members of the snapshot family; omitting mappings corresponding to omitted member(s) different from any of the one or more representative members sharing a respective range of physical addresses; responsive to an access request directed to a certain logical address range and a certain omitted member, determining, using a predefined rule related to the hierarchical and sequential relations between members of the snapshot family, a representative member from the one or more representative members; and responding to the access request by using a physical address range correlated to the representative member. | 05-29-2014 |
20140149698 | Storage System Capable of Managing a Plurality of Snapshot Families and Method of Operating Thereof - There is provided a storage system and a method of identifying delta-data therein between two points-in-time. The method comprises: generating successive snapshots S | 05-29-2014 |
20140172801 | SYSTEM, METHOD AND COMPUTER READABLE MEDIUM FOR EFFIEICNT SNAPSHOT-BASED MIRRORING OPERATIONS - A storage system that may include a management module, a communication module and a storage module; wherein the management module is arranged to receive, at an intermediate point in time that occurs between the first point in time and a second point in time, a first request that indicates that a certain extent of the second logical volume is irrelevant; participate in a creation of second point in time snapshots of the first and second logical volumes; select, in response to the first request, out of all data deltas generated between the first and second point in time, selected data deltas to be transmitted to the other storage system; wherein the selected data deltas exclude data deltas associated with the certain extent that were generated between the first point in time and the intermediate point in time. | 06-19-2014 |
20140244935 | STORAGE SYSTEM CAPABLE OF MANAGING A PLURALITY OF SNAPSHOT FAMILIES AND METHOD OF SNAPSHOT FAMILY BASED READ - A method for a snapshot family based reading of data units from a storage system, the method comprises: receiving a read request for reading a requested data entity, searching in a cache memory of the storage system for a matching cached data entity, if not finding the matching cached data entity then: searching for one or more relevant data entity candidates stored in the storage system; selecting, out of the one or more relevant data entity candidates, a selected relevant data entity that has a content that has a highest probability, out of contents of the one or more relevant data entity candidates, to be equal to the content of the requested data entity; and responding to the read request by sending the selected relevant data entity. | 08-28-2014 |
20140372394 | SYSTEM, METHOD AND A NON-TRANSITORY COMPUTER READABLE MEDIUM FOR TRANSACTION AWARE SNAPSHOT - A method for generating transaction aware snapshots, the method may include: (a) starting a creation of a certain point in time snapshot for a consistency group that comprises at least one logical volume; (b) detecting that at the certain point in time there is an uncompleted transaction for writing multiple information units to the consistency group; the uncompleted transaction started at a transaction start point in time that precedes the certain point in time; (c) preventing an access to the certain point in time snapshot until a completion of the uncompleted transaction; and (d) associating the multiple information units with at least the certain point in time snapshot. | 12-18-2014 |
20140372693 | SYSTEM, METHOD AND A NON-TRANSITORY COMPUTER READABLE MEDIUM FOR READ THROTLING - A method for managing read requests, the method may include receiving from a requesting entity a read request for reading an information unit stored in a storage system; determining by a control entity of the storage system whether the information unit is cached in a cache memory of the storage system and whether at least a predetermined number of disk drives of the storage system are currently overloaded; introducing a delay to a response to the read request thereby increasing a time difference between a time of the receiving of the read request and a time of a provision of the information unit to the requesting entity, if it is determined that the information unit is not cached in the cache memory and that the at least predetermined number of disk drives of the storage system are currently overloaded; and providing the information unit to the requesting entity. | 12-18-2014 |