摘要:
Techniques are provided for performing a copy operation. A fast reverse restore command indicating a new source and a new target is received, wherein the new source is an original target and the new target is an original source. A synchronous scan is performed on the new target. A new target structure associated with the new target is updated using a new source structure associated with the new source. Techniques are also provided for performing a copy operation in which a fast reverse restore command is received after an instant virtual copy has been performed from a new target to a new source and wherein the fast reverse restore command is performed before a background copy has been performed by the instant virtual copy.
摘要:
Provided is a technique for allocating resources. Reserved resources are allocated to one or more depth levels, wherein the reserved resources form one or more reserved pools. Upon receiving a request for allocation of resources, a depth level from which to allocate resources is determined. A reserved pool is allocated from the determined depth level.
摘要:
A two-phase process FlashCopy operation is provided that can be used to aid in the formation of consistency groups across multiple storage control units. In the first phase, preparations to create a new consistency group are made “revertible” by write-inhibiting the source volumes through “Establish-FlashCopy-revertible” commands. If the preparation of any volume within the consistency group fails, a “Withdraw-FlashCopy-revert” command may be executed, thereby causing a retention of the prior FlashCopy point-in-time copy. In the second phase, executed if all preparations are successful, a “Withdraw-FlashCopy-commit” command may be executed to remove all write-inhibit indicators, complete the creation of the new FlashCopy point-in-time copy and secure the new consistency group. Write requests to the FlashCopy source volumes may then be received and processed without risking corruption of the new consistency group on the Flashcopy target volumes.
摘要:
A computer-implemented method for reducing a computing overhead associated with objects that are local to a particular thread and can be accessed solely by that thread. Dynamically during run-time, an object is determined to be local to a particular thread and can be accessed solely by that thread, whereby a computing overhead associated with that object may be reduced. Likewise, cache locality may be optimized in respect of objects that are determined to be global so as to avoid putting them in the same cache line, whilst thread-local objects are preferably stored in a cache line associated with that thread.
摘要:
A method for performing remote calls between source and target computing machines includes running a program thread on the source machine which invokes a remote call to the target machine. The remote call is transmitted to the target machine, the call including an identifier associated with the program thread. A response to the remote call is received from the target machine, the response including the identifier, whereby the response is returned to the program thread on the source machine using the identifier.
摘要:
In accordance with one or more embodiments, an inode implemented file system may be utilized to support both offline and inline deduplication. When the first content is stored in the storage medium, one inode is used to associate a filename with the data blocks where the first content is stored. When a second content that is a duplicate of the first content is to be stored, then a parent inode is created to point to the data blocks in which a copy of the first content is stored. Further, two inodes are created, one representing the first content and the other representing the second content. Both inodes point to the same parent inode that points to the data blocks where the first content is stored.
摘要:
In accordance with one or more embodiments, an inode implemented file system may be utilized to support both offline and inline deduplication. When the first content is stored in the storage medium, one inode is used to associate a filename with the data blocks where the first content is stored. When a second content that is a duplicate of the first content is to be stored, then a parent inode is created to point to the data blocks in which a copy of the first content is stored. Further, two inodes are created, one representing the first content and the other representing the second content. Both inodes point to the same parent inode that points to the data blocks where the first content is stored.
摘要:
Generating a consistent point in time copy of data in a source volume and a target volume is achieved responsively to a first data modification request by writing a first altered version of the data onto a single source volume, asynchronously transferring the first altered version from the first storage site to a target volume located at a remote second storage site, while avoiding copying the first altered version onto other volumes at the first storage site. While asynchronously transferring the first altered version de-queuing a second modification request, and responsively to the second modification request synchronously transferring the first altered version from the first storage site to the target volume. Then a second altered version of the data is written to the single source volume and a copy transferred to the target volume in like manner.
摘要:
A method for generating a consistent point in time copy of data, the method includes: selecting at least one selected data block to be copied from a source volume to a target volume in response to a request to generate a consistent point in time copy of multiple data blocks; waiting until the source volume is ready to send the at least one selected data block to a remote volume while queuing at least one data block modify request; de-queuing the at least one queued modify requests while copying the at least one selected data block from the source volume to the target volume; wherein the copying includes utilizing a first copying mechanism to copy a first selected data block if a request to modify the first selected block is de-queued before the first selected data block is copied to the target volume; else, the copying includes using a second copying mechanism that is slower than the first copying mechanism.
摘要:
A method and computer readable product for managing data, the method includes: providing a first data structure representative of insert or update operations to entries identified by keys and providing a second data structure representative of branch creation operations wherein the second data structure stores branch identifiers and branch timing information; receiving a request to lookup a version of data at a read timestamp; scanning the first and the second data structures to locate that version of data; and receiving a request to create a branch that starts by a version of data at a requested timestamp and updating the second data structure accordingly.