Abstract: A method of data management in a data storage apparatus includes determining that a memory region (MR) stored in a first storage tier is suitable for hibernation. A tier-down operation is executed to move the MR to a second storage tier. In response to a remote direct memory access (RDMA) request to the MR from a client, a notification response is sent to the client to notify the client of the hibernated status of the MR. Moreover, in response to receiving a remote procedure call (RPC), from the client, the requested memory access is provided to the client. The requested memory access is provided to the client without any additional round-trip times (RTTs).

Abstract: In order to control a Random Direct Memory Access, RDMA to atomic data sectors defined is a sector atomic memory region (102) including atomic sectors (106A-N) of a predefined size to which a RDMA Network Interface Controller, RNIC (100, 202), provides access only to RDMA requests for atomic sectors that are sector size aligned and span one or more of the sectors. An array of counters is created to include a several bit counter for each atomic sector in the sector atomic memory region. Each counter has a bit 0 configured as a write lock bit and further bits configured as read counter bits to be indicative of ongoing operations with the associated atomic sector. The RNIC then handles RDMA requests for an atomic sector from a client using a counter of the atomic sector.

Abstract: A method of data management in a data storage apparatus includes determining that a memory region (MR) stored in a first storage tier is suitable for hibernation. A tier-down operation is executed to move the MR to a second storage tier. In response to a remote direct memory access (RDMA) request to the MR from a client, a notification response is sent to the client to notify the client of the hibernated status of the MR. Moreover, in response to receiving a remote procedure call (RPC), from the client, the requested memory access is provided to the client. The requested memory access is provided to the client without any additional round-trip times (RTTs).

Abstract: Logical mirroring of an initiator server running a memory aware file system to a multi-tiered target server by receiving at a first tier of the target server data that was modified at the initiator server and retaining at the first tier of the target server a first subset of the data and moving to a second tier of the target server a second subset of the data to efficiently utilize the multi-tiered target server.

Abstract: Method, system and product for direct access to de-duplicated data units in memory-based file systems. The method comprising: updating a page entry in a page table of a process to include a direct access pointer to a de-duplicated data unit retained by the memory-based file system, wherein the page entry is set to be write protected; detecting a page fault occurring due to the process performing a store instruction to the de-duplicated data unit; and in response to said detecting: allocating a new data unit; copying content of the de-duplicated data unit to the new data unit; and replacing the direct access pointer to the de-duplicated data unit with a direct access pointer to the new data unit.

Abstract: Method, system and product for direct access to de-duplicated data units in memory-based file systems. The method comprising: updating a page entry in a page table of a process to include a direct access pointer to a de-duplicated data unit retained by the memory-based file system, wherein the page entry is set to be write protected; detecting a page fault occurring due to the process performing a store instruction to the de-duplicated data unit; and in response to said detecting: allocating a new data unit; copying content of the de-duplicated data unit to the new data unit; and replacing the direct access pointer to the de-duplicated data unit with a direct access pointer to the new data unit.

Abstract: Method, system and product for direct access to de-duplicated data units in memory-based file systems. The method comprising: updating a page entry in a page table of a process to include a direct access pointer to a de-duplicated data unit retained by the memory-based file system, wherein the page entry is set to be write protected; detecting a page fault occurring due to the process performing a store instruction to the de-duplicated data unit; and in response to said detecting: allocating a new data unit; copying content of the de-duplicated data unit to the new data unit; and replacing the direct access pointer to the de-duplicated data unit with a direct access pointer to the new data unit.

Abstract: Logical minoring of an initiator server running a memory aware file system to a multi-tiered target server by receiving at a first tier of the target server data that was modified at the initiator server and retaining at the first tier of the target server a first subset of the data and moving to a second tier of the target server a second subset of the data to efficiently utilize the multi-tiered target server.

Abstract: Logical mirroring of an initiator server running a memory aware file system to a multi-tiered target server by receiving at a first tier of the target server data that was modified at the initiator server and retaining at the first tier of the target server a first subset of the data and moving to a second tier of the target server a second subset of the data to efficiently utilize the multi-tiered target server.

Abstract: A method and system for logical mirroring between nodes includes maintaining a log of a state modifying operation received at a memory-based file system of an initiator node; writing attributes of the state modifying operation from the memory-based file system to a target node memory, and using the written attributes to process the state modifying operation at the target node according to the order represented by the log, to obtain logical mirroring between the initiator node and the target node.

Abstract: Logical mirroring of an initiator server running a memory aware file system to a multi-tiered target server by receiving at a first tier of the target server data that was modified at the initiator server and retaining at the first tier of the target server a first subset of the data and moving to a second tier of the target server a second subset of the data to efficiently utilize the multi-tiered target server.

Abstract: Method, system and product for direct access to de-duplicated data units in memory-based file systems. The method comprising: updating a page entry in a page table of a process to include a direct access pointer to a de-duplicated data unit retained by the memory-based file system, wherein the page entry is set to be write protected; detecting a page fault occurring due to the process performing a store instruction to the de-duplicated data unit; and in response to said detecting: allocating a new data unit; copying content of the de-duplicated data unit to the new data unit; and replacing the direct access pointer to the de-duplicated data unit with a direct access pointer to the new data unit.

Abstract: A method and system for logical mirroring between nodes includes maintaining a log of a state modifying operation received at a memory-based file system of an initiator node; writing attributes of the state modifying operation from the memory-based file system to a target node memory, and using the written attributes to process the state modifying operation at the target node according to the order represented by the log, to obtain logical mirroring between the initiator node and the target node.