Address range transfer from first node to second node
First Claim
Patent Images
1. A first node, comprising:
- a group table including a first group that includes a first group address range that is mapped to a memory address range of a nonvolatile memory (NVM), the first group address range including a copy-on-write (COW) range, with a first memory address of the memory address range to be copied to a volatile memory if the first memory address is mapped to the COW range and a write access is requested for the first memory address; and
a controller to transfer address ranges included in the first group, including the first group address range, from the first node to a second node according to an order determined based on the group table, in response to a synchronize command, whereinthe controller is to transmit a marker after the transfer is complete, andthe controller is to write the copied address to the NVM after the second node acknowledges the marker.
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Abstract
A group address range is mapped to a memory address range of a nonvolatile memory. A first memory address of the memory address range is to be copied to a volatile memory if the first memory address is mapped to the group address range and a write access is requested for the first memory address. The group address range is transferred from a first node to a second node in response to a synch command. The copied address is to be written the NVM after the group address range is transferred.
30 Citations
20 Claims
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1. A first node, comprising:
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a group table including a first group that includes a first group address range that is mapped to a memory address range of a nonvolatile memory (NVM), the first group address range including a copy-on-write (COW) range, with a first memory address of the memory address range to be copied to a volatile memory if the first memory address is mapped to the COW range and a write access is requested for the first memory address; and a controller to transfer address ranges included in the first group, including the first group address range, from the first node to a second node according to an order determined based on the group table, in response to a synchronize command, wherein the controller is to transmit a marker after the transfer is complete, and the controller is to write the copied address to the NVM after the second node acknowledges the marker. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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receiving, at a first node, a synchronize command including a synchronize address range; identifying, in a group table that includes a number of group address ranges organized into groups, one of the group address ranges that includes the synchronize address range, wherein each of the group address ranges maps to a corresponding memory address range in a nonvolatile memory (NVM), and the identified group address range maps to a memory address range in the NVM that includes a first memory address that is identified for copy-on-write (COW) treatment; transferring data corresponding to the group that includes the indentified group address range from the first node to a second node in an order that is determined based on the group table; transmitting a marker from the first node to the second node after the transferring is completed; waiting for the second node to acknowledge the marker before writing a copied address corresponding to the first memory address to the NVM; and discarding the copied address in response to at least one of the transferring is not completed and the second node does not acknowledge the marker after a first threshold period. - View Dependent Claims (13)
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14. A non-transitory computer-readable storage medium storing instructions that, if executed by a processor of a device, cause the processor to:
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specify, in a group table at a first node, one or more groups that each include one or more group address ranges that are respectively mapped to memory address ranges of a nonvolatile memory (NVM); copy, at the first node, a first memory address of the memory address range to a volatile memory, in response to a write operation for the first memory address; and in response to a synchronize command that includes a synchronize address range; identify a group that corresponds to the synchronize address range, transfer address ranges associated with the identified group from the first node to the second node, transmit a marker from the first node to the second node after the transfer is completed, and if the transferred address ranges include the copied address; discard the copied address at the first node if the second node does not acknowledge the marker within a first threshold period, and write the copied address to the first memory address of the NVM if the second node acknowledges receipt of the marker. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification