REPLICATING DATA USING REMOTE DIRECT MEMORY ACCESS (RDMA)

• US 20170052723A1
• Filed: 06/10/2014
• Published: 02/23/2017
• Est. Priority Date: 06/10/2014
• Status: Abandoned Application

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Inventors: Voigt, Douglas L.
• Application Number:
  US15/305,478
• Publication Number:
  US 20170052723A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 12/10 Address translation
• CPC Class Codes: G06F 13/28 using burst mode transfer, e.g. direct memory access DMA, cycle steal G06F13/32 takes precedence
• CPC Class Codes: G06F 15/17331 Distributed shared memory [DSM], e.g. remote direct memory access [RDMA]
• CPC Class Codes: G06F 2206/1014 One time programmable [OTP] memory, e.g. PROM, WORM
• CPC Class Codes: G06F 2212/1024 Latency reduction
• CPC Class Codes: G06F 2212/7201 Logical to physical mapping or translation of blocks or pages
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
• CPC Class Codes: G06F 9/06 using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
• CPC Class Codes: G06F 9/3004 to perform operations on memory
• CPC Class Codes: G06F 9/30087 Synchronisation or serialisation instructions
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

Example implementations relate to replicating data using remote directory memory access (RDMA). In example implementations, addresses may be registered in response to a map command. Data may be replicated using an RDMA.

Claims

1. A machine-readable storage medium encoded with instructions executable by a processor, the machine-readable storage medium comprising:

instructions to register, in response to a map command, a first plurality of virtual addresses specified by the map command;

instructions to identify data associated with a plurality of synchronization (sync) commands that specify any of the first plurality of virtual addresses; and

instructions to initiate, in response to a remote synchronization (rsync) command, a remote direct memory access (RDMA) to replicate, in accordance with boundary indications in the plurality of sync commands, the identified data in a remote storage entity.

2. The machine-readable storage medium of claim 1, further comprising instructions to associate each of a second plurality of virtual addresses with a respective one of the first plurality of virtual addresses, wherein the identified data is replicated in memory locations, of the remote storage entity, that correspond to respective ones of the second plurality of virtual addresses associated with respective ones of the first plurality of virtual addresses specified by the plurality of sync commands.

3. The machine-readable storage medium of claim 1, wherein the identified data is replicated in a memristor-based non-volatile memory (NVM) of the remote storage entity.

4. The machine-readable storage medium of claim 1, further comprising:

instructions to start a timer in response to the map command; and

instructions to generate the rsync command when the timer reaches a predetermined value.

5. The machine-readable storage medium of claim 1, further comprising instructions to transmit, using the RDMA, the rsync command after the plurality of sync commands have been executed.

6. The machine-readable storage medium of claim 1, further comprising instructions to maintain an acknowledgment counter to track completion of replication of data associated with the plurality of sync commands.

7. A system comprising:

an address identification module to identify, in response to a map command, a plurality of memory addresses in a non-volatile memory (NVM), wherein the map command comprises a first plurality of virtual addresses;

an address generation module to generate, in response to the map command, a second plurality of virtual addresses, wherein;

each of the second plurality of virtual addresses is registered for remote direct memory accesses (RDMAs) of the NVM, and is associated with a respective one of the first plurality of virtual addresses; and

each of the second plurality of virtual addresses corresponds to a respective one of the identified plurality of memory addresses in the NVM; and

a replication module to replicate, using an RDMA, and in response to a remote synchronization (rsync) command, data associated with a plurality of synchronization (sync) commands that specify any of the first plurality of virtual addresses,

8. The system of claim 7, wherein:

the data associated with the plurality of sync commands is replicated in the NVM in accordance with boundary indications in the plurality of sync commands; and

the data associated with the plurality of sync commands is replicated at memory addresses, of the identified plurality of memory addresses in the NVM, that correspond to respective ones of the second plurality of virtual addresses associated with respective ones of the first plurality of virtual addresses specified by the plurality of sync commands.

9. The system of claim 7, further comprising an access module to transmit an authentication token for the RDMA.

10. The system of claim 7, wherein:

the NVM is a memristor-based NVM; and

the replication module is further to transmit a completion notification after the data associated with the plurality of sync commands has been replicated.

11. The system of claim 7, further comprising an order module to enforce an order in which a plurality of RDMAs are performed.

12. A method comprising:

registering, in response to a map command, a first plurality of virtual addresses specified by the map command;

identifying data associated with a first plurality of synchronization (sync) commands that specify any of the first plurality of virtual addresses; and

transmitting a first remote synchronization (rsync) command to replicate, using a remote direct memory access (RDMA), the identified data in a remote storage entity, wherein the identified data is replicated in accordance with boundary indications in the first plurality of sync commands.

13. The method of claim 12, wherein the first rsync command is transmitted, using the RDMA, after the first plurality of sync commands have been executed.

14. The method of claim 12, further comprising:

transmitting a second plurality of sync commands and a third plurality of sync commands after the first rsync command is transmitted and before a second rsync command is transmitted, wherein data associated with the second plurality of sync commands is replicated in the remote storage entity using RDMAs that occur after the first rsync command is transmitted and before the second rsync command is transmitted; and

transmitting the second rsync command, wherein data associated with the third plurality of sync commands is replicated in the remote storage entity using RDMAs that occur after the second rsync command is transmitted.

15. The method of claim 12, wherein the identified data is replicated in a memristor-based non-volatile memory (NVM) of the remote storage entity, the method further comprising starting a timer in response to the map command, wherein the first rsync command is transmitted when the timer reaches a predetermined value.