Asymmetric data mirroring

Patent metadata

Field	Value
Publication number	US-10044805-B2
Application number	US-201615075287-A
Country	US
Kind code	B2
Filing date	Mar 21, 2016
Priority date	Aug 27, 2002
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

Methods, systems, and products mirror data between local memory and remote storage. A write command is sent from a server to a remote storage device, and a timer is established. A current time of the timer is compared to a maximum time period. If the maximum time period expires without receipt of an acknowledgment to the write command, then a write error is assumed to exist to the remote storage device.

First claim

What is claimed is:

1. A method, comprising:
determining, by a system including a processor, a time of latency associated with an electronic request to mirror data sent to a remote storage device, the electronic request to mirror the data associated with another electronic request to store the data sent to a local storage device;
monitoring, by the system, for a receipt of an acknowledgment from the remote storage device;
determining, by the system, an expiration of the time of latency without the receipt of the acknowledgment from the remote storage device; and
submitting, by the system, an additional request to the remote storage device in response to the expiration of the time of latency.

2. The method of claim 1 , further comprising using a ping command for the determining of the time of latency.

3. The method of claim 1 , wherein the determining of the time of latency comprises retrieving the time of latency from a memory accessible to the system.

4. The method of claim 1 , further comprising erasing a block of the data responsive to the expiration of the time of latency.

5. The method of claim 1 , further comprising caching the data to the local storage device.

6. The method of claim 1 , further comprising initializing a timer that counts the time of latency.

7. The method of claim 6 , further comprising re-establishing the timer in response to the resubmitting of the additional request.

8. A system, comprising:
a processor; and
a memory device for storing instructions that, responsive to being executed by the processor, cause the processor to perform operations, the operations comprising:
determining a time of latency associated with an electronic request to mirror data sent to a remote storage device, the electronic request to mirror the data associated with another electronic request to store the data sent to a local storage device;
generating an additional request to the remote storage device while monitoring for a receipt of an acknowledgment sent from the remote storage device;
determining an expiration of the time of latency without the receipt of the acknowledgment sent from the remote storage device; and
submitting the additional request to the remote storage device in response to the expiration of the time of latency.

9. The system of claim 8 , wherein the operations further comprise determining the time of latency using a ping command.

10. The system of claim 8 , wherein the operations further comprise retrieving the time of latency from the memory device.

11. The system of claim 8 , wherein the operations further comprise erasing a block of the data responsive to the expiration of the time of latency.

12. The system of claim 8 , wherein the operations further comprise caching the data to the local storage device.

13. The system of claim 8 , wherein the operations further comprise initializing a timer that counts the time of latency.

14. The system of claim 13 , wherein the operations further comprise re-establishing the timer responsive to the resubmitting of the additional request.

15. A memory device storing instructions that when executed cause a processor to perform operations, the operations comprising:
determining a time of latency associated with a request to store data to a local storage device and to mirror the data to a remote storage device;
submitting an additional request to the remote storage device while monitoring for a receipt of an acknowledgment sent from the remote storage device;
determining an expiration of the time of latency prior to the receipt of the acknowledgment sent from the remote storage device; and
resubmitting the additional request to the remote storage device in a response to the expiration of the time of latency.

16. The memory device of claim 15 , wherein the operations further comprise determining the time of latency using a ping command.

17. The memory device of claim 15 , wherein the operations further comprise retrieving the time of latency from the memory device.

18. The memory device of claim 15 , wherein the operations further comprise erasing a block of the data in response to the expiration of the time of latency.

19. The memory device of claim 15 , wherein the operations further comprise caching the data to the local storage device.

20. The memory device of claim 15 , wherein the operations further comprise initializing a timer that counts the time of latency.

Assignees

• At&T Intellectual Property Ii Lp
• At & T Ip Ii Lp

Inventors

• Gardner James A
• Freeman Darrell G

Classifications

• G06F11/2071

  using a plurality of controllers · CPC title

• G06F11/2064

  while ensuring consistency · CPC title

• H04L67/1095

  Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes · CPC title

• G06F11/1443 Primary

  Transmit or communication errors · CPC title

• H04L67/1097 Primary

  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] · CPC title