Replication link smoothing using historical data

Patent metadata

Field	Value
Publication number	US-10503609-B1
Application number	US-201715499199-A
Country	US
Kind code	B1
Filing date	Apr 27, 2017
Priority date	Apr 27, 2017
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A computer program product, system, and method for determining a number of chunks written to a storage volume during a first replication cycle; determining a host write rate based on the number of chunks written to the storage volume during the first replication cycle; estimating a number of chunks written during a second replication cycle; determining a target rate based on the estimated number of chunks written during the second replication cycle; and transmitting chunks written during the second replication cycle at the target rate.

First claim

What is claimed is:

1. A method comprising:
determining a number of chunks written to a storage volume during a first replication cycle;
determining a host write rate based on the number of chunks written to the storage volume during the first replication cycle;
estimating a number of chunks written during a second replication cycle;
determining a target rate based on the estimated number of chunks written during the second replication cycle, the target rate determined by dividing the number of chunks written during the second replication cycle by a recovery point objective (RPO) period; and
transmitting chunks written during the second replication cycle at the target rate.

2. The method of claim 1 wherein the storage volume is storage volume with a content-based storage system.

3. The method of claim 1 wherein determining a number of chunks written to a storage volume during a first replication cycle includes comparing two address-to-hash (A2H) tables associated with consecutive snapshots of the storage volume.

4. The method of claim 1 wherein estimating a number of chunks written during a second replication cycle includes multiplying the host write rate based on the first replication cycle by a length of the second replication cycle.

5. The method of claim 1 wherein the RPO period is defined by a user.

6. The method of claim 1 wherein dividing the number of chunks written during the second replication cycle by a RPO period includes scaling the number of chunks written during the second replication cycle.

7. The method of claim 6 , wherein the scaling includes increasing the estimated number of chunks written prior to dividing the estimated number of chunks written by the RPO period, such that the transmitting the chunks written at the target rate occurs within the RPO period.

8. A system comprising:
a processor;
a volatile memory; and
a non-volatile memory storing computer program code that when executed on the processor causes the processor to execute a process operable to:
determine a number of chunks written to a storage volume during a first replication cycle;
determine a host write rate based on the number of chunks written to the storage volume during the first replication cycle;
estimate a number of chunks written during a second replication cycle;
determine a target rate based on the estimated number of chunks written during the second replication cycle, the target rate determined by dividing the number of chunks written during the second replication cycle by a recovery point objective (RPO) period; and
transmit chunks written during the second replication cycle at the target rate.

9. The system of claim 8 wherein the storage volume is storage volume with a content-based storage system.

10. The system of claim 8 wherein determining a number of chunks written to a storage volume during a first replication cycle includes comparing two address-to-hash (A2H) tables associated with consecutive snapshots of the storage volume.

11. The system of claim 8 wherein estimating a number of chunks written during a second replication cycle includes multiplying the host write rate based on the first replication cycle by a length of the second replication cycle.

12. The system of claim 8 wherein the RPO period is defined by a user.

13. The system of claim 8 wherein dividing the number of chunks written during the second replication cycle by a RPO period includes scaling the number of chunks written during the second replication cycle.

14. A computer program product tangibly embodied in a non-transitory computer-readable medium, the computer-readable medium storing program instructions that are executable to:
determine a number of chunks written to a storage volume during a first replication cycle;
determine a host write rate based on the number of chunks written to the storage volume during the first replication cycle;
estimate a number of chunks written during a second replication cycle;
determine a target rate based on the estimated number of chunks written during the second replication cycle, the target rate determined by dividing the number of chunks written during the second replication cycle by a recovery point objective (RPO) period; and
transmit chunks written during the second replication cycle at the target rate.

15. The computer program product of claim 14 wherein the storage volume is storage volume with a content-based storage system.

16. The computer program product of claim 14 wherein determining a number of chunks written to a storage volume during a first replication cycle includes comparing two address-to-hash (A2H) tables associated with consecutive snapshots of the storage volume.

17. The computer program product of claim 14 wherein estimating a number of chunks written during a second replication cycle includes multiplying the host write rate based on the first replication cycle by a length of the second replication cycle.

18. The computer program product of claim 14 wherein the RPO period is defined by a user.

19. The computer program product of claim 14 wherein dividing the number of chunks written during the second replication cycle by a RPO period includes scaling the number of chunks written during the second replication cycle.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Stronge William
• Meiri David

Classifications

• G06F16/128 Primary

  Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion (error detection or correction of the data by redundancy in operations or in hardware G06F11/14, G06F11/16) · CPC title

• G06F16/27

  Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor · CPC title

• G06F2201/84

  Using snapshots, i.e. a logical point-in-time copy of the data · CPC title

• G06F16/2365

  Ensuring data consistency and integrity · CPC title

• G06F11/1464 Primary

  for networked environments · CPC title