Replication link smoothing using historical data

Patent metadata

Field	Value
Publication number	US-11226868-B2
Application number	US-201916669823-A
Country	US
Kind code	B2
Filing date	Oct 31, 2019
Priority date	Apr 27, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

An aspect includes determining a host write rate based on a number of chunks written to a storage volume during a first replication cycle and determining a target rate based on an estimated number of chunks written during a second replication cycle. The target rate is determined by dividing the number of chunks written during the second replication cycle by a recovery point objective (RPO) period. An aspect also includes transmitting chunks written during the second replication cycle at the target rate.

First claim

What is claimed is:

1. A method comprising:
determining a host write rate based on a number of chunks written to a storage volume during a first replication cycle;
determining a target rate based on an estimated number of chunks written during a 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;
transmitting chunks written during the second replication cycle at the target rate; and
wherein the number of chunks written during the second replication cycle is estimated by multiplying the host write rate based on the first replication cycle by a length of the second replication cycle.

2. The method of claim 1 , wherein the RPO period is comprised of a number of time units that collectively form each of the first replication cycle and the second replication cycle.

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

4. The method of claim 1 , wherein the estimated number of chunks is increased in number prior to the dividing the number of chunks by the RPO period resulting in replication completing prior to completion of the RPO period.

5. The method of claim 1 , wherein the storage volume resides in a content-based storage system, and the transmitting chunks is implemented by a replication subsystem of the content-based storage system.

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

7. The system of claim 1 , wherein the RPO period is defined by a user.

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 operations comprising:
determining a host write rate based on a number of chunks written to a storage volume during a first replication cycle;
determining a target rate based on an estimated number of chunks written during a 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;
transmitting chunks written during the second replication cycle at the target rate; and
wherein the number of chunks written during the second replication cycle is estimated by multiplying the host write rate based on the first replication cycle by a length of the second replication cycle.

9. The system of claim 8 , wherein the RPO period is comprised of a number of time units that collectively form each of the first replication cycle and the second replication cycle.

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

11. The system of claim 8 , wherein the estimated number of chunks is increased in number prior to the dividing the number of chunks by the RPO period resulting in replication completing prior to completion of the RPO period.

12. The system of claim 8 , wherein the storage volume resides in a content-based storage system, and the transmitting chunks is implemented by a replication subsystem of the content-based storage system.

13. A computer program product tangibly embodied in a non-transitory computer-readable medium, the computer-readable medium storing program instructions comprising:
determining a host write rate based on a number of chunks written to a storage volume during a first replication cycle;
determining a target rate based on an estimated number of chunks written during a 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;
transmitting chunks written during the second replication cycle at the target rate; and
wherein the number of chunks written during the second replication cycle is estimated by multiplying the host write rate based on the first replication cycle by a length of the second replication cycle.

14. The computer program product of claim 13 , wherein the RPO period is comprised of a number of time units that collectively form each of the first replication cycle and the second replication cycle.

15. The computer program product of claim 13 , wherein the number of chunks written to the storage volume during the first replication cycle is determined by comparing two address-to-hash (A2H) tables associated with consecutive snapshots of the storage volume.

16. The computer program product of claim 13 , wherein the estimated number of chunks is increased in number prior to the dividing the number of chunks by the RPO period resulting in replication completing prior to completion of the RPO period.

17. The computer program product of claim 13 , wherein the storage volume resides in a content-based storage system, and the transmitting chunks is implemented by a replication subsystem of the content-based storage system.

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

• G06F2201/84

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

• G06F11/2074

  Asynchronous techniques · CPC title

• G06F11/2066

  Optimisation of the communication load · CPC title

• G06F16/2365

  Ensuring data consistency and integrity · CPC title