US 2020/0026429 A1Published application

Storage system with multi-phase verification of synchronously replicated data

AssigneeEMC IP Holding Company LLC

InventorsXiangping Chen, Svetlana Kronrod

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Abstract

A storage system in one embodiment is configured to participate as a source storage system in a synchronous replication process with a target storage system. In verifying synchronously replicated data, the source storage system generates a current snapshot for one or more storage volumes subject to synchronous replication to the target storage system, identifies a plurality of pages of the current snapshot that have changed since generation of a previous snapshot for the one or more storage volumes, obtains content-based signatures for respective ones of the changed pages, assigns the changed pages to a page group, generates a group signature for the page group based at least in part on the content-based signatures of the pages of the page group, and sends the group signature to the target storage system. The group signature is configured to allow the target storage system to determine if the page group contains at least one page that is inconsistent between the source and target storage systems.

Claims20

Dependent claims

An apparatus comprising:

a storage system comprising a plurality of storage devices and a storage controller;
the storage system being configured to participate as a source storage system in a synchronous replication process with a target storage system;
wherein in conjunction with the synchronous replication process, the source storage system in performing data verification operations is further configured:
to generate a current snapshot for one or more storage volumes subject to synchronous replication to the target storage system;
to identify a plurality of pages of the current snapshot that have changed since generation of a previous snapshot for the one or more storage volumes;
to obtain content-based signatures for respective ones of the changed pages;
to assign the changed pages to a page group;
to generate a group signature for the page group based at least in part on the content-based signatures of the pages of the page group;
and
to send the group signature to the target storage system;
wherein the group signature is configured to allow the target storage system to determine if the page group contains at least one page that is inconsistent between the source and target storage systems;
and
wherein the source storage system is implemented using at least one processing device comprising a processor coupled to a memory.

10 more elements

A method comprising:

configuring a storage system to participate as a source storage system in a synchronous replication process with a target storage system;
and
in conjunction with the synchronous replication process, the source storage system performing data verification operations comprising:
generating a current snapshot for one or more storage volumes subject to synchronous replication to the target storage system;
identifying a plurality of pages of the current snapshot that have changed since generation of a previous snapshot for the one or more storage volumes;
obtaining content-based signatures for respective ones of the changed pages;
assigning the changed pages to a page group;
generating a group signature for the page group based at least in part on the content-based signatures of the pages of the page group;
and
sending the group signature to the target storage system;
wherein the group signature is configured to allow the target storage system to determine if the page group contains at least one page that is inconsistent between the source and target storage systems;
and
wherein the method is implemented by at least one processing device comprising a processor coupled to a memory.

10 more elements

A computer program product comprising a non-transitory processor-readable storage medium having stored therein program code of one or more software programs, wherein the program code when executed by at least one processing device causes said at least one processing device:

to configure a storage system to participate as a source storage system in a synchronous replication process with a target storage system;
and
in conjunction with the synchronous replication process, to configure the source storage system in performing data verification operations:
to generate a current snapshot for one or more storage volumes subject to synchronous replication to the target storage system;
to identify a plurality of pages of the current snapshot that have changed since generation of a previous snapshot for the one or more storage volumes;
to obtain content-based signatures for respective ones of the changed pages;
to assign the changed pages to a page group;
to generate a group signature for the page group based at least in part on the content-based signatures of the pages of the page group;
and
to send the group signature to the target storage system;
wherein the group signature is configured to allow the target storage system to determine if the page group contains at least one page that is inconsistent between the source and target storage systems

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/042,503Filed 23 Jul 2018
Published: 23 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G06F 3/065
Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems: replication mechanisms
G06F 3/0619
Improving the reliability of storage systems: in relation to data integrity, e.g. data losses, bit errors
G06F 3/067
Adopting a particular infrastructure: distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
G06F 11/1451
Management of the data involved in backup or backup restore: by selection of backup contents