US 11,892,982 B2 · Facilitating immediate performance of volume resynchronization with the use of passive cache entries

Abstract

Systems and methods for reducing delays between the time at which a need for a resynchronization of data replication between a volume of a local CG and its peer volume of a remote CG is detected and the time at which the resynchronization is triggered (Reseed Time Period) are provided. According to an example, information indicative of the direction of data replication between the volume and the peer volume is maintained within a cache of a node. Responsive to a disruptive operation (e.g., relocation of the volume from an original node to a new node), the Reseed Time Period is lessened by proactively adding a passive cache entry to a cache within the new node at the time the CG relationship is created when the new node represents an HA partner of the original node and prior to the volume coming online when the new node represents a non-HA partner.

Claims26

Dependent claims

A method performed by a processing resource of a node of a plurality of nodes of a cluster representing a distributed storage system, the method comprising:

for each volume of a set of volumes owned by the node and representing a member of a local consistency group (CG), maintaining an entry within a cache of the node containing volume-level CG relationship information for the volume and a peered volume representing a member of a remote CG of a remote cluster, wherein the volume-level CG relationship information identifies the volume as either a source or a destination of data replication with respect to the peered volume;
and
responsive to receipt by the node of an add volume event for a first volume, adding a passive cache entry, containing the volume-level CG relationship information for the first volume, to the cache, wherein the node represents a non-high-availability (HA) partner node of an original node of the plurality of nodes from which the first volume is being relocated.

A cluster of a plurality of nodes collectively representing a distributed storage system, the cluster comprising:

one or more processing resources;
and
one or more non-transitory computer-readable media, coupled to the one or more processing resources, having stored therein instructions that when executed by the one or more processing resource cause the cluster to:
responsive to a disruptive operation affecting a status of data replication between a peered pair of volumes, including a first volume of a set of volumes of a first node of the plurality of nodes and a second volume of a second node of a remote cluster, determine whether the disruptive operation represents a first scenario involving a relocation of the first volume from the first node to a high-availability (HA) partner node within the cluster or a second scenario involving a relocation of the first volume from the first node to a non-HA partner node within the cluster;
responsive to the first scenario, facilitate resynchronization of the data replication by converting an existing passive cache entry containing information indicative of the peered pair of volumes within a cache of the HA partner node to an active cache entry;
and
responsive to the second scenario, prior to the first volume coming online in the non-HA partner node, create a new passive cache entry containing the information indicative of the peered pair of volumes within a cache of the non-HA partner node.

4 more elements

Dependencies are inferred from the claim text.

Facilitating immediate performance of volume resynchronization with the use of passive cache entries

Life of this patent

Facilitating immediate performance of volume resynchronization with the use of passive cache entries

Life of this patent

Abstract

Claims26