US 12,705,212 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 a first node to a second node), the Reseed Time Period is lessened by proactively adding a passive cache entry to a cache within the second node at the time the CG relationship is created when the second node represents an HA partner of the first node and prior to the volume coming online when the second node represents a non-HA partner.

Claims20

Dependent claims

A method performed by one or more processing resources of a distributed storage system, the method comprising:

after a volume of a consistency group (CG) has been moved from a source node of a plurality of nodes of the distributed storage system to a destination node of the plurality of nodes, identifying those of the plurality of nodes affected by movement of the volume;
updating volume ownership information maintained by the distributed storage system to reflect volume ownership changes of the source node and the destination node resulting from the movement of the volume;
and
selectively causing one or more of (i) an existing cache entry maintained by at least one of the affected nodes to be modified, (ii) the existing cache entry to be removed, and (iii) a new cache entry to be created by at least another of the affected nodes.

1 more element

A distributed storage system in a form of a cluster of a plurality of nodes, the distributed storage system comprising:

one or more processors;
and
one or more non-transitory computer-readable media, coupled to the one or more processors, having stored therein instructions that when executed by the one or more processors cause the distributed storage system to:
after a volume of a consistency group (CG) has been moved from a source node of a plurality of nodes of the distributed storage system to a destination node of the plurality of nodes, identify those of the plurality of nodes affected by movement of the volume;
update volume ownership information maintained by the distributed storage system to reflect volume ownership changes of the source node and the destination node resulting from the movement of the volume;
and
selectively cause one or more of (i) an existing cache entry maintained by at least one of the affected nodes to be modified, (ii) the existing cache entry to be removed, and (iii) a new cache entry to be created by at least another of the affected nodes.

4 more elements

A non-transitory computer-readable storage medium embodying a set of instructions, which when executed by one or more processors of a distributed storage system represented in a form of a cluster of a plurality of nodes, cause the distributed storage system to:

after a volume of a consistency group (CG) has been moved from a source node of the plurality of nodes to a destination node of the plurality of nodes, identify those of the plurality of nodes affected by movement of the volume;
update volume ownership information maintained by the distributed storage system to reflect volume ownership changes of the source node and the destination node resulting from the movement of the volume;
and
selectively cause one or more of (i) an existing cache entry maintained by at least one of the affected nodes to be modified, (ii) the existing cache entry to be removed, and (iii) a new cache entry to be created by at least another of the affected nodes.

1 more element

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

Claims20