US 11,232,128 B2Granted

Storage systems configured with time-to-live clustering for replication in active-active configuration

AssigneeEMC IP Holding Company LLC

InventorDavid Meiri

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Abstract

A first storage system is configured to participate in a replication process with a second storage system using an active-active configuration. A request for a time-to-live (TTL) grant is received in the first storage system from the second storage system. A TTL projection time maintained in the first storage system is updated as a function of a current value of the TTL projection time, a local time in the first storage system and a TTL grant value. The TTL grant with the TTL grant value is sent from the first storage system to the second storage system in response to the request. The TTL projection time maintained in the first storage system is utilized in conjunction with revocation of the TTL grant to the second storage system. The TTL projection time illustratively specifies a time after which it is guaranteed that the TTL grant sent by the first storage system to the second storage system will have expired in accordance with a TTL expiration time maintained in the second storage system.

Claims20

Dependent claims

An apparatus comprising:

at least one processing device comprising a processor coupled to a memory;
said at least one processing device being configured:
to receive in a first storage system a request for a time-to-live (TTL) grant from a second storage system, the first storage system being configured to participate in a replication process with the second storage system, the first and second storage systems being arranged in an active-active configuration relative to one another;
to update a TTL projection time maintained in the first storage system as a function of a current value of the TTL projection time, a local time in the first storage system and a TTL grant value;
to send the TTL grant with the TTL grant value from the first storage system to the second storage system in response to the request;
and
to utilize the TTL projection time maintained in the first storage system in conjunction with revocation of the TTL grant to the second storage system;
wherein updating the TTL projection time as the function of the current value of the TTL projection time, the local time in the first storage system and the TTL grant value comprises setting the TTL projection time to the greater of:
(a) the current value of the TTL projection time;
and
(b) a value based at least in part on (i) the local time in the first storage system and (ii) the TTL grant value.

8 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 receive in a first storage system a request for a time-to-live (TTL) grant from a second storage system, the first storage system being configured to participate in a replication process with the second storage system, the first and second storage systems being arranged in an active-active configuration relative to one another;
to update a TTL projection time maintained in the first storage system as a function of a current value of the TTL projection time, a local time in the first storage system and a TTL grant value;
to send the TTL grant with the TTL grant value from the first storage system to the second storage system in response to the request;
and
to utilize the TTL projection time maintained in the first storage system in conjunction with revocation of the TTL grant to the second storage system;
wherein updating the TTL projection time as the function of the current value of the TTL projection time, the local time in the first storage system and the TTL grant value comprises setting the TTL projection time to the greater of:
(a) the current value of the TTL projection time;
and
(b) a value based at least in part on (i) the local time in the first storage system and (ii) the TTL grant value.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/246,984Filed 14 Jan 2019
Published: US 2020/0226145 A116 Jul 2020
Granted: 25 Jan 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G06F 3/065
Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems: replication mechanisms
G06F 16/27
Of structured data, e.g. relational data: replication, distribution or synchronisation of data between databases or within a distributed database…
G06F 3/0604
Specifically adapted to achieve a particular effect: improving or facilitating administration, e.g. storage management
G06F 3/0614
Specifically adapted to achieve a particular effect: improving the reliability of storage systems