Patent ID: 9449014
Filing Date: 2016-09-20
CPC Classification: G06F

Claim Text:
1. A method, comprising: determining an initial data tuple for a chunk of data during replication of the chunk of data from a source node to a target node, the initial data tuple comprising an initial sequence number and an initial hash value, the initial sequence number indicating a number of times the chunk of data has been modified, the initial hash value comprising the result of applying a hash function to the chunk of data; transmitting the initial data tuple for the chunk of data to the target node; maintaining the initial data tuple at both the source node and the target node thereby forming a maintained source data tuple and a maintained target data tuple, wherein the maintained source data tuple includes a maintained source hash value and a maintained source sequence number corresponding to the initial sequence number, and wherein the maintained target data tuple includes a maintained target hash value and a maintained target sequence number corresponding to the initial sequence number; receiving a request to determine whether data corresponding to the chunk at the source node is synchronized with the data corresponding to the chunk at the target node, the request corresponding to the maintained source data tuple and the maintained target data tuple; determining whether the data at the source node is synchronized with the data at the target node by comparing a current source sequence number, separate from the maintained source sequence number, at the source node to the maintained source sequence number at the source node to indicate whether the data chunk has been modified at the source node, by comparing a current target sequence number, separate from the maintained target sequence number, at the target node to the maintained target sequence number at the target node to determine whether the data chunk has been modified at the target node, and by comparing the maintained source data tuple at the source node to the maintained target data tuple at the target node to determine if the data chunk is out-of-sync, wherein the current source sequence number is separate from the current target sequence number; and performing resynchronization if the data at the source node is determined to not be synchronized with the data at the target node.