SNAPSHOT AND REPLICATION OF A MULTI-STREAM APPLICATION ON MULTIPLE HOSTS AT NEAR-SYNC FREQUENCY

摘要

Storage access requests are received from one or more applications. Multiple servers update multiple virtual disks as directed by the storage access requests. The virtual disks store data that is write order dependent across the virtual disks. Logs are associated with the virtual disks. Information associated with each storage access request is stored in one of the logs. A cycle of log switching is performed. A write order consistent tracking coordinator coordinates the log switching with agents at the servers to maintain request ordering. Replication coordinators coordinate the application of the switched-out log files from primary storage to replica storage, creating a write-order consistent point on the replica side matching the primary side, and providing for failure resiliency regarding transfer of the logs. The replication logs may be received individually on the replica side from the servers on the primary side to enable highly scalable parallel/simultaneous transfers of the logs.