Microsoft Technology Licensing, LLC

Sriravi Kotagiri

Rahul Newaskar

Ajay Arvind Bhave

Yadnyesh Joshi

Palash Kar

Dustin Lyle Green

Shreesh Rajendra Dubey

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.

Snapshot and replication of a multi-stream application on multiple hosts at near-sync frequency

Storage access requests, such as write requests, are received from a virtual machine. A storage request processing module updates one of multiple virtual disks as directed by each of the storage access requests, and a replication management module stores information associated with each storage access request in one of multiple logs. The logs can be transferred to a recovery device at various intervals and/or in response to various events, which results in switching logs so that the replication management module stores the information associated with each storage access request in a new log and the previous (old) log is transferred to the recovery device. During this switching, request ordering for write order dependent requests is maintained at least in part by blocking processing of the information associated with each storage access request.

Request ordering support when switching virtual disk replication logs

This application describes a system and techniques for managing the replication, migration, or backing up of virtual machines (VM) operating on a computing device. The techniques include managing real time or near real replication or migration of VM operations logs between computing devices. The operations logs include information or data that would enable another VM to function or operate in the same manner as the VM that generated the operations logs. Techniques are presented herein to insure the replication or migration process of VMs is not open ended or indefinite. For example, the write rate of the source operations log is managed to insure the replication or migration of the source operations log to destination device terminates within a reasonable amount of time.

System for replicating or migrating virtual machine operations log by throttling guest write iOS based on destination throughput

Techniques involving replication of virtual machines at a target site are described. One representative technique includes an apparatus including a virtual machine configured to provide storage access requests targeting a virtual disk. A storage request processing module is coupled to the virtual machine to receive the storage access requests and update the virtual disk as directed by the storage access requests. A replication management module is coupled to the virtual machine to receive the storage access requests in parallel with the storage request processing module, and to store information associated with the storage access requests in a log file(s). The log file may be transferred to a destination as a recovery replica of at least a portion of the virtual disk.

Growing community of inventors

Hyderabad Telangana, India

Sriravi Kotagiri