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Efficient Replication of Virtual Server Data over Long Distances for DR in Clouds Disclosure Number: IPCOM000243488D
Publication Date: 2015-Sep-24
Document File: 3 page(s) / 113K

Publishing Venue

The Prior Art Database


Disclosed is a Data Recovery (DR) method that is a hybrid of Low and High Recovery Point Objective (RPO) methods in order to minimize dynamic data transfer.

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Efficient Replication of Virtual Server Data over Long Distances for DR in Clouds

Low Recovery Point Objective (RPO) Data Recovery (DR) systems rely on long distance backup for data replication. High RPO DR systems reply on data replication over the wire.

Current techniques for DR include:

• Storage manager node replication: takes file back up on source site and pushes data to target site over wire. On a remote site, files are backed up to disks or tape.

• Client-server with Agent: install agent on VM; copy all changed data over the network to server in remote location

• Global mirroring: block-copy data from storage to remote storage over the network

DR of cloud systems can be set up by provisioning two copies in parallel in two sites that are geographically separated from each other. Hence, the virtual machines (VMs) are initially identical data copies of each other. The target instance (i.e. DR site) may be active, passive, or switched off; this disclosure deals with a passive instance.

The novel contribution is a hybrid method that minimizes dynamic data transfer for DR .

The algorithm for the Active-Passive Target follows:

1. Ascertain that both source and target virtual server have the same binary (derived from same image template)

2. Take initial back up of the source VM. Parallel Provisioning produces VM copy locally and remotely; no need to create file-based back up on either side.

3. On the target VM take a backup of just the file structure of the source VM

4. When a file is added to the source , use remote backup to back the file up on the target's backup server pool

5. When a file or dir is changed on the source

A. Back up locally (TSM daily) stream during backup (ship th...