Abstract: A system, method, and computer product for enabling a virtual service layer to consume a first storage medium and a second storage medium and map the storage mediums as one or more virtual storage volumes; wherein the one or more virtual volumes are mirrored at a first site and a second site, mirroring of the virtual storage volumes on a distributed mirror, and enabling a distributed replication service to create a continuous data protection image of the data written to one or more virtual storage volumes.

Abstract: A method, system, and program product for creating compatibility between two program interfaces comprising determining differences the interfaces; and generating code to create a compatibility layer between the first interface and second interface based on the differences between the interfaces.

Abstract: A computer implemented method, system, and computer program product for determining how to replicate one or more volumes, the method comprising sending IOs from an IO stack through a virtual analysis filter and based on the IO sent through the virtual analysis filter, determining a number of virtual splitters and virtual data protection appliances, required WAN capacity and configuration of a replication system.

Abstract: A computer implemented method, system, and computer program product for replicating multiple tenants comprising creating a first sub cluster at a production site; wherein the production site has a cluster of replication appliances and wherein the sub-cluster comprises a subset of the replication appliances in the cluster of replication appliance at the production site, creating a second sub cluster at a replication site comprising of a subset of replication appliances in the cluster of replication appliance at the production cluster, and creating a replication subsystem comprising of the first and second sub-clusters and replicating from the production sub-cluster to the replica sub cluster.

Abstract: A computer implemented method, system, and computer program product for recovering from a crash of a system being replicated, the method comprising determining the amount of recovery time due to the crash of each of a set of hypervisors; wherein each of the hypervisors runs one or more data replication elements selected from the group consisting of a splitter and a replication appliance; wherein each of the splitters and replication appliances replicates one or more volumes, creating an assignment of the one or more volumes to the set of replication appliances and creating an assignment of one or more replication appliances to a set of hypervisors to minimize the amount of recovery time.

Abstract: In one aspect, a method includes receiving a first I/O at a kernel interface using a pseudo data storage system, writing the first I/O to a first virtual device on a datastore, receiving a second I/O at the kernel interface using the pseudo data storage system and writing the second I/O to a second virtual device on the datastore.

Abstract: In one aspect, a method to upgrade software on nodes in a clustered environment, includes terminating processes on a first node before upgrading the software on the first node, upgrading the software to a first version from a second version on the first node, running the processes on the first node after upgrading the software on the first node to the first version, determining whether a second node is about to upgrade to the first version of software, allowing transfer of site control from the second node to the first node, if the second node is about to upgrade to the first version of software and upgrading the software on the second node to the first version of software after the transferring of site control from the second node to the first node.

Abstract: Conventional methods of multi-site replication require a data protection appliance (DPA) to split IOs arriving at a volume from a host to a plurality of replica volumes. However, in example embodiments of the present invention, a splitter in the data path may split the IOs to a plurality of replica volumes. In order to create multiple, independent copies of a volume, the splitter will expose the volume to the production site DPA as a plurality of volume instances. Each volume instance may be part of a separate consistency group to be replicated to separate replication sites. Thus, the DPA may attach the splitter to several consistency groups and thus create multiple replicas at one or more replication sites of the same volume.

Abstract: Conventional method of replication do not allow cascaded replication with journaling. However, in example embodiments of the present invention, a splitter in storage or in the data path may split a single volume to multiple DPA targets. The splitter will intercept data arriving to the volume and split the data to another DPA, thereby allowing cascaded replication. In certain embodiments, the DPA may notify the splitter about a point of consistency because the DPA does not distribute IOs with write order fidelity at all times and only some points are write order fidelity consistent. Thus, the DPA may notify the splitter about a consistent point and the splitter will send notifications about the consistent points to the second DPA, allowing the volumes to have consistent points.

Abstract: A system, method, and computer product for enabling a virtual service layer to consume a first storage medium and a second storage medium and map the storage mediums as one or more virtual storage volumes; wherein the one or more virtual volumes are mirrored at a first site and a second site, mirroring of the virtual storage volumes on a distributed mirror, and enabling a distributed replication service to create a continuous data protection image of the data written to one or more virtual storage volumes.

Abstract: In one aspect, a method to replicate a key-value pair includes intercepting a command to update a key-value pair in a key-value pair database, the key-value database comprising metadata of a virtual volume, sending an updated key-value pair to a data protection appliance, receiving an acknowledgement that the data protection appliance received the updated key-value pair and updating the key-value pair in the key-value database after the acknowledgement is received.

Abstract: A system, program product, and computer implemented method for data replication, comprising enabling a virtual service layer to consume a storage medium of a site and map the storage medium of the site as one or more virtual storage volumes, enabling the virtual service layer to present the one or more virtual storage volumes for consumption by a host, enabling a splitter of the site to intercept I/O written to the one or more virtual storage volumes, splitting intercepted I/O to a journal based replication appliance, and enabling the journal based replication appliance to create a continuous data protection image of the data written to one or more virtual storage volumes.

Abstract: Methods and apparatus for a continuous data protection system including replication and journaling, to detect a first problem, react to the first problem, recover from the first problem, determine whether to enter a regulation state due to repetition of the first problem, enter the regulation state, and maintain the regulation state after detecting the first problem again.