Abstract:
A computer readable medium and method providing checkpointing to Windows application groups, the computer readable medium having computer-executable instructions for execution by a processing system. The computer-executable instructions may be for launching an application and creating one or more application threads, receiving a checkpoint signal by an application thread, and entering a checkpoint Asynchronous Procedure Call (APC) handler at IRQL APC_LEVEL, the APC handler disposed in a kernel module, acquiring an ETHREAD block and user-mode context for the application thread, and examining an execution state of the one or more application threads at a time of the checkpoint signal.
Abstract:
Disclosed is a method, a system and a serving node for data backup and restoration, in which a serving node generates a backup schedule after receiving a data backup request, uploads the schedule to a cluster public storage block, each serving node sends a copy to be backed up to a target node for consolidation; a client sends a data record in a consolidated copy to the serving node through a data writing request, generates a data distribution table according to a load balancing principle, sends the request to other serving nodes according to the table to perform a write operation, the client sends the data writing request for a next data record after the write operation, until the copy is completely restored. The backup and restoration is performed in a complex cluster network accounting for performance differences among serving nodes, data consistency, data integrity and data uniform distribution.
Abstract:
Systems and methods for, among other things, updating a destination data set of hierarchical data in relation to a source set of hierarchical data. The method, in certain embodiments, includes receiving an indication that the source data set has one or more changes, initiating a comparison between the source data set and the destination data set, identifying differences and related hierarchical relationships, and altering the destination data set by performing changes in an order that preserves the hierarchical relationships. The method may use the change notifications as an indicator to start the comparison and restart the comparison upon the receipt of a new notification. By using this method, the two data sets can be kept synchronized while preserving hierarchical relationships between the data elements in an environment where the source data set experiences unpredictable changes and cannot be locked.
Abstract:
A system and method for verifying consistency of data in a recovery system, the method including: protecting data in the recovery system, the recovery system includes a target disk configured to store a replica of a protected storage system from before a time window and a journal including data and metadata of write operations to the protected storage system that occurred during the time window; verifying consistency of the replicated data, concurrently with the protecting by: copying data of a selected chunk of the protected storage system at a specified time point, while monitoring write operations to the protected system; generating a replica of the selected chunk in the recovery system from the target disk and the journal, from the specified time point; comparing the copied data of the selected chunk with the replica of the selected chunk and repeating the copying, generating and comparing for a plurality of chunks.
Abstract:
Provided are a method for synchronization of UGC master and backup data and a system there of, and a computer storage medium. The method includes the steps of: determining, when performing data synchronization of a master storage site and a backup site of UGC data, whether a version identifier stored satisfies a predetermined full synchronization condition, the version identifier corresponding to UGC data update of each user identifier in the master storage site; acquiring, when it is determined that the version identifier stored satisfies the predetermined full synchronization condition, from the master storage site full amount of UGC data corresponding to the user identifier, and synchronizing the UGC data to the backup site; otherwise, acquiring from the master storage site the UGC update data corresponding to the user identifier, and synchronizing the UGC update data to the backup site. By the method and system, synchronization consistency of the UGC master and backup data is realized, and the synchronization data will not occupy excessive communication resources; thereby the influence of UGC data expansion on the synchronization efficiency is relatively low.
Abstract:
Disclosed is an approach for implementing disaster recovery for virtual machines. Consistency groups are implemented for virtual machines, where the consistency group link together two or more VMs. The consistency group includes any set of VMs which need to be managed on a consistent basis in the event of a disaster recovery scenario.
Abstract:
In one embodiment, a node of a cluster is coupled to a storage array of storage devices. The node executes a storage input/output (I/O) stack having a redundant array of independent disks (RAID) layer that organizes the storage devices within the storage array as a plurality of RAID groups. Configuration information is stored as a cluster database. The configuration information identifies the RAID groups associated with the storage devices. Each RAID group is associated with a plurality of segments and each segment has a different RAID configuration.
Abstract:
A storage control system adapted to operate as a remote copy pair by communicating between a primary and a secondary of the remote copy pair comprises a selector for selecting writes to be placed in a batch based on one or more criteria, a sequence number requester for requesting a sequence number for the batch, and a sequence number granter for granting a sequence number for the batch. The storage control system also comprises a batch transmitter for transmitting the batch to the secondary, a permission receiver for receiving a permission to write the batch from the secondary, and a write component responsive to the permission receiver to write the batch to completion, wherein the secondary is responsive to the completion to grant a further permission to write for a further batch.
Abstract:
Examples maintain consistency of writes for a plurality of VMs during live migration of the plurality from a source host to a destination host. The disclosure intercepts I/O writes to a migrated VM at a destination host and mirrors the I/O writes back to the source host. This “reverse replication” ensures that the CG of the source host is up to date, and that the source host is safe to fail back to if the migration fails.
Abstract:
Examples perform live migration of VMs from a source host to a destination host using destructive consistency breaking operations. The disclosure makes a record of a consistency group of VMs on storage at a source host as a fail-back in the event of failure. The source VMs are live migrated to the destination host, disregarding consistency during live migration, and potentially violating the recovery point objective. After live migration of all of the source VMs, consistency is automatically restored at the destination host and the live migration is declared a success.