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Shadow Copy (also known as Volume Snapshot Service, [1] Volume Shadow Copy Service [2] or VSS [2]) is a technology included in Microsoft Windows that can create backup copies or snapshots of computer files or volumes, even when they are in use. It is implemented as a Windows service called the Volume Shadow Copy service.
Copy-on-write (COW), also called implicit sharing [1] or shadowing, [2] is a resource-management technique [3] used in programming to manage shared data efficiently. Instead of copying data right away when multiple programs use it, the same data is shared between programs until one tries to modify it.
The software provides a number of data recovery options, [26] including: Entire VM recovery: An immediate restore of a VM via mounting a VM image to a host directly from a backup file (Instant VM Recovery) Full extraction of a VM image from a backup; File-level recovery: Restore specific VM files such as virtual disks, configuration files, etc.
To avoid downtime, high-availability systems may instead perform the backup on a snapshot—a read-only copy of the data set frozen at a point in time—and allow applications to continue writing to their data. Most snapshot implementations are efficient and can create snapshots in O(1). In other words, the time and I/O needed to create the ...
Snapshots form the basis for NetApp's asynchronous disk-to-disk replication (D2D) technology, SnapMirror, which effectively replicates Flexible Volume snapshots between any two ONTAP systems. SnapMirror is also supported from ONTAP to Cloud Backup and from SolidFire to ONTAP systems as part of NetApp's Data Fabric vision. NetApp also offers a ...
However, ReFS lacked copy-on-write snapshots and compression, both found in Btrfs and ZFS. In 2014, BetaNews wrote a review of ReFS and assessed its readiness for production use. [ 27 ] The review concluded that ReFS had at least some advantages over two of its main file system competitors.
VMware LLC is an American cloud computing and virtualization technology company headquartered in Palo Alto, California. [2] VMware was the first commercially successful company to virtualize the x86 architecture. [3] VMware's desktop software runs on Microsoft Windows, Linux, and macOS.
Windows Azure Storage Blobs (WASB) file system: This is an extension of HDFS that allows distributions of Hadoop to access data in Azure blob stores without moving the data permanently into the cluster. A number of third-party file system bridges have also been written, none of which are currently in Hadoop distributions.