Qnap Snapshot Agent Fix Download
Clarissa Pfister
The Volume Shadow Copy Service (VSS) is a set of COM interfaces that implements a framework to allow volume backups to be performed while applications on a system continue to write to the volumes. It was first introduced in Windows Server 2003 and offered view, clone and restore features for consistent shadow copies (also known as a snapshot or a point-in-time copy).
The following diagram shows the components of Volume Shadow Copy Service (VSS), and the actions required to create a consistent shadow copy (also known as a snapshot or a point-in-time copy) of the data that is to be backed up.
We have learned from previous sections that creating application-consistent snapshots is easy with the QNAP Snapshot Agent and VSS Hardware Provider. Additionally, the underlying network architecture for interconnecting the storage array (ES NAS) and the application server is not hard to implement. All of the components (i.e. VSS Service, Requestor, Provider, and QNAP Snapshot Agent) can be installed on the same server on which the VSS-aware applications reside.
Before taking an iSCSN LUN snapshot, please make sure that an iSCSI LUN has been created on the NAS. And the iSCSI LUN has been connected and used by the Windows Server. In our demonstration, we also created 6 VMs on the Windows server using Hyper-V Manager.
NetBak replicator is a free and easy-to-use backup program that supports VSS. With QNAP NetBak replicator, you can back up transactional-based applications such as databases and virtual machines. VSS can facilitate creating backup files with a consistent view and without data corruption. When you conduct a backup job for an iSCSI LUN from the Windows Server with backup software that supports VSS, the VSS Hardware Provider will use NAS ROW (Redirect on Write) instead of Windows COW (Copy on Write) to take snapshots on the Windows Server and therefore increase the backup efficiency. The first step to use VSS hardware provider function is to configure your backup software to enable VSS as described in the following sections.
Thanks to the intuitive user interface of QTS 4.2, your NAS experience is smarter, smoother and spectacular. Its modern flat design streamlines loading times, and the intelligent desktop allows you to quickly find desired functions, create desktop shortcuts or group shortcuts, monitor important system information on a real-time basis, and open multiple application windows to run multiple tasks concurrently, bringing greater operating efficiency. QTS breaks the barriers of devices, platforms and geography to bring optimized cloud experiences to you, and incorporates more advanced features including volume/LUN snapshot, remote connection to public cloud services in File Station, multi-zone multimedia system, and more.
The Virtualization Station transforms the TS-251+ into a 2-in-a-box NAS that can function as an all-in-one NAS and a virtualization platform that supports multiple operating systems, fast VM creation, VM backup & restoration, VM import/export, snapshot, Device Management for centrally managing VM, and enables desktop operations on web browsers. With the easy-to-use interface, you can centrally manage all of the VMs created on the TS-251+ with minimal effort. You can also download VMs on demand from online VM markets and import them to the TS-251+ without any complex procedures.
Not limited to high-end models, the TS-251+ brings the highly-anticipated snapshot function for your flexible usage. QTS Storage Manager adds an easy-to-use web-based snapshot tool for you to easily back up and restore data on the TS-251+ back to any point of time to prevent loss of important data. You can take up to 256 snapshots for both volumes and LUN, efficiently replicate volume/LUN snapshots to remote servers by copying only the changes made, and quickly clone a volume /LUN snapshot as a local volume without interrupting the current system operation. You can even set up the system to automatically take a snapshot of the volume before backup via RTRR/rsync, even when the file is opened.
In QTS 4.2, the Storage Manager's Snapshot function supports iSCSI LUNs to rapidly back up and restore data. When creating a LUN snapshot, QNAP Snapshot Agent for Windows Server or VMware vCenter allows the NAS to communicate with the remote server when taking snapshots and ensures Application-consistent LUN snapshots.
VSS Hardware Provider also allows NAS ROW (Redirect on Write) instead of Windows COW (Copy on Write) to increase backup efficiency and to offload the snapshot to the NAS for reducing the performance impact on the Windows server.
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