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4. Volume Shadow Copy

Service(VSS)

4.1.Volume Shadow Copy Service Overview

The Volume Shadow Copy Service provides an infrastructure for creating point-in-time snapshots (shadow copies) of volumes. Shadow Copy supports 64 shadow copies per volume under Windows® Storage Server 2003 environment.

A shadow copy contains previous versions of the files or folders contained on a volume at a specific point in time. While the Shadow Copy mechanism is managed at the Viking Series NAS appliance (see the “Managing Shadow Copy” section in this chapter), previous versions of files and folders are only available over the network from clients and are seen on a per folder or file level and not as an entire volume.

The Shadow Copy feature works at the block level. As changes are made to the file system, the Shadow Copy Service copies out the original blocks to a special cache file, to maintain a consistent view of the file at a particular point in time. Since the snapshot only contains a subset of the original blocks, the cache file is typically smaller than the original volume. In the snapshot’s original form, it takes up no space since blocks are not moved until an update to the disk occurs.

By using shadow copies, the NAS appliance can maintain a set of previous versions of all files on the selected volumes. End users access the file or folder by using a separate client add-on program, which enables them to view the file in Windows Explorer. Accessing previous versions of files, or shadow copies, enables users to:

•Recover files that were accidentally deleted. Previous versions can be opened and copied to a safe location.

•Recover from accidentally overwriting a file. A previous version of that file can be accessed.

•Compare several versions of a file while working. Use previous versions to compare changes between two versions of a file.

Shadow copies cannot replace the current backup, archive, or business recovery system, but they can help to simplify restore procedures. Since a snapshot only contains a portion of the original data blocks, shadow copies can not protect against data loss due to media failures. However the strength of snapshots is the ability to instantly recover data from shadow copies, reducing the number of times needed to restore data from tape.

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Tandberg Viking Series Storage Server Administration Manual

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Tandberg Data Viking FS-1600, Viking FS-1500, Viking FS-412 manual Volume Shadow Copy ServiceVSS
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Viking FS-1500, Viking FS-1600, Viking FS-412 specifications

Tandberg Data, a renowned name in the data storage industry, has provided advanced storage solutions that cater to the needs of businesses requiring reliable and efficient data management. Among their notable products are the Viking FS-412, Viking FS-1500, and Viking FS-1600 tape libraries. These devices exemplify Tandberg's commitment to providing high-performance, scalable, and secure data storage solutions.

The Tandberg Viking FS-412 is designed for small to medium-sized businesses that need a compact yet efficient storage solution. With a capacity to hold up to 12 tape cartridges, the FS-412 supports both LTO (Linear Tape-Open) and DAT (Digital Audio Tape) technologies. This versatility allows users to select the most appropriate media based on their data backup needs. Its compact design ensures that it can easily fit into standard server racks, making it a practical choice for environments where space is limited. Additionally, the FS-412 features an automated loading mechanism that simplifies the backup process and increases efficiency.

Moving up in capacity, the Viking FS-1500 offers enhanced features suitable for medium to large-sized enterprises. With the ability to accommodate up to 15 tape cartridges, it significantly increases storage capacity while maintaining a user-friendly interface. It supports multiple generations of LTO technology, allowing for backward compatibility, ensuring that businesses can utilize existing tapes while scaling their storage capabilities. The FS-1500’s high-speed data transfer rates minimize backup windows, helping organizations meet stringent data protection regulations.

The Viking FS-1600 provides even greater scalability and is tailored for larger data centers. Featuring a higher capacity of up to 24 tape cartridges, it supports a wide range of LTO technology versions, providing flexibility for evolving data demands. Users can benefit from features such as advanced robotics for improved tape loading efficiency and redundant power supplies for enhanced reliability. Additionally, the FS-1600 is designed with modularity in mind, allowing for easy expansion as data storage needs grow.

All three Tandberg Viking tape libraries employ intelligent management software that facilitates seamless integration with various backup applications. This software aids in monitoring, reporting, and managing the lifecycle of cartridges, ensuring optimal efficiency and reliability. With a focus on long-term data preservation, the Viking range from Tandberg Data assures organizations that their valuable data is secure and readily accessible when needed. Overall, the Viking FS-412, FS-1500, and FS-1600 stand out as exemplary solutions for businesses looking to enhance their data backup and storage strategies.
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