Tandberg DataShadow Copy Service

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4.2.4.Determining Creation Frequency

The more frequently shadow copies are created, the more likely that end users will get the version that they want. However, with a maximum of 64 shadow copies per volume, there is a trade-off between the frequency of making shadow copies and the amount of time that the earlier files will be available.

By default, the NAS appliance will create shadow copies at 0700 and 1200, Monday through Friday when the feature is enabled for a volume. However, these settings are easily modified by the administrator so that the shadow copy schedule can better accommodate end user needs. To modify these schedules see the section on “Shadow Copy Schedules” documented later in this chapter.

Note

The more shadow copies are created, the more disk space the shadow copies can consume, especially if files change frequently.

4.2.4.Shadow Copies & Disk Defragmentation

When running Disk Defragmenter on a volume with shadow copies activated, all or some of the shadow copies may be lost, starting with the oldest shadow copies.

If defragmenting volumes on which shadow copies are enabled, use a cluster (or allocation unit) size of 16 KB or larger. Utilizing this allocation unit size reduces the number of copy outs occurring on the snapshot. Otherwise the number of changes caused by the defragmentation process can cause shadow copies to be deleted faster than expected. Note, however, that NTFS compression is supported only if the cluster size is 4 KB or smaller.

Note

To check the cluster size of a volume, use the following text-mode command:

C:\>fsutil fsinfo ntfsinfo <volume pathname or drive letter>

To change the cluster size on a volume that contains data, backup the data on the volume, reformat it using the new cluster size, and then restore the data.

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Tandberg Viking Series Storage Server Administration Manual

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Tandberg Data Viking FS-1500, Viking FS-1600 manual Determining Creation Frequency, Shadow Copies & Disk Defragmentation
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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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