Exclusion from release

system is reached or when there are no further valid files on the release candidate list. Files not released remain on the release candidate list.

Figure 27 Reaching the high watermark on an HSM file system

Low watermark

Low watermark is considered during a regular release triggered by reaching the high watermark on the HSM file system. The low watermark is the parameter that defines to what percentage volume the disk space should be freed, and stops the release when it has achieved this level. When it is reached, files that were not released at this point remain online and are kept on the release candidate list.

In certain situations, you may prefer certain files in the HSM file system not to be released, but to remain permanently online. The reasons for this strategy, for example, relate to the types of files you have:

•Certain files or file types of special importance demand instant access. These files must not be released.

•Certain files or file types are accessed so often that repeated releases and recalls would increase their access times and overuse FSE resources. These files can be held permanently online, as long as their total size is not too large.

FSE enables you to define sets of files that are excluded from the release process and kept resident on the HSM file systems. This feature is called exclusion from release and is part of the release policy. It is defined by the value of the ExcludeFromRelease variable in the FSE partition configuration file. Thus, the sets of files to be excluded can be defined separately for each FSE partition.

You can also force the files that are excluded from automatic release to be put offline unconditionally. You achieve this by releasing them manually using the fsefile --releasecommand. Note that using this command on the excluded files does not modify the release policy in any way. After the manually released files are re-migrated or re-recalled, they are still excluded from automatic release.

In the FSE partition configuration template, the ExcludeFromRelease variable is commented out. Thus, no files are excluded from release by default. You can define the files you want to keep permanently online by uncommenting ExcludeFromRelease and specifying appropriate filenames or filename patterns.

HP StorageWorks File System Extender Software user guide 131

File System Extender (FSE) specifications

HP File System Extender (FSE) is a sophisticated solution designed to optimize data storage management for enterprises that deal with large volumes of unstructured data. This technology addresses the challenges of data growth and the need for effective data retention strategies, enabling organizations to store and manage their information more efficiently.

One of the main features of HP FSE is its ability to intelligently migrate data between primary and secondary storage. By utilizing policies that determine when to move infrequently accessed files to lower-cost storage environments, FSE helps reduce the strain on primary storage systems and saves on costs associated with high-performance storage solutions. This tiered approach to data management ensures that organizations can access the data they need quickly while still maintaining an efficient overall storage architecture.

Another notable characteristic of HP FSE is its seamless integration with existing storage infrastructures. The solution works with a variety of storage systems, allowing organizations to utilize their current investments without the need for significant changes to their infrastructure. This interoperability is powered by advanced technologies that facilitate data migration and retrieval, ensuring a smooth transition for organizations looking to optimize their storage strategies.

Additionally, HP FSE is equipped with robust reporting and analytics capabilities. This functionality provides organizations with insights into their storage usage, helping them understand data patterns and optimize their storage environments accordingly. By having visibility into which files are accessed most frequently and which are rarely used, organizations can make informed decisions on data retention policies and storage management.

Security is paramount in data management, and HP FSE addresses this concern by implementing advanced data protection features. This includes data encryption, secure access controls, and compliance with industry regulations, ensuring that sensitive information is safeguarded throughout its lifecycle.

Overall, HP File System Extender is a comprehensive data storage solution that combines intelligent data management, seamless integration, insightful analytics, and robust security features. By leveraging these capabilities, organizations can efficiently manage their unstructured data, lower costs, and enhance operational efficiency, making it an invaluable tool in today’s data-driven landscape.

HP File System Extender (FSE) manual Exclusion from release, Low watermark

Models: File System Extender (FSE)

Figure 27 Reaching the high watermark on an HSM file system

Low watermark