IMPORTANT: FSE includes the utility HSM Health Monitor, which helps preventing file systems for FSE databases and system files and HSM file systems from running out of free space. For details, see the FSE user guide, chapter ”Monitoring and maintaining FSE”, section ”Low storage space detection”.

Formula for the expected HSM file system size

Use this simplified formula to calculate the minimum HSM file system size:

125 ⋅ [(afs ⋅ nf ⋅ pon) + (bks ⋅ 2 ⋅ nf)] minHSMFSsize = --------------------------------------------------------------------------------------------------

100

The parameters have the following meaning:

minHSMFSsize ..... the minimum required HSM file-system size in bytes.

afs ..... the average file size in bytes.

nf ..... the expected number of files on an HSM file system.

pon ..... the percentage of online files (%).

bks ..... the file-system block size in bytes.

Formula for the expected size of Fast Recovery Information

Fast Recovery Information (FRI) consists of a set of files, each corresponding to a single open data volume on a configured FSE medium, which grows in size as the percentage of used space on the volume increases. FRI files reach maximum size when the corresponding data volume becomes full. The FRI files are then copied to appropriate locations on the FSE medium and removed from disk.

Use this formula to calculate the expected maximum size of FRI files on disk:

nv ⋅ sv ⋅ [(lf + 350) ⋅ nm ⁄ tbks] maxFRIsize = -------------------------------------------------------------------------------

 

 

[sf ⋅ nm ⁄ tbks]

where the meaning of the parameters is:

maxFRIsize

the estimated maximum size of FRI files on disk in bytes.

nv

the total number of open FSE medium volumes1 in the FSE implementation.

sv

the size of an FSE medium volume on tape in bytes.

lf

the average file name length of files being migrated in bytes.

nm

the average number of files migrated together in the same migration job.

tbks

the block size on an FSE medium2 in bytes.

sf

the average size of files being migrated in bytes.

[...]

square brackets indicate that the value inside is rounded up to an integer.

1.Normally, the number of configured FSE media pools containing media with migrated files.

2.Assuming all FSE media pools are configured with the same block size (block size is uniform on all FSE media).

Formula for the expected File System Catalog size

The File System Catalog (FSC) is a database that consists of the Data Location Catalog (DLC) and the Name Space Catalog (NSC). The DLC records the full history of file locations on FSE media. The NSC contains metadata of files on an HSM file system.

Factors used for FSC size estimation:

•Approximate usage 180 bytes per file for FSC (DLC + NSC) for typical file generation with two copies and file name size of 16 characters using standard file attributes (Linux). You need to add the size of additional attributes on Windows - access control lists (ACLs), extended attributes (EAs) and alternate data streams (ADSs).

•Additional 36 bytes for media volume index for each file copy is required when you run FSC consistency check. This will be used on the first run of consistency check.

HP StorageWorks File System Extender Software installation guide for Linux 15

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HP File System Extender (FSE) manual Formula for the expected HSM file system size
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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.
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