HSM file system recovery

3.Enable the FSE partition.

4.Start the recovery of FSC:

fserecover --fsc PartitionName

For example, to start recovery of the File System Catalog for FSE partition fse_fs01 enter:

fserecover --fsc fse_fs01

When running the fserecover --fsccommand the following occurs:

1.If FRI is located on disk, which is the case for all data volumes that are not yet full, recovery is done from these temporary FRI files.

2.If a data volume on a partitioned FSE medium is full and its FRI has been written to the system volume on the medium, the recovery is done from FRI on the system volume. This is the fastest method since all FRI is located on the system volume.

3.If an FSE medium is not partitioned to have a system volume, the recovery is done from FRI on the data volume, since each data volume includes its own FRI.

The FRI on the data volume is also used if the FRI on the system volume is invalid.

4.If FRI is not available, the recovery process needs to recreate it from file data on the data volume. This is a time-consuming process since all data need to be read first, and only then can FRI be recreated and used to recover FSC.

Once FSC recovery is completed, you should run the FSC consistency check as described in ”Consistency check of FSC vs. HSM file system” on page 178.

HSM file system recovery is necessary in case HSM file system is damaged or corrupted

An HSM file system is recovered directly from the belonging Name Space Catalog (NSC), which is a part of the File System Catalog. Since the Name Space Catalog contains complete information about the file system structure (such as the directory structure, file attributes, and security information), the entire HSM file system structure can be recreated.

Limitations

•Recovery cannot properly handle user changes on an HSM file system that occurred after the last migration is finished. To prevent this situation, you need to format the HSM file system.

•Symbolic links cannot be recovered because they are not migrated to FSE media.

•Recovery of Windows Alternate Data Streams (ADS) data is not supported, except for the names of ADS, which are stored in NSC.

Prerequisite

•The Name Space Catalog (NSC) of the FSE partition whose HSM file system will be recovered must exist.

Name Space Catalog (NSC) was introduced in the FSE release 2.1 and should have been created during upgrade of the FSE software to that FSE release.

The HSM file system recovery procedure

Linux specific

To recover an HSM file system on a Linux FSE client:

1.From the local /etc/fstab file, determine the device (block special device node) of the HSM file system, and run the following command:

#umount Device

2.Format the HSM file system using the mkfs.ext3 command. For more information, see the FSE installation guide for Linux, chapter ”Preparing file systems for FSE”, section ”Creating file systems on top of LVM logical volumes”.

236 Backup, restore, and recovery

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 HSM file system recovery, Prerequisite

Models: File System Extender (FSE)

3.Enable the FSE partition.

4.Start the recovery of FSC: