File systems; File servers

Full Title

Information retrieval; Database structures therefor; File system structures therefor > File systems; File servers

Classification Context

Section:

PHYSICS

Class:

COMPUTING OR CALCULATING; COUNTING

Subclass:

ELECTRIC DIGITAL DATA PROCESSING

Scope Notes

Glossary: data backup a copy of data created by replicating persistent data from a given storage medium (not from a volatile memory) at a particular point in time for the purpose of potentially later recovering said data in the state it was at said particular point in time. The recovery can either occur through restoration of said replicated data onto a storage medium or memory, or by using the memory/medium onto which the copy was created. A backup of data is typically used to at least partially correct or restore lost or corrupted data, although it is accepted that the restored state usually is not identical to the state when the data loss occurred, i.e. some data may be unrecoverable. file files abstract data container used in file systems to manage a set of data. The internal structure of a file is normally not known by the file system, i.e. the file is opaque from the viewpoint of the file system. The internal structure and size of a file is defined by the application generating and using the file but is independent of the underlying physical storage system used to store the file. file system file systems a file system (or filesystem) is a means to organise data expected to be retained after a program terminates by providing procedures to store, retrieve and update data. hierarchical storage management (HSM) hierarchical storage management HSM a particular case of data migration wherein the target medium is lower in a hierarchical storage system, and is used for less frequently used data or for data that is no longer actively used. The target medium is suitable for longer term storage, is slower and has lower cost per unit of data. In contrast to backup, HSM systems do not provide an additional instance of the data. data migration moving data from one memory or storage medium to another without effectively replicating it since ultimately only one copy persists. Examples: transferring data from a disk to another one having different reliability, performance or cost properties. data replication the act of creating several instances of the same data of which at least two are available in the absence of errors and modifications of the original data. The different instances may be stored on different locations of a given storage medium or memory or they may be stored on physically distinct media or memories. The concept of replication is independent of the purpose it is used for. E.g. replication may be used for potential restoration of data, for load balancing and performance improvement, for fault tolerance, or for increasing the availability of data, etc. Data replication can occur at different levels of abstraction, e.g. at database level, at file system level, at the level of disk/storage I/O operations or at the level of (main) memory pages or even individual memory write instructions

Child Classifications

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• G06F 16/11 File system administration, e.g. details of archiving or snapshots
• G06F 16/13 File access structures, e.g. distributed indices
• G06F 16/14 Details of searching files based on file metadata
• G06F 16/16 File or folder operations, e.g. details of user interfaces specifically adapted to file systems
• G06F 16/17 Details of further file system functions
• G06F 16/18 File system types