AdvFS is an open source file system developed in the early to mid 1990s by Digital Equipment Corporation for their OSF/1 version of the Unix operating system (later Digital UNIX/Tru64 UNIX). For other uses, see Software developer (disambiguation). ... Digital Equipment Corporation was a pioneering American company in the computer industry. ... In computer engineering, hard disk drive partitioning is the creation of logical divisions upon a hard disk that allows one to apply operating system-specific logical formatting. ... A tebibyte is a unit of information or computer storage, commonly abbreviated TiB. 1 tebibyte = 240 bytes = 1,099,511,627,776 bytes The tebibyte is closely related to the terabyte, which can either be a synonym for tebibyte, or refer to 1012 bytes = 1,000,000,000,000 bytes... A tebibyte is a unit of information or computer storage, commonly abbreviated TiB. 1 tebibyte = 240 bytes = 1,099,511,627,776 bytes The tebibyte is closely related to the terabyte, which can either be a synonym for tebibyte, or refer to 1012 bytes = 1,000,000,000,000 bytes... In computer file systems, a fork is additional data associated with a file system object. ... Most modern file systems have methods of administering permissions or access rights to specific users and groups of users. ... Filesystem-level encryption, is a form of disk encryption where individual files or directories are encrypted by the file system, in contrast to full disk encryption where the entire partition or disk, where the file system resides, is encrypted. ... An operating system (OS) is a software that manages computer resources and provides programmers with an interface used to access those resources. ... Tru64 is HPs (formerly Compaq; formerly DEC) 64-bit UNIX for the Alpha AXP platform. ... Open source refers to projects that are open to the public and which draw on other projects that are freely available to the general public. ... For library and office filing systems, see Library classification. ... Digital Equipment Corporation was a pioneering American company in the computer industry. ... Filiation of Unix and Unix-like systems Unix (officially trademarked as UNIX®, sometimes also written as or ® with small caps) is a computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie and Douglas McIlroy. ... Tru64 is HPs (formerly Compaq; formerly DEC) 64-bit UNIX for the Alpha AXP platform. ... Tru64 UNIX is HPs (formerly Compaq; formerly DEC) 64-bit Unix operating system for the DEC Alpha AXP platform. ...

Its features include:

• a journal to allow for fast crash recovery
• high performance
• dynamic structure that allows an administrator to manage the file system on the fly
• on the fly creation of snapshots
• defragmentation while the domain had active users

AdvFS used a relatively advanced concept of storage pool (called file domain) and logical file systems (called file sets). A file domain was composed of any number of block devices, which could be partitions, LVM or LSM devices. A file set was a logical file system created in one file domain. Administrator can add or remove volumes from an active file domain, providing that there is enough space on the remaining file domain, in case of removal. A journaling (or journalling) file system is a file system that logs changes to a journal (usually a circular log in a specially-allocated area) before actually writing them to the main file system. ... In relation to computer technology, on the fly describes activities that develop or occur dynamically rather than as the result of something that is statically predefined. ... LVM can stand for: Logical volume management, a method of transparently storing computer data spread over several partitions Logical Volume Manager, an implementation of logical volume management in the Linux kernel Ludwig von Mises Institute, a paleolibertarian academic organisation Local vibrational mode, a type of vibrational mode Category: ... Look up the abbreviation LSM in Wiktionary LSM is a three letter abbreviation that may refer to: Landing Ship, Medium, a form of amphibious assault ship Laser Scanning Microscopy (see Confocal laser scanning microscopy), a type of microscopy in which laser light is used for illumination Layered synthetic microstructure, a...

File sets can be balanced - file content of file sets be balanced across physical volumes. Particular files in a file set could be striped across available volumes.

Administrator can take a snapshot of any active or inactive file set. Snapshots were called clones. This allowed for easy on-line backups.

Another feature allowed administrators to add or remove block devices from a file domain, while the file domain had active users. This add/remove feature allowed migration to larger devices or migration from potentially failing hardware without a system shutdown.

Most of the advanced features required a special license.

Historically, AdvFS was developed for another operating system and ported to DEC OSF/1 by DEC engineers in Bellevue, WA. Over time, development moved to teams located in Bellevue, WA and Nashua, NH. Version were 1 version behind the OS version. Thus, DEC OSF/1 v3.2 had AdvFS v2.x, Digital UNIX 4.0 had AdvFS v3.x and Tru64 UNIX 5.x had AdvFS v4.x. It is generally considered that only v4 had matured to production level stability, with sufficient set of tools to get administrator out of any kind of trouble. Bellevue is a city located in King County, Washington. ... Nashua is a city located in Hillsborough County, New Hampshire. ...

On June 22, 2008 its source code was released under GNU General Public License at SourceForge in order to be compatible with the Linux kernel licence as stated in the webpage. In addition, anyone should be able to port it to the Linux kernel and get it into mainline. GPL redirects here. ... SourceForge is a collaborative revision control and software development management system. ...

External links

• Source code
• Press release concerning the release of the AdvFS source code