disk file system

There are different architectural approaches to a shared disk file system.

The shared disk file system allows multiple computers to access the same volume at block level.

While disk file systems attempt to keep individual files contiguous, this is not often possible without significant performance penalties.

Some early operating systems were capable of handling only tape and disk file systems.

Shared disk file system, a different approach, also known as cluster file system.

A shared disk file system can also be run on top of a SAN to provide filesystem services.

In a disk file system there is typically a master file directory, and a map of used and free data regions.

Random access: Disk file systems are optimized to avoid disk seeks whenever possible, due to the high cost of seeking.

Shared disk file systems allow multiple machines to use a single hard disk safely by coordinating simultaneous access to individual files.

An alternative approach is a shared disk file system, where each computer has access to the "native" filesystem on a shared disk drive.

Shared disk file systems also usually employ some sort of a fencing mechanism to prevent data corruption in case of node failures.

A disk file system takes advantages of the ability of disk storage media to randomly address data in a short amount of time.

Melio FS - a shared disk file system for Windows from Sanbolic.

Some disk file systems are journaling file systems or versioning file systems.

A shared disk file system uses a storage area network (SAN) to provide direct disk access from multiple computers at the block level.

Shared disk file systems are normally used in a high-availability cluster together with storage on hardware RAID.

A similar construction is a RAM disk, which appears as a virtual disk drive and hosts a disk file system.

Nasan (also known as SAN-FS) is a shared disk file system created by the company DataPlow.

Fencing is typically done automatically, by cluster infrastructure such as shared disk file systems, in order to protect processes from other active nodes modifying the resources during node failures.

In computing, the Global File System 2 or GFS2 is a shared disk file system for Linux computer clusters.

A shared disk file system is one in which a number of machines (usually servers) all have access to the same external disk subsystem (usually a SAN).

OCFS2 - Oracle Cluster File System - a shared disk file system for Linux.

However, file systems built on top of SANs do provide file-level access, and are known as SAN filesystems or shared disk file systems.

In a traditional Unix disk file system, an inode data structure contains basic information about each file, such as where the data contained in the file is stored.

StorNext File System (SNFS) is a shared disk file system made by Quantum Corporation.