XFS is a 64-bit, high-performance journaling file system with guaranteed filesystem consistency created by Silicon Graphics, Inc. It was the default file system in IRIX releases 5.3 and onwards and later ported to the Linux kernel.
XFS combines advanced journaling technology with full 64-bit addressing and scalable structures and algorithms.
XFS has been maintained in the official Linux kernel kernel trees starting with Linux 2.4. All modern Linux distributions include support for XFS.
- Quick Recovery – restarts very quickly after an unexpected interruption, regardless of the number of files it is managing.
- Fast Transactions – provides the advantages of journaling while minimizing the performance impact of journaling on read and write data transactions.
- Massive scalability – supports a maximum file system size of 8 exbibytes minus one.
- Efficient Allocations – implements extremely sophisticated space management technique.
- Excellent Bandwidth – capable of delivering very close to the raw I/O performance that the underlying hardware can provide.
- Provides journaling for file system metadata, where file system updates are first written to a serial journal before the actual disk blocks are updated.
- Supports filesystem growth for mounted volumes, allows filesystem “freeze” and “thaw” operations to support volume level snapshots, and provides an online file defragmentation utility.
- Implements fully journaled extended attributes.
- Supports the ACL semantics and interfaces described in the draft POSIX 1003.1e standard.
- NFS Compatibility.
- Uses the Open Source Samba server to export XFS filesystems to Microsoft Windows systems.
- Data Management API (DMAPI/XDSM) allows implementation of hierarchical storage management software with no kernel modifications.
- Supports the notion of a “realtime subvolume” – a separate area of disk space where only file data is stored.
Developer: Silicon Graphics Inc.
License: GNU GPL v2
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