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Developer(s)Avishay Traeger
Operating systemLinux
TypeDistributed file system

EXOFS (formerly known as OSDFS) is an object-based file system implemented on top of an external object store. Its name stands for "EXtended Object File System" referring to its use of ext2-based metadata and object storage devices.

Exofs was originally developed by Avishay Traeger for IBM HRL and was originally based on the ext2 file system.[1] Since 2008, Panasas develops and maintains Exofs on open-osd.org.

Exofs has been included in the mainline Linux kernel since version 2.6.30-rc1[2], but no Linux distribution implemented this with a utility for making file systems in exofs for the current kernel line. It was removed in version 5.1-rc1[3].


  1. ^ "exofs (was osdfs) [LWN.net]". Lwn.net. Retrieved 12 November 2018.
  2. ^ "Linux 2.6.30-rc1 [LWN.net]". Lwn.net. Retrieved 12 November 2018.
  3. ^ "remove exofs, the T10 OSD code and block/scsi bidi support V4". Lwn.net. Retrieved 20 March 2019.