Episode filesystem

Episode

Developer(s)	Transarc
Full name	Episode
Introduced	1992; 32 years ago (1992)
Structures
Directory contents	8KB blocks with hash table
File allocation	inode-based
Limits
Max filename length	256 bytes
Features
Forks	No
Attributes	POSIX
File system permissions	POSIX ACLs
Transparent compression	No
Transparent encryption	No
Other
Supported operating systems	AIX, Solaris, z/OS

Episode is a POSIX compliant file system most commonly known for its use in DCE/DFS file servers. It was designed to achieve the goals of portability, scaling, and to make more efficient use of available system bandwidth. It used a variety of methods to achieve these goals, one of which was its use of metadata logging, designed to enhance the file system's performance.

The Episode file system is the basis for the IBM z/OS POSIX-compatible file system called zFS.^[1]

References

1. Rogers, Paul; Conway, Richard. "ABCs of z/OS System Programming: Volume 9" (PDF). Redbooks. IBM. Retrieved 1 May 2022.

External links

• The Episode File System (USENIX Paper)