FedFsGlossary
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=== Globally Useful Name === | === Globally Useful Name === | ||
| - | + | A Globally Useful Name is a pathname in the FedFS domain namespace which is the same no matter which client is used to access the file. | |
=== Junction === | === Junction === | ||
Revision as of 23:51, 17 October 2012
Contents |
Project: fedfs-utils
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Introduction
This article contains a glossary of terms related to FedFS.
Glossary
Domain Root Directory
A domain root directory is the top-level directory of a FedFS domain.
FedFS
FedFS is short for Federated File System. It's a set of administrative protocols and techniques for creating a file name space that can cross multiple shares on multiple file servers, and is consistent no matter which client it is accessed from.
FedFS Domain
A FedFS domain is a file name space that can cross multiple shares on multiple file servers. A FedFS domain is typically a single administrative entity, and has a name that is similar to a DNS domain name.
File-access client
A file-access client accessed data stored on fileservers via a standard file-access protocol such as SMB or NFS.
Fileserver
A fileserver provides access to file storage via a standard file-access protocol such as NFS or SMB.
Fileset
A fileset is a collection of files and directories that are considered as a single administrative unit in a FedFS domain. Each fileset may reside at a single location, or it may be replicated to several locations.
Globally Useful Name
A Globally Useful Name is a pathname in the FedFS domain namespace which is the same no matter which client is used to access the file.
Junction
A junction is a link between two shared file systems. The two shared file systems may not reside on the same server. There may be more than one replica of the linked-to shared file system, stored on several different file servers. Junctions store a list of locations.
Currently there are two types of junctions:
- An NFS basic junction stores location information directly in each junction
- A FedFS junction stores location information on an LDAP server so it can be shared
Junction Resolution
The process where a file server converts the contents of a junction to a list of locations that can be used to respond to a client during a referral event.
Location
Each replica of the linked-to file system is called a fileset location, or location, for short. A location is represented as an export path paired with a server name or IP address.
Namespace Database
A Namespace Database, also known as an NSDB, is the central repository of FedFS domain namespace information that is shared among all file servers in a FedFS domain. It is accessed via the LDAP protocol.
Referral
A referral event occurs when a file server reports to a client that the object (typically a directory) the client is attempting to access has moved. The client responds by requesting a list of locations where it can find the object.
