A New Internet-Draft is available from the on-line Internet-Drafts
directories.
Title : Pairtrees for Object Storage (V0.1)
Author(s) : J. Kunze, M. Haye, E. Hetzner, M. Reyes
Filename : draft-kunze-pairtree-00.txt
Pages : 15
Date : 2008-6-17
This document specifies Pairtree, a filesystem hierarchy for holding
objects that are located by mapping identifier strings to object
directory (or folder) paths two characters at a time. If an object
directory (folder) holds all the files, and nothing but the files,
that comprise the object, a "pairtree" can be imported by a system
that knows nothing about the nature or structure of the objects but
can still deliver any object's files by requested identifier. The
mapping is reversible, so the importing system can also walk the
pairtree and reliably enumerate all the contained object identifiers.
To the extent that object dependencies are stored inside the pairtree
(e.g., fast indexes stored outside contain only derivative data),
simple or complex collections built on top of pairtrees can recover
from index failures and reconstruct a collection view simply by
walking the trees. Pairtrees have the advantage that many object
operations, including backup and restore, can be performed with
native operating system tools.
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