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USENIX Technical Program - Abstract - USENIX Annual
Conference, Freenix Session - June 2000
DMFS - A Data Migration File System for NetBSD
William Studenmund, Veridian MRJ Technology Solutions
Abstract
I have recently developed DMFS, a Data Migration File System, for
NetBSD[1]. This file system provides kernel support for the data
migration system being developed by my research group at NASA/Ames. The
file system utilizes an underlying file store to provide the file
backing, and coordinates user and system access to the files. It stores
its internal metadata in a flat file, which resides on a separate file
system. This paper will first describe our data migration system to
provide a context for DMFS, then it will describe DMFS. I also will
describe the changes to NetBSD needed to make DMFS work. Then I will
give an overview of the file archival and restoration procedures, and
describe how some typical user actions are modified by DMFS. Lastly, I
will present simple performance measurements which indicate that there
is little performance loss due to the use of the DMFS layer.
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