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Man Pages


Manual Reference Pages  -  MKCODABF (1)

NAME

mkcodabf - Make a ’big file’ directory tree for Coda

CONTENTS

Synopsis

SYNOPSIS

mkcodabf [-f files-per-dir] [-s hunk-size] [-v] file new-dir

DESCRIPTION

mkcodabf will take an existing large file and produce a directory tree rooted at new-dir of much smaller files, called hunks. Each hunk, except the last hunk, will be an integral number of megabytes as controlled by the -s flag. The number of hunk files and subdirectories in each directory is controlled by the -f flag. Also, in the directory new-dir, a meta-data file, named _Coda_BigFile_, will be created so that new-dir will appear as a large, read only, regular file after being written to the Coda Distributed File System.

The reason for these ’big files’ is to allow one to write a very large file, one that is larger than the venus cache, to Coda and to be able to read it back. These are primarily expected to be some kind of media files which are written once and read many times, often in a sequential fashion by a media player. For this reason, file is expected to not be stored in the Coda file tree and new-dir is expected to be in the Coda file tree.

mkcodabf supports the following options:
-f files-per-dir
  The number of hunk files or subdirectories in each directory in the ’big file’ directory tree. The default number is 100 entries per directory.
-s hunk-size
  The size of each hunk file in megabytes. The default hunk size is one megabyte.
-v Print verbose output as each directory and file is created. The default is to quietly create the directory tree.

BUGS

Currently, only the kernel module for Windows supports ’Big Files’.

AUTHORS

o Philip A. Nelson, August 2006

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Coda Distributed File System MKCODABF (1) 11 August 2006

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