Genezzo::Contrib::Clustered::PrepUndo - Prepare undo file for Clustered Genezzo

    prepareUndo(gnz_home => "/dev/raw", undo_filename => "raw2");

  Creates or re-initializes undo file under GNZ_HOME.  By default
  file is named undo.und.  File header contains basic information about
  all other files in Genezzo installation.  genprepundo.pl must
  be run whenever a new file is added to the Genezzo installation.

  Undo file format is documented in Clustered.pm.

prepareUndo(gnz_home => GNZ_HOME, undo_filename => UNDO_FILENAME, number_of_processes => NUMBER_OF_PROCESSES, undo_blocks_per_process => UNDO_BLOCKS_PER_PROCESS )

gnz_home

    Supply the location for the gnz_home installation.  If 
    specified, it overrides the GNZ_HOME environment variable.

undo_filename

    Supply the name of the undo file.  If not specified, it
    defaults to undo.und for file system devices.  It must
    be specified for raw devices.

number_of_processes

    Specify the maximum number of processes supported by undo.
    If not specified defaults to 256.

undo_blocks_per_process

    Specify the number of blocks (which list fileno-blockno pairs)
    for a process.  If not specified defaults to 220.

  Eric Rollins, rollins@acm.org

  Copyright (c) 2005 Eric Rollins.  All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  any later version.




  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

  Address bug reports and comments to rollins@acm.org