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Date:      Sat, 7 Apr 2007 06:58:55 -0500
From:      Jim Rees <rees@umich.edu>
To:        Mike Wolman <mike@nux.co.uk>
Cc:        freebsd-fs@FreeBSD.org, freebsd-questions@freebsd.org
Subject:   Re: some thoughts about gmirror
Message-ID:  <20070407115854.GA14402@citi.umich.edu>
In-Reply-To: <20070407103057.P20396@nux.eros.office>
References:  <219395.34786.qm@web30302.mail.mud.yahoo.com> <20070407103057.P20396@nux.eros.office>

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Mike Wolman wrote:

  if you were keeping track of the blocks which had changed
  then you do not need to generate this list and simply send over the
  changed blocks.

Unison keeps a list of files at each end and only exchanges block lists for
files that have changed.  I use it to sync 40GB (10K files) over a 1Mbps
link and it's very fast.  It also will do two-way sync.



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