Re: data replication how to

From: Yohann Desquerre (yohann.desquerre_at_wanadoo.fr)
Date: 07/31/04

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    Date: Sat, 31 Jul 2004 01:04:22 +0200
To: Ioannou Ioannis <iik1@hellespont.com>

    Ioannou Ioannis wrote:

    >On Thursday 29 July 2004 19:09, Yohann Desquerre wrote:
    >
    >
    >>i think i would plug the 2 storage product and the debian into the
    >>switch and then use unison to replicate the data (or do a snapshot)...
    >>
    >>
    >
    >unison is good for bidirectional replication (i.e. changes are happening in
    >both storage devices).
    >The other alternative (for unidirectional replication only) is rsync.
    >The speed depends on the size (and the H/W). Sometime rsync is faster, but I
    >think in your case unison may be better, it is amazing how fast it can check
    >huge directories for changes.
    >
    >But mind also that unison has a problem with huge directories and zillions of
    >files the first time (until the initial database is created). You have to do
    >the replication part by part at least once, and the everything is ok. What I
    >had to do in a similar situation was to use something like :
    >
    >root=/path/to/first/root
    >root=/path/to/second/root
    >
    >path=firstDir
    ># path=secondDir
    ># path=thirdDir
    ># path=fourthDir
    >
    >etc, and sync segment by segment (each somethingDir small enough so that
    >unison had no memory problems).
    >As soon the database is created and unison went through of all the files at
    >least once, you could trust it to do the job fast (depending of the H/W
    >setup, maybe faster than your time contrains)
    >
    >
    >
    >
    thanks for that i will try it ! 

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