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From: Pete French <petefrench@ingresso.co.uk>
Date: Mon, 13 Feb 2012 09:36:12 +0000
Cc: 
Subject: Re: 9-stable from i386 to amd64
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> Do you have a spare partition? Probably use the swap partition temporarily.
> Install the 64 bits stuff into it. Boot from it and than install the 64  
> bits stuff over the (now unused) 32 bits stuff and reboot into that. If  
> something fails you can always go back to a bootable system.
> NB: disclaimer: I have never done this.

You may not, but I have, several times, and it works fine - indeed it is
how I originally moved all my 32 bit systems over to 64 bit. Doing this
remotely, as the original poster wanted, is tricky though without some
kind of iLo-style access.

-pete.