From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: moving /gnu to different disk
Date: Wed, 13 Jan 2016 12:12:50 +0100
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	<20160112222902.GA5739@jasmine>
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In-Reply-To: <20160112222902.GA5739@jasmine> (Leo Famulari's message of "Tue,
	12 Jan 2016 17:29:02 -0500")
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To: Leo Famulari <leo@famulari.name>
Cc: help-guix@gnu.org

Leo Famulari <leo@famulari.name> skribis:

> On Tue, Jan 12, 2016 at 01:39:02PM -0800, carl hansen wrote:
>> Rather than trying the following, I thought, "Why not ask first?"
>>=20
>> Due to the sizes of various hard disks in my machine, I want to move /gnu
>> to /directoryondifferentdisk/gnu
>> and then do
>> mount --bind /directoryondifferentdisk/gnu /gnu
>>=20
>> (I have already formed a superstition that
>> ln -s /directoryondifferentdisk/gnu /gnu
>> won't work)
>>=20
>> I see a vast collection of hard links in /gnu/store/.links...
>>=20
>> I forsee problems when copying /gnu, not reproducing hard links
>> but reproducing the data.
>
> You could try moving the data with `rsync --hard-links`.

In fact you can also omit /gnu/store/.links when copying.  Nothing is
lost by doing so.  This directory simply contains a hash-to-file mapping
used by the deduplication mechanism.

However, make sure do copy /var/guix in addition to /gnu/store!
/var/guix/db/db.sqlite is the database containing meta-data for
/gnu/store, so things will break badly if it=E2=80=99s missing or out-of-sy=
nc.

HTH,
Ludo=E2=80=99.