* moving /gnu to different disk
@ 2016-01-12 21:39 carl hansen
2016-01-12 22:29 ` Leo Famulari
` (3 more replies)
0 siblings, 4 replies; 8+ messages in thread
From: carl hansen @ 2016-01-12 21:39 UTC (permalink / raw)
To: help-guix
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Rather than trying the following, I thought, "Why not ask first?"
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
(I have already formed a superstition that
ln -s /directoryondifferentdisk/gnu /gnu
won't work)
I see a vast collection of hard links in /gnu/store/.links...
I forsee problems when copying /gnu, not reproducing hard links
but reproducing the data.
Are my fears founded? How to proceed?
Or better to start over with new installation of gnux and /gnu?
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: moving /gnu to different disk
2016-01-12 21:39 moving /gnu to different disk carl hansen
@ 2016-01-12 22:29 ` Leo Famulari
2016-01-13 11:12 ` Ludovic Courtès
2016-01-12 22:29 ` Andreas Enge
` (2 subsequent siblings)
3 siblings, 1 reply; 8+ messages in thread
From: Leo Famulari @ 2016-01-12 22:29 UTC (permalink / raw)
To: carl hansen; +Cc: help-guix
On Tue, Jan 12, 2016 at 01:39:02PM -0800, carl hansen wrote:
> Rather than trying the following, I thought, "Why not ask first?"
>
> 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
>
> (I have already formed a superstition that
> ln -s /directoryondifferentdisk/gnu /gnu
> won't work)
>
> I see a vast collection of hard links in /gnu/store/.links...
>
> I forsee problems when copying /gnu, not reproducing hard links
> but reproducing the data.
You could try moving the data with `rsync --hard-links`. Of course you
should test that it works as expected first or you might end up out of
space on the new device, too!
From the rsync man page:
-H, --hard-links preserve hard links
Of course, there may be a better solution altogether.
>
> Are my fears founded? How to proceed?
> Or better to start over with new installation of gnux and /gnu?
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: moving /gnu to different disk
2016-01-12 22:29 ` Leo Famulari
@ 2016-01-13 11:12 ` Ludovic Courtès
0 siblings, 0 replies; 8+ messages in thread
From: Ludovic Courtès @ 2016-01-13 11:12 UTC (permalink / raw)
To: Leo Famulari; +Cc: help-guix
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?"
>>
>> 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
>>
>> (I have already formed a superstition that
>> ln -s /directoryondifferentdisk/gnu /gnu
>> won't work)
>>
>> I see a vast collection of hard links in /gnu/store/.links...
>>
>> 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’s missing or out-of-sync.
HTH,
Ludo’.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: moving /gnu to different disk
2016-01-12 21:39 moving /gnu to different disk carl hansen
2016-01-12 22:29 ` Leo Famulari
@ 2016-01-12 22:29 ` Andreas Enge
2016-01-13 4:31 ` carl hansen
2016-01-13 11:14 ` Efraim Flashner
2016-01-13 18:06 ` Christopher Allan Webber
3 siblings, 1 reply; 8+ messages in thread
From: Andreas Enge @ 2016-01-12 22:29 UTC (permalink / raw)
To: carl hansen; +Cc: help-guix
On Tue, Jan 12, 2016 at 01:39:02PM -0800, carl hansen wrote:
> I forsee problems when copying /gnu, not reproducing hard links
> but reproducing the data.
You can use rsync with the option "-H" to preserve hard links.
I think your proposed solution with bind mounts will work, but I let
the specialists confirm.
Andreas
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: moving /gnu to different disk
2016-01-12 22:29 ` Andreas Enge
@ 2016-01-13 4:31 ` carl hansen
0 siblings, 0 replies; 8+ messages in thread
From: carl hansen @ 2016-01-13 4:31 UTC (permalink / raw)
To: Andreas Enge; +Cc: help-guix
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On Tue, Jan 12, 2016 at 2:29 PM, Andreas Enge <andreas@enge.fr> wrote:
> On Tue, Jan 12, 2016 at 01:39:02PM -0800, carl hansen wrote:
> > I forsee problems when copying /gnu, not reproducing hard links
> > but reproducing the data.
>
> You can use rsync with the option "-H" to preserve hard links.
>
> I think your proposed solution with bind mounts will work, but I let
> the specialists confirm.
>
> Andreas
>
> Thanks, Andreas and Leo, the
rsync -Hav /gnu/ /directoryondifferentdisk/gnu
rm -rf /gnu
mkdir /gnu
mount --bind /directoryondifferentdisk/gnu /gnu
seems to be working perfectly.
I hope this question and answer is put into GUIX faq somehow.
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: moving /gnu to different disk
2016-01-12 21:39 moving /gnu to different disk carl hansen
2016-01-12 22:29 ` Leo Famulari
2016-01-12 22:29 ` Andreas Enge
@ 2016-01-13 11:14 ` Efraim Flashner
2016-01-15 14:06 ` Mark H Weaver
2016-01-13 18:06 ` Christopher Allan Webber
3 siblings, 1 reply; 8+ messages in thread
From: Efraim Flashner @ 2016-01-13 11:14 UTC (permalink / raw)
To: carl hansen; +Cc: help-guix
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On Tue, 12 Jan 2016 13:39:02 -0800
carl hansen <carlhansen1234@gmail.com> wrote:
> Rather than trying the following, I thought, "Why not ask first?"
>
> 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
>
> (I have already formed a superstition that
> ln -s /directoryondifferentdisk/gnu /gnu
> won't work)
>
> I see a vast collection of hard links in /gnu/store/.links...
>
> I forsee problems when copying /gnu, not reproducing hard links
> but reproducing the data.
>
> Are my fears founded? How to proceed?
> Or better to start over with new installation of gnux and /gnu?
When I moved mine from / to a new partition I did `cp -a` and it all worked well.
--
Efraim Flashner <efraim@flashner.co.il> אפרים פלשנר
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: moving /gnu to different disk
2016-01-13 11:14 ` Efraim Flashner
@ 2016-01-15 14:06 ` Mark H Weaver
0 siblings, 0 replies; 8+ messages in thread
From: Mark H Weaver @ 2016-01-15 14:06 UTC (permalink / raw)
To: Efraim Flashner; +Cc: help-guix
Efraim Flashner <efraim@flashner.co.il> writes:
> On Tue, 12 Jan 2016 13:39:02 -0800
> carl hansen <carlhansen1234@gmail.com> wrote:
>
>> Rather than trying the following, I thought, "Why not ask first?"
>>
>> 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
>>
>> (I have already formed a superstition that
>> ln -s /directoryondifferentdisk/gnu /gnu
>> won't work)
>>
>> I see a vast collection of hard links in /gnu/store/.links...
>>
>> I forsee problems when copying /gnu, not reproducing hard links
>> but reproducing the data.
>>
>> Are my fears founded? How to proceed?
>> Or better to start over with new installation of gnux and /gnu?
>
> When I moved mine from / to a new partition I did `cp -a` and it all worked well.
Yes, and 'cp' is many times faster than rsync. On one non-trivial test,
I found that it was around 8 times faster.
Mark
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: moving /gnu to different disk
2016-01-12 21:39 moving /gnu to different disk carl hansen
` (2 preceding siblings ...)
2016-01-13 11:14 ` Efraim Flashner
@ 2016-01-13 18:06 ` Christopher Allan Webber
3 siblings, 0 replies; 8+ messages in thread
From: Christopher Allan Webber @ 2016-01-13 18:06 UTC (permalink / raw)
To: carl hansen; +Cc: help-guix
carl hansen writes:
> Rather than trying the following, I thought, "Why not ask first?"
>
> 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
>
> (I have already formed a superstition that
> ln -s /directoryondifferentdisk/gnu /gnu
> won't work)
>
> I see a vast collection of hard links in /gnu/store/.links...
>
> I forsee problems when copying /gnu, not reproducing hard links
> but reproducing the data.
>
> Are my fears founded? How to proceed?
> Or better to start over with new installation of gnux and /gnu?
On my last machine I started out with a too-small root partition, but I
was installing a lot of guix packages, so I bind-mounted /home/guix-gnu/
to /gnu/ and everything worked great.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2016-01-15 14:06 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
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2016-01-12 21:39 moving /gnu to different disk carl hansen
2016-01-12 22:29 ` Leo Famulari
2016-01-13 11:12 ` Ludovic Courtès
2016-01-12 22:29 ` Andreas Enge
2016-01-13 4:31 ` carl hansen
2016-01-13 11:14 ` Efraim Flashner
2016-01-15 14:06 ` Mark H Weaver
2016-01-13 18:06 ` Christopher Allan Webber
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