[ExeterLUG] Raspberry Pi Cluster Image

[Malcolm Dinsmore]

Thanks for the tip Gordon,  but even after enlarging the partition I didn't leave a massive amount of free space. So doing a cat /dev/zero didn't save much space in the compressed image.  I therefore decided to leave the original tested image on drop box.  

Thanks anyway, 

Malcolm 

-------- Original message --------
From: Gordon Henderson <gordon+lug at drogon.net> 
Date: 06/12/2013  20:58  (GMT+00:00) 
To: Exeter LUG Mailing List <exeter at mailman.lug.org.uk> 
Subject: Re: [ExeterLUG] Raspberry Pi Cluster Image 
 
On Fri, 6 Dec 2013, M Dinsmore wrote:

> Hi All,
>
> Apologies it has taken so long to get this SD card image up online, it's 
> turned out to be a busy couple of weeks for me so it took longer to get 
> the image sorted and tested.  I originally said the image would be 
> 200mb, however I realised that the amount of free space in the image was 
> quite small and enlarged the partition on my sd card and the resultant 
> image is ~500Mb compressed and I didn't want to delay it any longer to 
> investigate the reason - sorry if you're not on an unlimited broadband 
> plan.  

If you're producing a DD'able image, then one way to reduce space (if 
you've not already done something like this) is to fill the SD card up 
with zeros before compressing it:

   dd if=/dev/zero of=/var/tmp/xxx bs=1M
   rm /var/tmp/xxx

then do the dd, gzip, etc.

Gordon
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