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From: Michael Powell <nightrecon@hotmail.com>
Date: Wed, 22 Feb 2012 18:35:33 -0500
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Subject: Re: How much space do I need on "/" for a 7.4 to 8 stable upgrade?
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Adam Vande More wrote:

> On Wed, Feb 22, 2012 at 11:47 AM, Joe Moore
> <joe.moore@holidaycompanies.com>wrote:
> 
>>
>> I have 65MB of free space on "/". Is that going to be enough? I've
>> already moved tftpboot to /usr, cleaned out /root, /boot/kernel.old, and
>> /tmp.
>>
>> What else could I clean out if I need more space? I'm thinking some
>> executables in /rescue. "ls -l"  shows most of them being  4MB each but
>> that can't be right.
>>
> 
> I don't know the specific numbers of what you'll need but you can probably
> delete the *.symbol files(they aren't needed by default).  i386 also
> produces smaller files/mem imprint than most equivalent amd64 bins.
> 

I did this and  the only i386 box I have left uses 96MB on / while the amd64 
ones  hover around 105MB, give or take a few. 

I believe adding WITHOUT_PROFILE= true to /etc/src.conf prevents them from 
being built/installed in subsequent builds.

-Mike