idiot 5.3 disk question

[Loren M. Lang]

On Wed, Dec 08, 2004 at 11:39:13PM +0000, thursday wrote:
> Greets,
> 
> I haven't been following FreeBSD much at all lately, having gotten a Linx admin job, so forgive me:
> 
> I'm installing FreeBSD 5.3 on a new machine. I've added a second disk, and 80Gig Maxtor IDE drive. I use sysinstall to partition it, and run disklabel/newfs, etc, mounting it as "/storage". 
> 
> In sysinstall, it shows the disk as being 78G - that's fine. 1024 != 1000. 
> 
> However, when I run df -h it tells me the disk's capacity is 74G, there's 4.0K in use (it's empty), but only 68G is available. I'm just confused about where the 12G went. 

Well, commands like df and du can only estimate about how much disk
space there really is used.  du may say a file is only 10 bytes, but it
probably takes up at least 1k of space.  A 900 byte file probably also
takes up 1k so it's not a multiplier, but rounding.  My favorite way to
find out how much diskspace a drive has left is to do cat /dev/zero >
/path/to/test/partition/file, then do a ls -l on the file to see how
much space it takes up.  Only do this if filling up the partiton won't
interfere with anyone or any thing else.  You can also do a df -h once
full just for kicks.  Lastly, a non-root user can only fill a partition
to 95% by default so, unless you run it as root, u'll still have 5% free
space when done.

> 
> Anyone have any helpful pointers to help me understand? 
> 
> Also, what's the ".snap/" directory for? 
> 
> Thanks so much!
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