idiot 5.3 disk question

[Jerry McAllister]

> 
> 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. 
> 
> Anyone have any helpful pointers to help me understand? 

Quoting    http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html

#   9.25. How is it possible for a partition to be more than 100% full?
#
# A portion of each UFS partition (8%, by default) is reserved for use by the 
# operating system and the root user. df(1) does not count that space when 
# calculating the Capacity column, so it can exceed 100%. Also, you will 
# notice that the Blocks column is always greater than the sum of the Used 
# and Avail columns, usually by a factor of 8%.

So, if you take 8% out of 74GB you will get 68GB  ( eg. 74*0.92 = 68.08)

> 
> Also, what's the ".snap/" directory for? 

Probably some snapshot of filesystem state.

////jerry

> 
> Thanks so much!
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