Thanks for all your help. After running another backup, the size appears to
have changed very little, so it appears that it was just a strange
coincidence that the amount of extra space used by the system happened to
make the total used size equal to the number of hard links times the size of
the files of the hard links. Weird situation, but at least everything is
working correctly.
Thanks,
Aaron
On Mon, Feb 22, 2010 at 10:53 PM, Bob Proulx <b...@proulx.com> wrote:
> Aaron Barany wrote:
> > Here is the output from strace:
> > statfs("/media/Backup", {f_type="EXT2_SUPER_MAGIC", f_bsize=4096,
> > f_blocks=180268930, f_bfree=175392411, f_bavail=166235261,
> f_files=45793280,
> > f_ffree=45742365, f_fsid={460585388, 379467950}, f_namelen=255,
> > f_frsize=4096}) = 0
> > Filesystem 1K-blocks Used Available Use% Mounted on
> > /dev/sdc1 721075720 19506076 664941044 3% /media/Backup
>
> Thanks for that information. With that we can manually calculate the
> result and check against df's output.
>
>
> The statfs Size shows:
> f_bsize=4096
> f_blocks=180268930 /* total data blocks in file system */
> 4096 * 180268930 = 738381537280 Total Filesystem Size in Bytes
>
> The df Size shows 721075720 1K-blocks.
> 1024 * 721075720 = 738381537280 Total Filesystem Size in Bytes
>
>
> statfs Available shows:
> f_bsize=4096
> f_bavail=166235261 /* free blocks avail to non-superuser */
> 4096 * 166235261 = 680899629056 Available
>
> df Available shows:
> 1024 * 664941044 = 680899629056 Available
>
>
> statfs Used shows:
> f_bsize=4096
> f_bfree=175392411 /* free blocks in fs */
> 4096 * 175392411 = 718407315456 Free
> 738381537280 - 718407315456 = 19974221824 Used
>
> df Used shows:
> 1024 * 19506076 = 19974221824 Used
>
>
> Unless I missed something all of the numbers appear to match exactly
> to me. 'df' is simply reporting the values returned from the kernel's
> filesytesm statfs call. If those numbers are incorrect then it is a
> kernel problem and not a 'df' problem.
>
> Hope that helps,
> Bob
>
