[Pvfs2-users] du df mismatch, pvfs2 v1.5.1

[Robert Latham]

On Wed, Nov 15, 2006 at 03:21:52PM -0500, Michael Galloway wrote:
> good day all, i'm a bit confused with this:
> 
> [root at bioinfo ~]# df -h /pvfs2-data/
> Filesystem            Size  Used Avail Use% Mounted on
> tcp://bioinfo:3334/pvfs2-fs
>                        88G   32G   57G  36% /pvfs2-data
> 
> [root at bioinfo ~]# du -sh /pvfs2-data/
> 12K     /pvfs2-data/
> 
> there is no data in the pvfs2 filesystem and pvfs2-ping looks normal. there
> must be somthing simple i'm missing.

The issue here is that PVFS computes "df" and "du" in different ways.

Your question is kind of related to this faq entry:
http://www.pvfs.org/pvfs2-faq.html#sec:df-free-space

When figuring out 'du', the client sums up the amount of space each
directory is using.

I can gladly go into more detail if you would like.
==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B