du which understands ZFS

[aurfalien]

On Aug 19, 2013, at 9:46 PM, Artem Belevich wrote:

> 
> 
> 
> On Mon, Aug 19, 2013 at 8:51 PM, aurfalien <aurfalien at gmail.com> wrote:
> Hi,
> 
> Is there a version of du which understands ZFS?
> 
> Currently when running du I get this;
> 
> I guess you meant 'df'.
> 
> Alas, the answer seems to be 'no, there's no ZFS-aware df'. The reason for that is that df gets its info via statfs(2) call and the only info it gets back is total number of blocks and available number of blocks. It's assumed that used space equals total-available. It worked well enough for other filesystems where it was filesystem that was managing disk space.
> 
> ZFS obviously violates this assumption as available space is actually property of the pool, not of the filesystem, so ZFS has to lie about total size in order to present (arguably more important) amount of used and available space in a consistent way. 
> 
> --Artem

Thanks for the reply.

There is a ZFS aware df in Illumos.  I wonder if it would be possible to port this to FreeBSD?

Unsure how it works, hell I didn't even know how df worked until you explained, still kinda don't :)

At any rate, perhaps I'll bring bring this up in the FreeBSD dev list to see what traction I get.

- aurf


> 
> 
> Filesystem                        Size    Used   Avail Capacity  Mounted on
> abyss                             51T     50k      51T     0%           /abyss
> abyss/PROJECT             72T     20T      51T    29%           /abyss/PROJECTS
> abyss/PROJECTX         54T    2.6T      51T     5%      /abyss/PROJECTSX
> 
> The zpool of abyss is 75TB in size.
> 
> - aurf
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