zfs code - Mar 2010 - dedup source code

Hello ZFS experts:

I would like to study ZFS de-duplication feature. Can someone please let me know
which directory/files I should be looking at?

Thanks in advance.
-- 
This message posted from opensolaris.org

On  2/03/10 01:44 PM, study wrote:
> Hello ZFS experts:
>
> I would like to study ZFS de-duplication feature. Can someone please let me
know which directory/files I should be looking at?
>
> Thanks in advance.

PSARC 2009/571 ZFS Deduplication Properties
PSARC/2009/557 ZFS send dedup
6677093 zfs should have dedup capability

went into build snv_128. You can see what changed by
pointing your browser at

http://hg.genunix.org/onnv-gate.hg/rev/e2081f502306

For each file that you''re interested in, you can see
it under http://src.opensolaris.org/source/xref/onnv/onnv-gate.

For example,
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/common/zfs/zfs_prop.h

The Opengrok browser on src.opensolaris.org also has a
very cool history diff function.



James C. McPherson
--
Senior Software Engineer, Solaris
Sun Microsystems
http://www.jmcp.homeunix.com/blog

On Mar 1, 2010, at 7:44 PM, study wrote:
> Hello ZFS experts:
> 
> I would like to study ZFS de-duplication feature. Can someone please let me
know which directory/files I should be looking at?
The community home page is:
http://hub.opensolaris.org/bin/view/Community+Group+zfs/

from there you should start with the docs and source code tour:
http://hub.opensolaris.org/bin/view/Community+Group+zfs/docs
http://hub.opensolaris.org/bin/view/Community+Group+zfs/source

The source tour is somewhat outdated (doesn''t contain dedup 
changes).  But it is a good starting point for figuring out how the
parts fit together.

Once you grok that, most of the dedup code is in the source files:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/ddt.c
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/ddt_zap.c

You will find the zdb -D flag useful as you explore real systems.
 -- richard

ZFS storage and performance consulting at http://www.RichardElling.com
ZFS training on deduplication, NexentaStor, and NAS performance
http://nexenta-atlanta.eventbrite.com (March 16-18, 2010)