Linux and DMAPI

[Alex Elder]

On Sun, 2010-10-03 at 02:18 -0400, Christoph Hellwig wrote:
> On Sat, Sep 18, 2010 at 09:08:16PM -0300, Diego Woitasen wrote:
> > Hi,
> >  I'm looking for software that supports DMAPI on Linux. I haven't
> > found anything on the web. I need to implement HSM for a mail server,
> > to store old messages in a secondary storage.
> > 
> >  Are there something implemented? Open source or propietary one? I
> > prefer open source obviously...
> 
> The XFS on disk format supports the required metadata for DMAPI, but the
> implementation for it never made it into the mainline Linux kernel.  For
> years SGI provided a tree to add the support, but for the last few years
> the support bitrotted heavily.  Alex promised to publush a tree with
> updated DMAPI support in the near future.

(Catching up on old mail, sorry I didn't respond earlier.)
I will keep my promise...  I have it ported to the
2.6.32-stable and 2.6.33-stable branches at this point.
I was going to try to get up-to-date with the newest
kernels first, but am now setting my sights on getting
just what I have so far published.  I will send an
announcement when it's available.
 
> You'll still need additional userspace support the to actually driver
> the migration.  The xfstests suite has a minimal implementation for QA
> purposes as free software, but I don't think that's what your looking
> for.  The main user of the XFS DMAPI support is SGI's DMF product,
> and at least a few years ago IBM's Tivoli Storage Manager also supported
> DMAPI.

As Christoph said, SGI offers DMF (Data Migration Facility),
but it is a proprietary product.

					-Alex