Question on migrating data between PVs in xfs

[Emmanuel Florac]

Le Thu, 11 Aug 2016 07:51:49 +1000
Dave Chinner <david at fromorbit.com> écrivait:

> On Wed, Aug 10, 2016 at 06:31:32PM +0200, Emmanuel Florac wrote:
> > Le Wed, 10 Aug 2016 20:56:39 +1000
> > Dave Chinner <david at fromorbit.com> écrivait:
> >   
> > > Have you lookd at using dm-cache instead of modifying the
> > > filesystem?
> > >   
> > 
> > Or bcache, fcache, or EnhanceIO. So far from my own testing bcache
> > is significantly faster and dm-cache by far the slowest of the
> > bunch, but bcache needs some more loving (his main developer is
> > busy writing some new tiered, caching filesystem instead).  
> 
> Yeah, the problem with bcache is that it is effectively an orphaned
> driver. If there are obvious and reproducable performance
> differentials between bcache and dm-cache, you should bring them to
> the attention of the dm developers to see if they can fix them...

Good idea. Well bcache may be orphaned of its main developer, however
others still submit quite a lot of stability patches (among them
Christoph Hellwig which is also active here IIRC).

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