Re: Working on Btrfs as topic for master thesis

[Hugo Mills <hugo@carfax.org.uk>]

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On Wed, Jan 22, 2014 at 01:05:33PM +0100, David Sterba wrote:
> On Sat, Jan 18, 2014 at 12:50:54PM +0000, Toggenburger Lukas wrote:
> > Hello Tomasz
> > 
> > > Have you considered per-file/per-directory selection of raid level?
> > 
> > Sounds great, I haven't thought about it before.
> > 
> > Do you or someone else know what the current state of development is?
> > Is someone working on this?
> 
> The feature lacks interface to specify the raid flags per-object. This
> is WIP, keyword is 'properties', you'll find some preliminary patches in
> the list. This is the ground work for all sorts of fancy tuning.
> 
> The filesystem split into areas with different raid levels will bring
> interesting problems regarding free space and operations that cross the
> raid levels. But I think it's doable.

   There's some potentially horrible ENOSPC cases with uneven-sized
devices. I need to run some simulations to see how it'll behave...

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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